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      "text" : "A flaw was found in the Linux kernel's netfilter bridge ebtables SNAT (Source Network Address Translation) module. This vulnerability allows a local attacker on a system configured with specific bridge netfilter rules to improperly modify underlying memory pages during an ARP (Address Resolution Protocol) sender hardware address rewrite. This could lead to unintended system behavior, a denial of service, or potentially local privilege escalation, where an attacker gains higher access rights than intended.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "An Important flaw in the Linux kernel's ebtables SNAT target allows a local attacker to achieve privilege escalation, memory corruption, or denial of service. This vulnerability requires specific bridge netfilter rules to be configured, limiting its impact to systems with such specialized network configurations.",
      "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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      "category" : "external",
      "summary" : "https://lore.kernel.org/linux-cve-announce/2026062517-CVE-2026-53266-6162@gregkh/T/#u",
      "url" : "https://lore.kernel.org/linux-cve-announce/2026062517-CVE-2026-53266-6162@gregkh/T/#u"
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        "availabilityImpact" : "HIGH",
        "baseScore" : 7.5,
        "baseSeverity" : "HIGH",
        "confidentialityImpact" : "HIGH",
        "integrityImpact" : "HIGH",
        "privilegesRequired" : "LOW",
        "scope" : "UNCHANGED",
        "userInteraction" : "NONE",
        "vectorString" : "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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    "threats" : [ {
      "category" : "exploit_status",
      "date" : "2026-09-18T00:00:00+00:00",
      "details" : "CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog"
    }, {
      "category" : "impact",
      "details" : "Important"
    } ],
    "title" : "kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite"
  }, {
    "cve" : "CVE-2026-68121",
    "cwe" : {
      "id" : "CWE-825",
      "name" : "Expired Pointer Dereference"
    },
    "discovery_date" : "2026-08-10T12:25:51.369604+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2513233"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in the Linux kernel's PPPoE (Point-to-Point Protocol over Ethernet) implementation. This vulnerability occurs because a pointer to network packet data is not updated after memory is reallocated, leading to the use of an outdated memory address. An attacker with local access could potentially trigger this condition, causing memory corruption. This could result in a system crash (denial of service) or other unpredictable system behavior.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "kernel: pppoe: reload header pointer after dev_hard_header()",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "This vulnerability is rated as an Important severity flaw because an authenticated local user can exploit a use-after-free condition to corrupt kernel memory, potentially achieving local privilege escalation or crashing the operating system. Although triggering the issue requires specific timing during packet transmission and network device manipulation, the potential blast radius involves compromise of kernel memory. Enterprise Red Hat Enterprise Linux installations rarely configure PPPoE interfaces, which significantly limits practical exposure in default environments.",
      "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-2026-68121"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2513233",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2513233"
    }, {
      "category" : "external",
      "summary" : "RHSB-2026-011",
      "url" : "https://access.redhat.com/security/vulnerabilities/RHSB-2026-011"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-68121",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-68121"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-68121",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-68121"
    }, {
      "category" : "external",
      "summary" : "https://lore.kernel.org/linux-cve-announce/2026081056-CVE-2026-68121-b20f@gregkh/T",
      "url" : "https://lore.kernel.org/linux-cve-announce/2026081056-CVE-2026-68121-b20f@gregkh/T"
    } ],
    "release_date" : "2026-08-10T11:58:41.489000+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-10-28T18:40:07+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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    "title" : "kernel: pppoe: reload header pointer after dev_hard_header()"
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    "cve" : "CVE-2026-74480",
    "cwe" : {
      "id" : "CWE-825",
      "name" : "Expired Pointer Dereference"
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    "discovery_date" : "2026-08-15T00:00:00+00:00",
    "ids" : [ {
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      "text" : "2517046"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in the Linux kernel's network bridge module. When handling multicast fast-leave, a vulnerability exists where the system may attempt to access a port group after it has been deleted. This can occur if multicast-to-unicast was previously enabled and then disabled, leading to a stale pointer. This memory corruption vulnerability could lead to system instability or a denial of service.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "kernel: net: bridge: stop fast-leave after deleting a port group",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "If the multicast-to-unicast feature has not been explicitly enabled on any bridge port (it is disabled by default), the vulnerable code path cannot be reached. Systems that do not use Linux bridge interfaces - for example, systems that are not acting as hypervisors, container hosts, or network gateways - are not affected by this flaw.",
      "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",
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      "summary" : "RHBZ#2517046",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2517046"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-74480",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-74480"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-74480",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-74480"
    }, {
      "category" : "external",
      "summary" : "https://lore.kernel.org/linux-cve-announce/2026081536-CVE-2026-74480-e620@gregkh/T",
      "url" : "https://lore.kernel.org/linux-cve-announce/2026081536-CVE-2026-74480-e620@gregkh/T"
    } ],
    "release_date" : "2026-08-15T00:00:00+00:00",
    "remediations" : [ {
      "category" : "vendor_fix",
      "date" : "2026-10-28T18:40:07+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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      "restart_required" : {
        "category" : "none"
      },
      "url" : "https://access.redhat.com/errata/RHSA-2026:92063"
    }, {
      "category" : "workaround",
      "details" : "If bridge multicast snooping is not required, it can be disabled to prevent the vulnerable code path from being reached:\n```\necho 0 > /sys/class/net/<bridge>/bridge/multicast_snooping\n```\nThe br_multicast_leave_group() code path is only reachable when multicast snooping is active, so disabling it eliminates exposure to this flaw.\n\nAlternatively, avoid toggling multicast_to_unicast on bridge ports after it has been enabled. If multicast snooping is required, ensure that multicast_to_unicast is either left at its default (disabled) or, once enabled on a port, is not subsequently disabled while the port has active multicast group memberships.",
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        "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" : "kernel: net: bridge: stop fast-leave after deleting a port group"
  }, {
    "cve" : "CVE-2026-74582",
    "cwe" : {
      "id" : "CWE-825",
      "name" : "Expired Pointer Dereference"
    },
    "discovery_date" : "2026-08-19T10:09:54.050000+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2519475"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "An out-of-bounds write problem was observed in packet_sendmsg_spkt in net/packet/af_packet.c in the Linux Kernel. In this flaw, AF_PACKET hard_header_len race may allow local privilege escalation.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "kernel: packet: use consistent hard_header_len in non-ring send paths",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "This vulnerability is rated as an Important impact because successful exploitation allows a local user to induce kernel memory corruption, potentially leading to local privilege escalation or a complete kernel crash. Triggering the race condition requires sending raw packet data while concurrently reconfiguring a network device, which typically requires network administrative capabilities or access to unprivileged user namespaces. Because the flaw can result in arbitrary kernel write operations from local space, it is assessed at a higher severity despite the race window and capability prerequisites.",
      "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-2026-74582"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2519475",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2519475"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-74582",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-74582"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-74582",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-74582"
    }, {
      "category" : "external",
      "summary" : "https://lore.kernel.org/linux-cve-announce/2026082100-CVE-2026-74582-3296@gregkh/T",
      "url" : "https://lore.kernel.org/linux-cve-announce/2026082100-CVE-2026-74582-3296@gregkh/T"
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      "date" : "2026-10-28T18:40:07+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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    "title" : "kernel: packet: use consistent hard_header_len in non-ring send paths"
  }, {
    "cve" : "CVE-2026-80844",
    "cwe" : {
      "id" : "CWE-805",
      "name" : "Buffer Access with Incorrect Length Value"
    },
    "discovery_date" : "2026-09-04T00:00:00+00:00",
    "ids" : [ {
      "system_name" : "Red Hat Bugzilla ID",
      "text" : "2528676"
    } ],
    "notes" : [ {
      "category" : "description",
      "text" : "A flaw was found in the Linux kernel's xfrm subsystem, specifically within the AH6 (Authentication Header for IPv6) module. The `ipv6_rearrange_rthdr()` function does not properly validate the `segments_left` field in routing headers when processing raw IPv6 HDRINCL packets. This oversight allows an attacker to craft a malicious packet that can cause an out-of-bounds memory access, potentially leading to memory corruption.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "kernel: xfrm: ah6: validate routing header segments_left",
      "title" : "Vulnerability summary"
    }, {
      "category" : "other",
      "text" : "This issue is classified as Important severity because exploitation can be achieved by a local attacker with unprivileged user access. An attack could leverage user namespaces to obtain elevated network permissions within the namespace, then sends specially crafted IPv6 packets with malformed Authentication Header routing headers. Exploitation is challenging but achievable due to complex setup including IPv6 AH/XFRM, ESP-in-UDP encapsulation, and specific timing and memory layout conditions. This memory corruption can enable local privilege escalation to root from an unprivileged user account.",
      "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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      "category" : "self",
      "summary" : "Canonical URL",
      "url" : "https://access.redhat.com/security/cve/CVE-2026-80844"
    }, {
      "category" : "external",
      "summary" : "RHBZ#2528676",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2528676"
    }, {
      "category" : "external",
      "summary" : "RHSB-2026-011",
      "url" : "https://access.redhat.com/security/vulnerabilities/RHSB-2026-011"
    }, {
      "category" : "external",
      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-80844",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-80844"
    }, {
      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-80844",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-80844"
    }, {
      "category" : "external",
      "summary" : "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80844.mbox",
      "url" : "https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-80844.mbox"
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      "date" : "2026-10-28T18:40:07+00:00",
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        "confidentialityImpact" : "HIGH",
        "integrityImpact" : "LOW",
        "privilegesRequired" : "LOW",
        "scope" : "UNCHANGED",
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      "details" : "Important"
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    "title" : "kernel: xfrm: ah6: validate routing header segments_left"
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}