RHSA-2026:26428 — 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 · June 17, 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: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)
kernel: xen/privcmd: fix double free via VMA splitting (CVE-2026-31787)
kernel: Buffer overflow in drivers/xen/sys-hypervisor.c (CVE-2026-31786)
kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)
kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329)
kernel: Bluetooth: hci_event: fix potential UAF in SSP passkey handlers (CVE-2026-46056)
kernel: wifi: mac80211: drop stray 'static' from fast-RX rx_result (CVE-2026-46152)
kernel: wifi: mac80211: remove station if connection prep fails (CVE-2026-46125)

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.