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      "text" : "An update for xorg-x11-server-Xwayland is now available for Red Hat Enterprise Linux 9.\n\nRed Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.",
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      "text" : "Xwayland is an X server for running X clients under Wayland.\n\nSecurity Fix(es):\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch (CVE-2026-50256)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence() (CVE-2026-50257)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels (CVE-2026-50258)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing (CVE-2026-50259)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter() (CVE-2026-50260)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter() (CVE-2026-50261)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes (CVE-2026-50262)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow() (CVE-2026-50263)\n\n* xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat (CVE-2026-50264)\n\nBug Fix(es) and Enhancement(s):\n\n* [xwayland] Backport other security fixes without a CVE assigned [rhel-9.8.z] (JIRA:RHEL-184292)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
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      "text" : "A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. A mismatch between the X server and the libXfont2 library's maximum font name length can cause a stack buffer overflow during font alias resolution. The server allocates a 256 byte stack buffer but libXfont2's alias target name length is 1024 bytes. A font alias name between 257 and 1023 bytes causes the X server to copy that name into the undersized stack buffer without further checks. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
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      "category" : "summary",
      "text" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch",
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      "text" : "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, the X server allocates a 256-byte stack buffer for font alias resolution but libXfont2 permits alias target names up to 1024 bytes. A local X client requesting a font alias between 257 and 1023 bytes triggers a stack buffer overflow. Any local user who can connect to the X server display can attempt exploitation. This may crash the display server or, where the X server runs with elevated privileges, could contribute to local privilege escalation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
      "title" : "Statement"
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      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
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      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in font alias resolution due to libXfont2 name length mismatch"
  }, {
    "acknowledgments" : [ {
      "names" : [ "Anonymous" ],
      "organization" : "Trend Micro Zero Day Initiative",
      "summary" : "Acknowledged by upstream."
    } ],
    "cve" : "CVE-2026-50257",
    "cwe" : {
      "id" : "CWE-416",
      "name" : "Use After Free"
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    "discovery_date" : "2026-05-15T03:14:46+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2485382"
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      "category" : "description",
      "text" : "A use-after-free flaw was found in the X.Org X server and Xwayland in miSyncDestroyFence(). A client that sets up multiple fence triggers can trigger a use-after-free function pointer call. An attacker would connect to the X server to set up a fence and await that fence, then a second X connection destroys the fence, causing the use-after-free. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client can trigger a use-after-free function pointer call in miSyncDestroyFence() by setting up a fence trigger on one connection and destroying the fence from a second connection. Any local user who can connect to the X server display can attempt exploitation. This may crash the display server or, where the X server runs with elevated privileges, could contribute to local privilege escalation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-50257"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2485382",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485382"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-50257",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-50257"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50257",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50257"
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      "category" : "external",
      "summary" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0b",
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      "category" : "external",
      "summary" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
      "url" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html"
    }, {
      "category" : "external",
      "summary" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
      "url" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950"
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        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "HIGH",
        "integrityImpact" : "HIGH",
        "privilegesRequired" : "LOW",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
        "version" : "3.1"
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    "threats" : [ {
      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in miSyncDestroyFence()"
  }, {
    "acknowledgments" : [ {
      "names" : [ "Anonymous" ],
      "organization" : "Trend Micro Zero Day Initiative",
      "summary" : "Acknowledged by upstream."
    } ],
    "cve" : "CVE-2026-50258",
    "cwe" : {
      "id" : "CWE-121",
      "name" : "Stack-based Buffer Overflow"
    },
    "discovery_date" : "2026-05-15T03:14:46+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2485383"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. The X server has multiple stack buffers sized XkbMaxShiftLevel * XkbNumKbdGroups but CheckKeyTypes() does not verify or clamp non-canonical key types to XkbMaxShiftLevel. A client can change key types to excessive shift levels and trigger stack overflows. This is caused by an incomplete fix of CVE-2025-26597. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, CheckKeyTypes() does not clamp non-canonical keyboard types to XkbMaxShiftLevel. A local X client can set excessive shift levels and trigger stack buffer overflows in multiple code paths. This is an incomplete fix of CVE-2025-26597. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
    } ],
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    },
    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-50258"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2485383",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485383"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-50258",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-50258"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50258",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50258"
    }, {
      "category" : "external",
      "summary" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/543e108516428fc8c3bea91d6563ad266f9a801e",
      "url" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/543e108516428fc8c3bea91d6563ad266f9a801e"
    }, {
      "category" : "external",
      "summary" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
      "url" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html"
    }, {
      "category" : "external",
      "summary" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
      "url" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950"
    } ],
    "release_date" : "2026-06-02T00:00:00+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-06-17T15:13:09+00:00",
      "details" : "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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      "details" : "Important"
    } ],
    "title" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB key types due to unchecked shift levels"
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    "acknowledgments" : [ {
      "names" : [ "Anonymous" ],
      "organization" : "Trend Micro Zero Day Initiative",
      "summary" : "Acknowledged by upstream."
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    "cve" : "CVE-2026-50259",
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      "name" : "Stack-based Buffer Overflow"
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      "category" : "description",
      "text" : "A stack-based buffer overflow flaw was found in the X.Org X server and Xwayland. _XkbSetMapChecks() declares a fixed-size stack buffer mapWidths[256] indexed by key type index. The helper function CheckKeyTypes() writes to this buffer at a client-controlled offset, allowing a stack buffer overflow. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, _XkbSetMapChecks() uses a fixed 256-element stack buffer mapWidths[] indexed by a client-controlled key type index. CheckKeyTypes() writes beyond the buffer boundary, causing a stack buffer overflow. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-50259"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2485384",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485384"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-50259",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-50259"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50259",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50259"
    }, {
      "category" : "external",
      "summary" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/867b59b33bee669cb412f1314e47c52eacf6e00b",
      "url" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/867b59b33bee669cb412f1314e47c52eacf6e00b"
    }, {
      "category" : "external",
      "summary" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
      "url" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html"
    }, {
      "category" : "external",
      "summary" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
      "url" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950"
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    "title" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: stack buffer overflow in XKB SetMap request via mapWidths indexing"
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    "acknowledgments" : [ {
      "names" : [ "Anonymous" ],
      "organization" : "Trend Micro Zero Day Initiative",
      "summary" : "Acknowledged by upstream."
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      "text" : "A use-after-free flaw was found in the X.Org X server and Xwayland in FreeCounter(). A client that sets up multiple SyncCounters and awaits on those triggers can trigger a use-after-free when destroying those counters via a second client connection. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
      "title" : "Vulnerability description"
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      "category" : "summary",
      "text" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client can trigger a use-after-free in FreeCounter() by creating SyncCounters and awaiting triggers on one connection while destroying those counters from a second connection. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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      "url" : "https://access.redhat.com/security/cve/CVE-2026-50260"
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      "category" : "external",
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      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485385"
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      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-50260",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-50260"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50260",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50260"
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      "summary" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/f5abfb61994471023d8c6470428c8e30c411cc0b",
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      "summary" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
      "url" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html"
    }, {
      "category" : "external",
      "summary" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
      "url" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950"
    } ],
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      "details" : "Important"
    } ],
    "title" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in FreeCounter()"
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    "acknowledgments" : [ {
      "names" : [ "Anonymous" ],
      "organization" : "Trend Micro Zero Day Initiative",
      "summary" : "Acknowledged by upstream."
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    "cve" : "CVE-2026-50261",
    "cwe" : {
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      "name" : "Use After Free"
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    "ids" : [ {
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      "text" : "2485386"
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      "text" : "A use-after-free flaw was found in the X.Org X server and Xwayland in SyncChangeCounter(). A client that sets up multiple SyncCounters can trigger a use-after-free when destroying those counters via a second client connection while changing those counters. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client can trigger a use-after-free in SyncChangeCounter() by creating SyncCounters on one connection while changing and destroying them from a second connection. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-50261"
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      "category" : "external",
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      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485386"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-50261",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-50261"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50261",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50261"
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      "summary" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/bdd7bf57af208b1ddf57d4683d67104443b44812",
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      "category" : "external",
      "summary" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
      "url" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html"
    }, {
      "category" : "external",
      "summary" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
      "url" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950"
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      "details" : "Important"
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    "title" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free in SyncChangeCounter()"
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    "acknowledgments" : [ {
      "names" : [ "Anonymous" ],
      "organization" : "Trend Micro Zero Day Initiative",
      "summary" : "Acknowledged by upstream."
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    "cve" : "CVE-2026-50262",
    "cwe" : {
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      "name" : "Out-of-bounds Read"
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    "ids" : [ {
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      "category" : "description",
      "text" : "An out-of-bounds read flaw was found in the X.Org X server and Xwayland in __glXDisp_ChangeDrawableAttributes(). A wrong size validation check can read a client-controlled number of bytes, exceeding the request buffer, leading to information disclosure. A write path also exists but requires byte-swapped clients which is disabled by default.",
      "title" : "Vulnerability description"
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      "category" : "summary",
      "text" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat rates this issue as Moderate impact. In xorg-x11-server and xorg-x11-server-Xwayland, __glXDisp_ChangeDrawableAttributes() validates request size incorrectly, allowing a local X client to read bytes beyond the GLX request buffer—information disclosure. An out-of-bounds write path also exists but requires byte-swapped clients, which is disabled by default on Red Hat builds. Any local user who can connect to the X server display can trigger the read path. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-50262"
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      "category" : "external",
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      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485387"
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      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-50262",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-50262"
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      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50262",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50262"
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      "category" : "external",
      "summary" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/6d459e4daf715bea8abdafa8fb130be2f8a1d145",
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      "category" : "external",
      "summary" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
      "url" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html"
    }, {
      "category" : "external",
      "summary" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
      "url" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950"
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      "details" : "Moderate"
    } ],
    "title" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds read/write in GLX ChangeDrawableAttributes"
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    "acknowledgments" : [ {
      "names" : [ "Anonymous" ],
      "organization" : "Trend Micro Zero Day Initiative",
      "summary" : "Acknowledged by upstream."
    } ],
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    "cwe" : {
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      "name" : "Use After Free"
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    "discovery_date" : "2026-05-15T03:14:46+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2485388"
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      "category" : "description",
      "text" : "A use-after-free flaw was found in the X.Org X server and Xwayland in CreateSaverWindow(). A client can trigger a use-after-free read after changing window attributes and forcing the screen saver, leading to information disclosure.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat rates this issue as Moderate impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client can trigger a use-after-free read in CreateSaverWindow() by changing window attributes and forcing the screen saver, leaking server memory to the client. Any local user who can connect to the X server display can attempt exploitation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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      "summary" : "RHBZ#2485388",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485388"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-50263",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-50263"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50263",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50263"
    }, {
      "category" : "external",
      "summary" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05",
      "url" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/ecc634f1b2f7aa473d3a267eada98c4918bf9e05"
    }, {
      "category" : "external",
      "summary" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
      "url" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html"
    }, {
      "category" : "external",
      "summary" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
      "url" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950"
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    "release_date" : "2026-06-02T00:00:00+00:00",
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    "threats" : [ {
      "category" : "impact",
      "details" : "Moderate"
    } ],
    "title" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: use-after-free information disclosure in CreateSaverWindow()"
  }, {
    "acknowledgments" : [ {
      "names" : [ "Peter Hutterer" ],
      "organization" : "Red Hat",
      "summary" : "This issue was discovered by Red Hat."
    } ],
    "cve" : "CVE-2026-50264",
    "cwe" : {
      "id" : "CWE-787",
      "name" : "Out-of-bounds Write"
    },
    "discovery_date" : "2026-05-15T03:14:46+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2485389"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "An out-of-bounds write flaw was found in the X.Org X server and Xwayland in DRIGetBuffers/DRIGetBuffersWithFormat. A client that requests multiple DRI2BufferBackLeft attachments and one DRI2BufferFrontLeft can trigger an out-of-bounds heap write. This may be used to crash the server, or for privilege escalation if the X server runs as root.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "xorg-x11-server: xorg-x11-server-Xwayland: xorg-x11-server: out-of-bounds heap write in DRI2 DRIGetBuffers/DRIGetBuffersWithFormat",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "Red Hat rates this issue as Important impact. In xorg-x11-server and xorg-x11-server-Xwayland, a local X client that requests multiple DRI2BufferBackLeft attachments together with DRI2BufferFrontLeft can trigger an out-of-bounds heap write in DRIGetBuffers/DRIGetBuffersWithFormat. Any local user with X display access can trigger this. It may crash the server or, where the X server runs with elevated privileges, could contribute to local privilege escalation. Upstream fixed this in xorg-server 21.1.23 and xwayland 24.1.12.",
      "title" : "Statement"
    }, {
      "category" : "general",
      "text" : "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.",
      "title" : "CVSS score applicability"
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    "references" : [ {
      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-50264"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2485389",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2485389"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-50264",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-50264"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50264",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-50264"
    }, {
      "category" : "external",
      "summary" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e9520440ce7f",
      "url" : "https://gitlab.freedesktop.org/xorg/xserver/-/commit/339c279514326134b0878fc23ce6e9520440ce7f"
    }, {
      "category" : "external",
      "summary" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html",
      "url" : "https://lists.x.org/archives/xorg-announce/2026-June/003702.html"
    }, {
      "category" : "external",
      "summary" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950",
      "url" : "https://redhat.atlassian.net/browse/PSIRTSUPT-16950"
    } ],
    "release_date" : "2026-06-02T00:00:00+00:00",
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      "date" : "2026-06-17T15:13:09+00:00",
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        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "HIGH",
        "integrityImpact" : "HIGH",
        "privilegesRequired" : "LOW",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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}