RHSA-2026:87374 — 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 · October 22, 2026

Updated · November 4, 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: ipv4: raw: reject IP_HDRINCL packets with ihl < 5 (CVE-2026-64114)
kernel: fuse: re-lock request before returning from fuse_ref_folio() (CVE-2026-64266)
kernel: ipv4: fib: free fib_alias with kfree_rcu() on insert error path (CVE-2026-64572)
kernel: ALSA: seq: close a re-opened queue timer in the destructor (CVE-2026-68202)
kernel: xfs: bounds-check buffer log item's dirty bitmap (CVE-2026-80536)
kernel: inet: frags: strip GSO state from fragments before reassembly (CVE-2026-80590)
kernel: vfio/pci: clear vdev->msi_perm after freeing it on init failure (CVE-2026-89777)

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.