RHSA-2026:59663: Important: kernel-rt security, bug fix, and enhancement update

Published Aug 26, 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: net: atm: fix crash due to unvalidated vcc pointer in sigdsend() (CVE-2026-31411) kernel: fs/smb/client: fix out-of-bounds read in cifssanitizeprepath (CVE-2026-43112) kernel: net: ipv6: fix NOREF dst use in seg6 and rpl lwtunnels (CVE-2026-46099) kernel: dm log: fix out-of-bounds write due to regioncount overflow (CVE-2026-53059) Bug Fix(es) and Enhancement(s): [RHEL 9] Bonding reports unknown speed/duplex for tg3 interface (JIRA:RHEL-182765) vhost: reset the vring metadata cache on vring reconfiguration (JIRA:RHEL-224546) 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<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-core<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-debug<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-debug-core<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-debug-debuginfo<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-debug-devel<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-debug-kvm<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-debug-modules<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-debug-modules-core<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-debug-modules-extra<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-debuginfo<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-devel<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-kvm<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-modules<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-modules-core<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.el9_2
redhat/kernel-rt-modules-extra<5.14.0-284.188.1.rt14.473.el9_2
5.14.0-284.188.1.rt14.473.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 5.14.0-284.188.1.rt14.473.el9_2
  2. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  3. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  4. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  5. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  6. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  7. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  8. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  9. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  10. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  11. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  12. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  13. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  14. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  15. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  16. Upgrade

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

    Fixed in 5.14.0-284.188.1.rt14.473.el9_2
  17. Upgrade

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

    Patch CVE-2026-53059
  18. Upgrade

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

    Patch CVE-2026-43112
  19. Upgrade

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

    Patch CVE-2026-46099
  20. Upgrade

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

    Patch CVE-2026-31411
  21. Configuration

    Reset the vring metadata cache on vring reconfiguration (JIRA:RHEL-224546).

    vhost vring metadata cache = reset on vring reconfiguration
  22. Operational

    Reboot the system to ensure the kernel-rt update takes effect.

Event History

Aug 26, 2026
Advisory Published
via Red Hat·12:00 AM
Data Sourced
via Red Hat·12:00 AM
RemedyDescriptionAffected Software
Advisory Published
via Red Hat·12:06 AM
Data Sourced
via Red Hat·12:06 AM
Severity

Frequently Asked Questions

1

Which systems should prioritize this update?

Systems running the Red Hat kernel-rt packages should prioritize it, especially Real Time Linux deployments used for workloads requiring extremely high determinism. The listed affected package set includes kernel-rt, kernel-rt-core, and kernel-rt-debug variants.

2

What types of kernel flaws are addressed?

The update fixes a crash involving an unvalidated ATM VCC pointer, an out-of-bounds read in the SMB client, an IPv6 NOREF destination use issue in seg6 and RPL lwtunnels, and an out-of-bounds write caused by device-mapper log region_count overflow.

3

Are non-security fixes included in this update?

Yes. It includes a RHEL 9 fix for bonding reporting unknown speed or duplex on tg3 interfaces, and a vhost fix that resets vring metadata cache during vring reconfiguration.

Company

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