RHSA-2026:67277HighCVSS 7.8

Red Hat Security Advisory: kernel security update

Published
September 14, 2026
Last Modified
October 29, 2026

🔗 CVE IDs covered (2)

CVE-2026-64530 →CVE-2026-74480 →

📋 Description

CVE-2026-64530 — kernel: net: sched: UAF via missing handler for TC_ACT_CONSUMED in tcf_qevent_handle CVE-2026-74480 — kernel: net: bridge: stop fast-leave after deleting a port group

🎯 Affected products54

  • NVIDIA for RHEL 10
  • kernel-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-0:6.12.0-231.19.el10nv.src as a component of NVIDIA for RHEL 10
  • kernel-64k-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-core-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-core-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-debuginfo-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-devel-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-devel-matched-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-modules-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-modules-core-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debug-modules-extra-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-debuginfo-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-devel-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-devel-matched-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-modules-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-modules-core-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-64k-modules-extra-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-abi-stablelists-0:6.12.0-231.19.el10nv.noarch as a component of NVIDIA for RHEL 10
  • kernel-core-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-core-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-debuginfo-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-devel-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-devel-matched-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-modules-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-modules-core-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debug-modules-extra-0:6.12.0-231.19.el10nv.aarch64 as a component of NVIDIA for RHEL 10
  • kernel-debuginfo-0:6.12.0-231.19.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: To mitigate this issue, avoid configuring the Linux kernel's 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. Workaround: If bridge multicast snooping is not required, it can be disabled to prevent the vulnerable code path from being reached: ``` echo 0 > /sys/class/net/<bridge>/bridge/multicast_snooping ``` The br_multicast_leave_group() code path is only reachable when multicast snooping is active, so disabling it eliminates exposure to this flaw. Alternatively, 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.

🔗 References (6)