RHSA-2026:53989: Important: kernel security update

Published Aug 12, 2026
·
Updated

The kernel packages contain the Linux kernel, the core of any Linux operating system.Security Fix(es): kernel: xen/privcmd: fix double free via VMA splitting (CVE-2026-31787) kernel: fs/smb/client: fix out-of-bounds read in cifssanitizeprepath (CVE-2026-43112) kernel: md/bitmap: fix GPF in writepage caused by resize race (CVE-2026-43163) kernel: xen: AMD Zen 2 Processors: Privilege escalation via improper CPU cache isolation (CVE-2025-54518) kernel: dm log: fix out-of-bounds write due to regioncount overflow (CVE-2026-53059) 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

26 affected componentsFixes available
redhat/kernel<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/bpftool<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/bpftool-debuginfo<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-abi-stablelists<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-core<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-cross-headers<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-debug<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-debug-core<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-debug-debuginfo<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-debug-devel<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-debug-modules<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-debug-modules-extra<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-debuginfo<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-devel<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-doc<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-headers<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-modules<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-modules-extra<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-tools<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-tools-debuginfo<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/kernel-tools-libs<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/perf<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/perf-debuginfo<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/python3-perf<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.el8_6
redhat/python3-perf-debuginfo<4.18.0-372.206.1.el8_6
4.18.0-372.206.1.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 4.18.0-372.206.1.el8_6
  2. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  3. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  4. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  5. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  6. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  7. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  8. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  9. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  10. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  11. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  12. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  13. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  14. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  15. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  16. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  17. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  18. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  19. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  20. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  21. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  22. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  23. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  24. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  25. Upgrade

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

    Fixed in 4.18.0-372.206.1.el8_6
  26. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-53059
  27. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-43112
  28. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-43163
  29. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2025-54518
  30. Upgrade

    Upgrade kernel to a version that resolves this vulnerability.

    Patch CVE-2026-31787
  31. Operational

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

Event History

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

1

What is the severity of RHSA-2026:53989?

The severity of RHSA-2026:53989 is classified as Important.

2

What vulnerabilities does RHSA-2026:53989 address?

RHSA-2026:53989 addresses vulnerabilities including CVE-2026-31787 and CVE-2026-43112.

3

How do I fix RHSA-2026:53989?

To fix RHSA-2026:53989, it is recommended to update the affected kernel packages to the latest version.

4

Which software packages are affected by RHSA-2026:53989?

Affected software packages include redhat/kernel, redhat/bpftool, and related kernel packages.

5

Is it safe to use the Linux kernel with RHSA-2026:53989 vulnerabilities?

Using the Linux kernel with vulnerabilities addressed in RHSA-2026:53989 poses security risks; therefore, updating is crucial.

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