RHSA-2026:60438: Important: kernel-rt security update

Published Aug 27, 2026
·
Updated

Important: kernel-rt security update

Other sources

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: net: ipv6: use-after-free in fib6rulesuppress due to stale res->rt6 pointer (CVE-2026-74581) 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

19 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
redhat/kernel-rt<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-core<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-debug<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-debug-core<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-debug-debuginfo<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-debug-devel<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-debug-kvm<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-debug-modules<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-debug-modules-core<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-debug-modules-extra<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-debuginfo<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-devel<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-kvm<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-modules<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-modules-core<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2
redhat/kernel-rt-modules-extra<5.14.0-284.189.1.rt14.474.el9_2
5.14.0-284.189.1.rt14.474.el9_2

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  2. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  3. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  4. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  5. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  6. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  7. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  8. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  9. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  10. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  11. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  12. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  13. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  14. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  15. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2
  16. Upgrade

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

    Fixed in 5.14.0-284.189.1.rt14.474.el9_2

Event History

Aug 27, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·07:34 AM
Data Sourced
via Red Hat·07:34 AM
Severity

Frequently Asked Questions

1

Which systems are covered by this update?

The advisory applies to Red Hat kernel-rt packages, including kernel-rt-core and kernel-rt-debug variants, for Red Hat Enterprise Linux x86_64 Update Services for SAP Solutions and Extended Life Cycle offerings.

2

What vulnerability class is addressed?

The update fixes CVE-2026-74581, a use-after-free issue in the IPv6 networking code involving fib6_rule_suppress and a stale res->rt6 pointer.

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