RHSA-2026:72059CriticalCVSS 7.8

Red Hat Security Advisory: kernel security update

Published
September 25, 2026
Last Modified
September 27, 2026

🔗 CVE IDs covered (3)

CVE-2025-39964 →CVE-2026-53266 →CVE-2026-74581 →

📋 Description

CVE-2025-39964 — kernel: crypto: af_alg - Disallow concurrent writes in af_alg_sendmsg CVE-2026-53266 — kernel: netfilter: ebtables SNAT target writes to shared memory pages during ARP hardware address rewrite CVE-2026-74581 — kernel: net: ipv6: use-after-free in fib6_rule_suppress due to stale res->rt6 pointer

🎯 Affected products54

  • NVIDIA for RHEL 10
  • kernel-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-0:6.12.0-231.20.el10nv.src as a component of NVIDIA for RHEL 10
  • kernel-64k-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-core-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-core-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-debuginfo-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-devel-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-devel-matched-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-modules-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-modules-core-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-modules-extra-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debuginfo-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-devel-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-devel-matched-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-modules-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-modules-core-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-modules-extra-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-abi-stablelists-0:6.12.0-231.20.el10nv.noarch as a component of NVIDIA for RHEL 10
  • kernel-core-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-core-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-debuginfo-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-devel-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-devel-matched-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-modules-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-modules-core-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-modules-extra-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debuginfo-0:6.12.0-231.20.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • +24 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 The system must be rebooted for this update to take effect. Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's 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' overall security posture. Because 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's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available. Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability. Workaround: Disable ARP hardware address rewriting in ebtables SNAT rules, or remove ebtables SNAT rules that operate on ARP traffic on bridge interfaces. Workaround: To mitigate this issue, disable the `ipv6` kernel module at boot using the kernel command-line parameter: ``` grubby --update-kernel=ALL --args="ipv6.disable=1" ``` A reboot is required for this change to take effect. To verify after reboot: ``` cat /proc/cmdline | grep -o ipv6.disable=1 sysctl net.ipv6.conf.all.disable_ipv6 ``` Applications or services that rely on the IPv6 protocol cannot use this mitigation and should prioritize applying the fix.

🔗 References (7)