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        "text": "An update for kernel is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.\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": "The kernel packages contain the Linux kernel, the core of any Linux operating system.\n\nSecurity Fix(es):\n\n* kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete (CVE-2026-46116)\n\n* kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN (CVE-2026-46113)\n\n* kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources (CVE-2025-10263)\n\n* kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role (CVE-2026-53359)\n\n* kernel: net/sched: cls_api: Handle TC_ACT_CONSUMED in tcf_qevent_handle (CVE-2026-64530)\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": "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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          "text": "A flaw was found in the Linux kernel on ARM processors. A race condition in Translation Lookaside Buffer Invalidation (TLBI) operations during memory permission changes allows a local attacker to write to memory resources owned by higher privilege levels. This could allow an unprivileged local attacker to gain kernel privileges or a guest VM to escape to the hypervisor, resulting in complete system compromise.",
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          "text": "kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources",
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          "text": "This is an Important flaw in the Linux kernel on ARM processors, allowing a local unprivileged attacker to achieve privilege escalation to kernel level or a guest virtual machine to escape to the hypervisor. The vulnerability stems from a race condition during Translation Lookaside Buffer Invalidation (TLBI) operations when memory permissions are altered, enabling writes to higher exception level resources.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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        {
          "category": "impact",
          "details": "Important"
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      "title": "kernel: Arm Processors: Privilege escalation or information disclosure via writes to higher exception level resources"
    },
    {
      "cve": "CVE-2026-46113",
      "cwe": {
        "id": "CWE-416",
        "name": "Use After Free"
      },
      "discovery_date": "2026-05-28T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2482587"
        }
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s KVM (Kernel-based Virtual Machine) x86 shadow paging mechanism. This use-after-free vulnerability arises from incorrect handling of Guest Frame Numbers (GFNs) when guest page tables are modified. A local attacker with control over a guest virtual machine could exploit this to dereference freed memory, potentially leading to information disclosure, privilege escalation, or a denial of service (DoS).",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The attack vector is from the guest to the host if KVM being used (and Shadow paging being used). KVM x86 shadow paging can leave a stale rmap entry when a direct shadow page is reused with an unexpected GFN after guest page table changes between VM entries. Later memslot deletion, dirty logging, or MMU notifier invalidation can walk the stale rmap and dereference a freed kvm_mmu_page, resulting in a use-after-free in the host kernel. For the CVSS the PR:L is used because a local actor with access to KVM or control of a guest execution context can influence the guest mappings and related memory management operations. The issue is not a normal network reachable bug, but it can cross the guest to host boundary in virtualized deployments. Impact is at least host denial of service and in the paranoid score may include confidentiality and integrity impact due to a plausible UAF based memory corruption primitive.\nFor the paranoid score, choose the highest still-defensible interpretation supported by the bug class and patch context, with preference for manual-review sensitivity over autoclosed false negat\nives.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s 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-2026-46113"
        },
        {
          "category": "external",
          "summary": "RHBZ#2482587",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482587"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-46113",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-46113"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-46113",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46113"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026052813-CVE-2026-46113-f083@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026052813-CVE-2026-46113-f083@gregkh/T"
        }
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      "release_date": "2026-05-28T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-31T13:20:01+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\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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      "title": "kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected GFN"
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    {
      "cve": "CVE-2026-46116",
      "cwe": {
        "id": "CWE-763",
        "name": "Release of Invalid Pointer or Reference"
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      "discovery_date": "2026-05-28T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2482523"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s `xfrm` (IPSec framework) subsystem. This vulnerability, a use-after-free, occurs when the system incorrectly manages memory related to security policies, specifically during the deletion of `xfrm_state` lists. An attacker with local access could exploit this flaw by triggering specific operations, leading to memory corruption. This could cause the system to become unstable, resulting in crashes or a Denial of Service (DoS), and potentially allow for unauthorized access to sensitive information or increased privileges.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete",
          "title": "Vulnerability summary"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s 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-2026-46116"
        },
        {
          "category": "external",
          "summary": "RHBZ#2482523",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2482523"
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-46116",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-46116"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-46116",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46116"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026052814-CVE-2026-46116-73b8@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026052814-CVE-2026-46116-73b8@gregkh/T"
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      "release_date": "2026-05-28T00:00:00+00:00",
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          "date": "2026-07-31T13:20:01+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\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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      "title": "kernel: xfrm: defensively unhash xfrm_state lists in __xfrm_state_delete"
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    {
      "cve": "CVE-2026-53359",
      "cwe": {
        "id": "CWE-825",
        "name": "Expired Pointer Dereference"
      },
      "discovery_date": "2026-07-04T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2497033"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s Kernel-based Virtual Machine (KVM) x86 shadow paging mechanism. This vulnerability occurs when a host page directory entry (PDE) mapping is changed from within the guest, leading to an unexpected role mismatch in shadow paging. This mismatch can cause a use-after-free condition, where the system attempts to access memory that has already been released. Such a condition can lead to system instability, denial of service, potentially the execution of arbitrary code or guest-to-host escape.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This is an Important flaw in the KVM x86 shadow paging mechanism where an attacker with privileged access inside the guest VM could trigger a use-after-free condition by manipulating page directory entries on the host. This could lead to system instability, denial of service, or potentially arbitrary code execution on the host.\n\nIn Red Hat Enterprise Linux 7, nested virtualization for KVM is a Technology Preview feature and the nested parameter defaults to 0 (disabled) for both kvm_intel and kvm_amd.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s 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-2026-53359"
        },
        {
          "category": "external",
          "summary": "RHBZ#2497033",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2497033"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-53359",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-53359"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-53359",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-53359"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026070403-CVE-2026-53359-4f57@gregkh/T",
          "url": "https://lore.kernel.org/linux-cve-announce/2026070403-CVE-2026-53359-4f57@gregkh/T"
        },
        {
          "category": "external",
          "summary": "https://www.openwall.com/lists/oss-security/2026/07/06/7",
          "url": "https://www.openwall.com/lists/oss-security/2026/07/06/7"
        }
      ],
      "release_date": "2026-07-04T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-31T13:20:01+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\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H",
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          "category": "impact",
          "details": "Important"
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      "title": "kernel: KVM: x86: Fix shadow paging use-after-free due to unexpected role"
    },
    {
      "cve": "CVE-2026-64530",
      "cwe": {
        "id": "CWE-431",
        "name": "Missing Handler"
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      "discovery_date": "2026-07-21T19:12:58.596000+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2504052"
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      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in the Linux kernel\u0027s traffic control (TC) classifier application programming interface (API). The `tcf_qevent_handle` function does not properly handle a consumed socket buffer (`skb`) when it is processed by the defragmentation engine. This can lead to a Use-After-Free (UAF) vulnerability, where the system attempts to use memory that has already been freed. An attacker could potentially exploit this to cause system instability or execute arbitrary code.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This Important flaw in the Linux kernel\u0027s networking scheduler can lead to a use-after-free vulnerability. Exploitation requires a local attacker to configure specific `tc qdisc` and `tc filter` rules involving RED qdisc with early drop events and connection tracking on fragmented network traffic. This non-default configuration limits the attack surface, but successful exploitation could lead to privilege escalation or a denial of service.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s 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-2026-64530"
        },
        {
          "category": "external",
          "summary": "RHBZ#2504052",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2504052"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-64530",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-64530"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-64530",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64530"
        },
        {
          "category": "external",
          "summary": "https://lore.kernel.org/linux-cve-announce/2026072624-CVE-2026-64530-52e9@gregkh/T/#u",
          "url": "https://lore.kernel.org/linux-cve-announce/2026072624-CVE-2026-64530-52e9@gregkh/T/#u"
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      "release_date": "2026-06-23T23:59:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-07-31T13:20:01+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\n\nThe system must be rebooted for this update to take effect.\n\nRed Hat recommends treating all kernel errata as security-relevant. Given the kernel\u0027s fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers\u0027 overall security posture.\n\nBecause of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat\u0027s CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.",
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          "url": "https://access.redhat.com/errata/RHSA-2026:49033"
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          "details": "To mitigate this issue, avoid configuring the Linux kernel\u0027s traffic control (tc) subsystem with the RED queue discipline (`red`) that includes `qevent early_drop` and an `action ct` filter on interfaces processing fragmented UDP streams. This specific configuration is required to trigger the use-after-free vulnerability.",
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            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "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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          "category": "impact",
          "details": "Important"
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      "title": "kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle"
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}