Issued:
2026-07-24
Updated:
2026-07-24

RHSA-2026:45116 - Important: kernel-rt security update

Synopsis

Important: kernel-rt security update

Type/Severity

Security Advisory: Important

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Description

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: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)

  • kernel: xfrm single-frag length not properly limited

  • kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)

  • kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for x86_64 - Extended Life Cycle8.10x86_64
Red Hat Enterprise Linux for Real Time8x86_64
Red Hat Enterprise Linux for Real Time for NFV8x86_64

Updated Packages

  • kernel-rt-debug-devel-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-kvm-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-modules-extra-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-debug-modules-extra-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-core-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-debuginfo-common-x86_64-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-4.18.0-553.147.1.rt7.488.el8_10.src.rpm
  • kernel-rt-debug-kvm-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-debug-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-modules-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-debug-modules-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-debug-debuginfo-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-debug-core-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-debuginfo-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm
  • kernel-rt-devel-4.18.0-553.147.1.rt7.488.el8_10.x86_64.rpm

Fixes

CVEs

References

Additional information