RHSA-2026:55765: Important: kernel-rt security, bug fix, and enhancement update

Published Aug 17, 2026
·
Updated

Important: kernel-rt security, bug fix, and enhancement 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: mm/slub: avoid accessing metadata when pointer is invalid in objecterr() (CVE-2025-39902) kernel: drm/amdkfd: Fix out-of-bounds write in kfdeventpageset() (CVE-2026-43206) kernel: crypto: ccp - copy IV using skcipher ivsize (CVE-2026-53016) kernel: drm/amd/display: Clamp VBIOS HDMI retimer register count to array size (CVE-2026-53136) kernel: drm/amd/display: Use kreallocarray() in dalvectorreserve() (CVE-2026-53329) kernel: drm/amdgpu: zero-initialize GART table on allocation (CVE-2026-53374) kernel: drm/i915: Fix potential UAF in TTM object purge (CVE-2026-63884) kernel: drm/amdgpu: fix amdgpuhmmrangegetpages (CVE-2026-63879) kernel: drm/amd/display: Validate payload length and linkindex in dcprocessdmubauxtransferasync (CVE-2026-64219) kernel: can:bcm: arbitrary kernel code execution leading to escalate privileges (CVE-2026-17523) Bug Fix(es) and Enhancement(s): Backport "sched/deadline: Fix bandwidth reclaim equation in GRUB" to RHEL 8.10 (JIRA:RHEL-189997) vhost: reset the vring metadata cache on vring reconfiguration [rhel-8.10.z] (JIRA:RHEL-224556) 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

7 affected componentsFixes available
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for Real Time for NFV
Red Hat Red Hat Enterprise Linux for Real Time
redhat/kernel-rt-debug<4.18.0-553.156.1.rt7.497.el8_10
4.18.0-553.156.1.rt7.497.el8_10
redhat/kernel-rt-debug-devel<4.18.0-553.156.1.rt7.497.el8_10
4.18.0-553.156.1.rt7.497.el8_10
redhat/kernel-rt-debug-modules-extra<4.18.0-553.156.1.rt7.497.el8_10
4.18.0-553.156.1.rt7.497.el8_10
redhat/kernel-rt-kvm<4.18.0-553.156.1.rt7.497.el8_10
4.18.0-553.156.1.rt7.497.el8_10

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 4.18.0-553.156.1.rt7.497.el8_10
  2. Upgrade

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

    Fixed in 4.18.0-553.156.1.rt7.497.el8_10
  3. Upgrade

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

    Fixed in 4.18.0-553.156.1.rt7.497.el8_10
  4. Upgrade

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

    Fixed in 4.18.0-553.156.1.rt7.497.el8_10
  5. Upgrade

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

    Patch JIRA:RHEL-224556
  6. Upgrade

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

    Patch JIRA:RHEL-189997
  7. Upgrade

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

    Patch CVE-2025-39902
  8. Upgrade

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

    Patch CVE-2026-17523
  9. Upgrade

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

    Patch CVE-2026-53016
  10. Upgrade

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

    Patch CVE-2026-53136
  11. Upgrade

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

    Patch CVE-2026-53329
  12. Upgrade

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

    Patch CVE-2026-64219
  13. Upgrade

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

    Patch CVE-2026-63879
  14. Upgrade

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

    Patch CVE-2026-53374
  15. Upgrade

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

    Patch CVE-2026-43206
  16. Upgrade

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

    Patch CVE-2026-63884
  17. Operational

    Reboot the system after applying this kernel/kernel-rt security and bug fix update so the changes take effect.

Event History

Aug 17, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·02:44 PM
Data Sourced
via Red Hat·02:44 PM
Severity
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Frequently Asked Questions

1

What is the severity of RHSA-2026:55765?

The severity of RHSA-2026:55765 is high, rated at 7.

2

What does RHSA-2026:55765 address?

RHSA-2026:55765 addresses important security, bug fixes, and enhancements related to the kernel-rt.

3

How do I fix RHSA-2026:55765?

To fix RHSA-2026:55765, update your Red Hat Enterprise Linux systems with the latest kernel-rt packages.

4

Which software is affected by RHSA-2026:55765?

RHSA-2026:55765 affects Red Hat Enterprise Linux for x86_64 - Extended Life Cycle, and Real Time versions for NFV and general use.

5

When was RHSA-2026:55765 published?

RHSA-2026:55765 was published on August 17, 2026.

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