RHSA-2026:55764: Important: kernel security, bug fix, and enhancement update

Published Aug 17, 2026
·
Updated

Important: kernel security, bug fix, and enhancement update

Other sources

The kernel packages contain the Linux kernel, the core of any Linux operating system.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

22 affected componentsFixes available
Red Hat Red Hat CodeReady Linux Builder for x86_64
Red Hat Red Hat Enterprise Linux for x86_64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for IBM z Systems
Red Hat Red Hat Enterprise Linux for Power, little endian
Red Hat Red Hat CodeReady Linux Builder for ARM 64
Red Hat Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle
Red Hat Red Hat Enterprise Linux for x86_64
Red Hat Red Hat CodeReady Linux Builder for Power, little endian
Red Hat Red Hat Enterprise Linux for ARM 64
redhat/kernel<4.18.0-553.156.1.el8_10
4.18.0-553.156.1.el8_10
redhat/bpftool<4.18.0-553.156.1.el8_10
4.18.0-553.156.1.el8_10
redhat/kernel<4.18.0-553.156.1.el8_10
4.18.0-553.156.1.el8_10
redhat/kernel-abi-stablelists<4.18.0-553.156.1.el8_10
4.18.0-553.156.1.el8_10
redhat/python3-perf-debuginfo<4.18.0-553.156.1.el8_10
4.18.0-553.156.1.el8_10
redhat/bpftool<4.18.0-553.156.1.el8_10
4.18.0-553.156.1.el8_10
redhat/bpftool<4.18.0-553.156.1.el8_10
4.18.0-553.156.1.el8_10
redhat/kernel<4.18.0-553.156.1.el8_10
4.18.0-553.156.1.el8_10
redhat/bpftool<4.18.0-553.156.1.el8_10.aa
4.18.0-553.156.1.el8_10.aa
redhat/kernel<4.18.0-553.156.1.el8_10.aa
4.18.0-553.156.1.el8_10.aa
redhat/kernel-core<4.18.0-553.156.1.el8_10.aa
4.18.0-553.156.1.el8_10.aa

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

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

    Fixed in 4.18.0-553.156.1.el8_10
  2. Upgrade

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

    Fixed in 4.18.0-553.156.1.el8_10
  3. Upgrade

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

    Fixed in 4.18.0-553.156.1.el8_10
  4. Upgrade

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

    Fixed in 4.18.0-553.156.1.el8_10
  5. Upgrade

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

    Fixed in 4.18.0-553.156.1.el8_10.aa
  6. Upgrade

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

    Fixed in 4.18.0-553.156.1.el8_10.aa
  7. Upgrade

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

    Fixed in 4.18.0-553.156.1.el8_10.aa
  8. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch JIRA:RHEL-224556
  9. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch JIRA:RHEL-189997
  10. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-17523
  11. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-53016
  12. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-53136
  13. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-53329
  14. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-64219
  15. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-63879
  16. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-53374
  17. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-43206
  18. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-63884
  19. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2025-39902
  20. Operational

    Reboot the system after applying this kernel 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-2026:55764?

The severity of RHSA-2026:55764 is high, with a score of 7.

2

What type of updates does RHSA-2026:55764 include?

RHSA-2026:55764 includes kernel security updates, bug fixes, and enhancements.

3

Which software versions are affected by RHSA-2026:55764?

RHSA-2026:55764 affects multiple versions of Red Hat Enterprise Linux and Red Hat CodeReady Linux Builder.

4

How do I fix RHSA-2026:55764?

To fix RHSA-2026:55764, apply the latest updates provided by Red Hat for the affected software.

5

When was RHSA-2026:55764 published?

RHSA-2026:55764 was published on August 17, 2026.

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