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      "category" : "summary",
      "text" : "An update for kernel-rt is now available for Red Hat Enterprise Linux 8.\n\nRed Hat Product Security has rated this update as having a security impact\nof Important. A Common Vulnerability Scoring System (CVSS) base score, which\ngives a detailed severity rating, is available for each vulnerability from\nthe CVE link(s) in the References section.",
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      "text" : "The kernel-rt packages provide the Real Time Linux Kernel, which enables\nfine-tuning for systems with extremely high determinism requirements.\n\nSecurity Fix(es):\n\n* kernel: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)\n\n* kernel: xfrm single-frag length not properly limited\n\n* kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)\n\n* kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)",
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      "text" : "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.",
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      "url" : "https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_45116.json"
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      "text" : "kernel: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O",
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      "text" : "KVM x86 was re-checking L1 instruction intercepts while completing a userspace I/O emulation for an L2 instruction. If L1 (or host userspace) modified I/O interception during the exit, KVM could wrongly treat the already-emulated I/O as intercepted and leave vcpu->arch.pio.count non-zero, triggering a WARN and potentially disrupting the guest.\nPractical exploitation requires local access to /dev/kvm and the ability to run nested virtualization or manipulate I/O bitmaps.",
      "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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      "url" : "https://lore.kernel.org/linux-cve-announce/2025102841-CVE-2025-40026-760b@gregkh/T"
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      "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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O"
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    "cve" : "CVE-2026-52993",
    "cwe" : {
      "id" : "CWE-763",
      "name" : "Release of Invalid Pointer or Reference"
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      "category" : "description",
      "text" : "A flaw was found in the Linux kernel's Transparent Inter-Process Communication (TIPC) module. This vulnerability, a double-free, occurs when the `tipc_buf_append()` function incorrectly handles memory after a socket buffer (skb) reallocation. An attacker could potentially exploit this to cause system instability or a denial of service. In some scenarios, this type of memory corruption could also lead to arbitrary code execution.",
      "title" : "Vulnerability description"
    }, {
      "category" : "summary",
      "text" : "kernel: tipc: fix double-free in tipc_buf_append()",
      "title" : "Vulnerability summary"
    }, {
      "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-2026-52993"
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      "summary" : "RHBZ#2492437",
      "url" : "https://bugzilla.redhat.com/show_bug.cgi?id=2492437"
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      "summary" : "https://www.cve.org/CVERecord?id=CVE-2026-52993",
      "url" : "https://www.cve.org/CVERecord?id=CVE-2026-52993"
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      "category" : "external",
      "summary" : "https://nvd.nist.gov/vuln/detail/CVE-2026-52993",
      "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-52993"
    }, {
      "category" : "external",
      "summary" : "https://lore.kernel.org/linux-cve-announce/2026062445-CVE-2026-52993-34a2@gregkh/T",
      "url" : "https://lore.kernel.org/linux-cve-announce/2026062445-CVE-2026-52993-34a2@gregkh/T"
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      "text" : "A flaw was found in KVM in the Linux kernel. This vulnerability occurs due to improper validation of memory management unit (MMU) page roots after these pages are made available. An attacker could exploit this by triggering a scenario where KVM attempts to map memory into an invalid root, causing child shadow pages to inherit an invalid state. This violates KVM's internal integrity rules, potentially leading to system instability or a denial of service within the virtualized environment.",
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      "title" : "Vulnerability summary"
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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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      "summary" : "https://lore.kernel.org/linux-cve-announce/2026080401-CVE-2026-64561-d0d4@gregkh/T",
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