RHSA-2026:71606

Vulnerability from csaf_redhat - Published: 2026-09-24 13:07 - Updated: 2026-09-25 10:22
Summary
Red Hat Security Advisory: kernel-rt security update
Severity
Important
Notes
Topic: An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions. Red 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.
Details: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Security Fix(es): * kernel: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg (CVE-2025-39964) * kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite (CVE-2026-53266) * kernel: Linux kernel: PPPoE memory corruption via stale pointer (CVE-2026-68121) * kernel: sctp: prevent peer transport count overflow (CVE-2026-74469) * kernel: xfrm: ah6: validate routing header segments_left (CVE-2026-80844) * kernel: net: tun: bound receive headroom (CVE-2026-81000) For 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.
Terms of Use: 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.
CVE-2025-39964

A race condition was found in the Linux kernel cryptographic user API, AF_ALG in the way concurrent writes to the same AF_ALG socket are handled. Interleaved data and inconsistent internal socket state may result. A local user could use this flaw to crash the system or corrupt cryptographic operation results, causing a denial of service or data integrity issues.

7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CWE-366 - Race Condition within a Thread
Affected products
Product Identifier Version Remediation
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2.src —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-devel-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-kvm-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-modules-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-modules-core-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debug-modules-extra-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debuginfo-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-devel-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-kvm-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-modules-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-modules-core-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: NFV-9.2.0.Z.E4S:kernel-rt-modules-extra-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2.src —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-core-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-core-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-debuginfo-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-devel-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-modules-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-modules-core-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debug-modules-extra-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debuginfo-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-debuginfo-common-x86_64-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-devel-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-modules-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-modules-core-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Unresolved product id: RT-9.2.0.Z.E4S:kernel-rt-modules-extra-0:5.14.0-284.194.1.rt14.479.el9_2.x86_64 —
Vendor Fix fix
Workaround
Threats
Exploit Status CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Impact Moderate
CVE-2026-53266

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.

7.5 (High)
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 34 products, the same list as for CVE-2025-39964
Threats
Exploit Status CISA: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Impact Important
CVE-2026-68121

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.

7.3 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CWE-825 - Expired Pointer Dereference
Affected products
Fixed 34 products, the same list as for CVE-2025-39964
Threats
Impact Important
CVE-2026-74469

A flaw was found in the Stream Control Transmission Protocol (SCTP) implementation within the Linux kernel. An integer overflow occurs when the `transport_count` for an association exceeds its 16-bit limit, causing it to wrap around to zero. This allows a diagnostic dump to write 8 MiB of peer addresses beyond the intended memory buffer, leading to an out-of-bounds write. This memory corruption can result in a denial of service (DoS) due to system instability or crashes.

8.3 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CWE-787 - Out-of-bounds Write
Affected products
Fixed 34 products, the same list as for CVE-2025-39964
Threats
Impact Important
CVE-2026-80844

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.

8.3 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H
CWE-805 - Buffer Access with Incorrect Length Value
Affected products
Fixed 34 products, the same list as for CVE-2025-39964
Threats
Impact Important
CVE-2026-81000

A flaw was found in the Linux kernel's TUN/TAP driver. An integer underflow vulnerability exists in the tun_get_user() function when processing oversized headroom requests. This can occur if Open vSwitch (OVS) propagates an excessively large headroom request to the TUN or TAP device. Successful exploitation could lead to memory corruption, where network packet data is written outside its intended buffer, potentially causing a denial of service or other system instability.

7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE-787 - Out-of-bounds Write
Affected products
Fixed 34 products, the same list as for CVE-2025-39964
Threats
Impact Important
References
URL Category
https://access.redhat.com/errata/RHSA-2026:71606 self
https://access.redhat.com/security/updates/classi… external
https://bugzilla.redhat.com/show_bug.cgi?id=2403545 external
https://bugzilla.redhat.com/show_bug.cgi?id=2485368 external
https://bugzilla.redhat.com/show_bug.cgi?id=2513233 external
https://bugzilla.redhat.com/show_bug.cgi?id=2517043 external
https://bugzilla.redhat.com/show_bug.cgi?id=2528676 external
https://bugzilla.redhat.com/show_bug.cgi?id=2532176 external
https://security.access.redhat.com/data/csaf/v2/a… self
https://access.redhat.com/security/cve/CVE-2025-39964 self
https://bugzilla.redhat.com/show_bug.cgi?id=2403545 external
https://www.cve.org/CVERecord?id=CVE-2025-39964 external
https://nvd.nist.gov/vuln/detail/CVE-2025-39964 external
https://lore.kernel.org/linux-cve-announce/202510… external
https://www.cisa.gov/known-exploited-vulnerabilit… external
https://access.redhat.com/security/cve/CVE-2026-53266 self
https://bugzilla.redhat.com/show_bug.cgi?id=2485368 external
https://www.cve.org/CVERecord?id=CVE-2026-53266 external
https://nvd.nist.gov/vuln/detail/CVE-2026-53266 external
https://lore.kernel.org/linux-cve-announce/202606… external
https://access.redhat.com/security/cve/CVE-2026-68121 self
https://bugzilla.redhat.com/show_bug.cgi?id=2513233 external
https://access.redhat.com/security/vulnerabilitie… external
https://www.cve.org/CVERecord?id=CVE-2026-68121 external
https://nvd.nist.gov/vuln/detail/CVE-2026-68121 external
https://lore.kernel.org/linux-cve-announce/202608… external
https://access.redhat.com/security/cve/CVE-2026-74469 self
https://bugzilla.redhat.com/show_bug.cgi?id=2517043 external
https://www.cve.org/CVERecord?id=CVE-2026-74469 external
https://nvd.nist.gov/vuln/detail/CVE-2026-74469 external
https://lore.kernel.org/linux-cve-announce/202608… external
https://access.redhat.com/security/cve/CVE-2026-80844 self
https://bugzilla.redhat.com/show_bug.cgi?id=2528676 external
https://www.cve.org/CVERecord?id=CVE-2026-80844 external
https://nvd.nist.gov/vuln/detail/CVE-2026-80844 external
https://git.kernel.org/pub/scm/linux/security/vul… external
https://access.redhat.com/security/cve/CVE-2026-81000 self
https://bugzilla.redhat.com/show_bug.cgi?id=2532176 external
https://www.cve.org/CVERecord?id=CVE-2026-81000 external
https://nvd.nist.gov/vuln/detail/CVE-2026-81000 external
https://git.kernel.org/pub/scm/linux/security/vul… external
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          "url": "https://access.redhat.com/security/cve/CVE-2026-74469"
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          "summary": "RHBZ#2517043",
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        "name": "Buffer Access with Incorrect Length Value"
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      "ids": [
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          "text": "A flaw was found in the Linux kernel\u0027s 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"
        },
        {
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          "text": "kernel: xfrm: ah6: validate routing header segments_left",
          "title": "Vulnerability summary"
        },
        {
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          "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"
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        {
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          "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": "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"
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          "summary": "RHSB-2026-011",
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          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2026-80844",
          "url": "https://www.cve.org/CVERecord?id=CVE-2026-80844"
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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-80844",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80844"
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          "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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        "id": "CWE-787",
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          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "kernel: net: tun: bound receive headroom",
          "title": "Vulnerability summary"
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        {
          "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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        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "kernel: net: tun: bound receive headroom"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.