RHSA-2026:45116 — Security Advisory

Red Hat Security Advisory: kernel-rt security update

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Severity

Important

Red Hat Product Security

RHEL 8

Products

Official CSAF product identity

Published · July 24, 2026

Updated · November 3, 2026

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)