RHSA-2026:61973: Important: kernel security update

Published Sep 1, 2026
·
Updated

Important: kernel security update

Other sources

The kernel packages contain the Linux kernel, the core of any Linux operating system.Security Fix(es): kernel: net: bridge: stop fast-leave after deleting a port group (CVE-2026-74480) 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.

— Red Hat

Affected Software

28 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life
Red Hat Red Hat Enterprise Linux Server - AUS
redhat/kernel<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/bpftool<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/bpftool-debuginfo<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-abi-stablelists<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-core<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-cross-headers<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-debug<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-debug-core<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-debug-debuginfo<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-debug-devel<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-debug-modules<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-debug-modules-extra<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-debuginfo<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-devel<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-doc<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-headers<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-modules<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-modules-extra<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-tools<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-tools-debuginfo<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/kernel-tools-libs<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/perf<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/perf-debuginfo<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/python3-perf<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6
redhat/python3-perf-debuginfo<4.18.0-372.211.1.el8_6
4.18.0-372.211.1.el8_6

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade redhat/kernel to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  2. Upgrade

    Upgrade redhat/bpftool to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  3. Upgrade

    Upgrade redhat/bpftool-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  4. Upgrade

    Upgrade redhat/kernel-abi-stablelists to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  5. Upgrade

    Upgrade redhat/kernel-core to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  6. Upgrade

    Upgrade redhat/kernel-cross-headers to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  7. Upgrade

    Upgrade redhat/kernel-debug to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  8. Upgrade

    Upgrade redhat/kernel-debug-core to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  9. Upgrade

    Upgrade redhat/kernel-debug-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  10. Upgrade

    Upgrade redhat/kernel-debug-devel to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  11. Upgrade

    Upgrade redhat/kernel-debug-modules to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  12. Upgrade

    Upgrade redhat/kernel-debug-modules-extra to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  13. Upgrade

    Upgrade redhat/kernel-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  14. Upgrade

    Upgrade redhat/kernel-devel to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  15. Upgrade

    Upgrade redhat/kernel-doc to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  16. Upgrade

    Upgrade redhat/kernel-headers to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  17. Upgrade

    Upgrade redhat/kernel-modules to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  18. Upgrade

    Upgrade redhat/kernel-modules-extra to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  19. Upgrade

    Upgrade redhat/kernel-tools to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  20. Upgrade

    Upgrade redhat/kernel-tools-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  21. Upgrade

    Upgrade redhat/kernel-tools-libs to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  22. Upgrade

    Upgrade redhat/perf to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  23. Upgrade

    Upgrade redhat/perf-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  24. Upgrade

    Upgrade redhat/python3-perf to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  25. Upgrade

    Upgrade redhat/python3-perf-debuginfo to a version that resolves this vulnerability.

    Fixed in 4.18.0-372.211.1.el8_6
  26. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-74480
  27. Operational

    Reboot the system after applying the kernel security update so the update takes effect.

Event History

Sep 1, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·10:39 AM
Data Sourced
via Red Hat·10:39 AM
Severity

Frequently Asked Questions

1

Which systems should be prioritized for this update?

Red Hat Enterprise Linux x86_64 systems using the affected kernel packages should be prioritized, including systems on Extended Life Cycle Long Life and Server AUS offerings. The advisory also lists related kernel components such as kernel-core, bpftool, and kernel-abi-stablelists.

2

What vulnerability is addressed by this advisory?

The update fixes CVE-2026-74480 in the Linux kernel bridge networking code. The issue concerns fast-leave behavior after a bridge port group is deleted.

3

Is there enough information here to determine exploit prerequisites or a workaround?

No. The provided advisory data does not specify attacker access requirements, affected default configurations, exploit conditions, detection methods, or mitigations other than applying the kernel security update.

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