RHSA-2026:55443: Important: kernel-rt security update

Published Aug 17, 2026
·
Updated

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/sched: actapi: use RCU with deferred freeing for action lifecycle (CVE-2026-53264) 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.

Affected Software

17 affected componentsFixes available
redhat/kernel-rt<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-core<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-debug<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-debug-core<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-debug-debuginfo<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-debug-devel<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-debug-kvm<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-debug-modules<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-debug-modules-core<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-debug-modules-extra<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-debuginfo<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-devel<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-kvm<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-modules<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-modules-core<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.el9_2
redhat/kernel-rt-modules-extra<5.14.0-284.187.1.rt14.472.el9_2
5.14.0-284.187.1.rt14.472.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 5.14.0-284.187.1.rt14.472.el9_2
  2. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  3. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  4. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  5. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  6. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  7. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  8. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  9. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  10. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  11. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  12. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  13. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  14. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  15. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  16. Upgrade

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

    Fixed in 5.14.0-284.187.1.rt14.472.el9_2
  17. Upgrade

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

    Patch CVE-2026-53264
  18. Operational

    Reboot the system after applying the kernel-rt update so the update takes effect.

Event History

Aug 17, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Free Weekly Intel

Don't miss critical vulnerabilities

Join thousands of security professionals who receive our weekly digest of trending CVEs, zero-days, and exploited vulnerabilities.

No spam. Unsubscribe anytime.

Frequently Asked Questions

1

What is the severity of RHSA-2026:55443?

The severity of RHSA-2026:55443 is classified as important.

2

How do I fix RHSA-2026:55443?

To fix RHSA-2026:55443, update the affected kernel-rt packages to the latest version provided by Red Hat.

3

What security issue does RHSA-2026:55443 address?

RHSA-2026:55443 addresses a security issue in the kernel related to the use of RCU with deferred freeing for action lifecycle, identified as CVE-2026-53264.

4

Which packages are affected by RHSA-2026:55443?

The affected packages include redhat/kernel-rt, redhat/kernel-rt-core, redhat/kernel-rt-debug, and several others related to kernel-rt.

5

When was RHSA-2026:55443 published?

RHSA-2026:55443 was published on August 17, 2026.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203