RHSA-2026:85774 — Security Advisory

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.

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: xfrm: espintcp: do not reuse an in-progress partial send (CVE-2026-52935)

• kernel: USB: serial: io_ti: fix heap overflow in get_manuf_info() (CVE-2026-53196)

• kernel: sctp: keep chunk->transport in step with the list it is queued on (CVE-2026-74588)

• kernel: sctp: validate cookie AUTH state before use (CVE-2026-74752)

• kernel: smb: client: reject a tree connect response whose byte count is too small (CVE-2026-89631)

• kernel: sctp: stop processing a packet once its association is deleted (CVE-2026-89479)

• kernel: perf: Fix addr_filter_ranges lifetime (CVE-2026-93817)

• kernel: netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state (CVE-2026-93288)

• kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation ()

• kernel: netfilter: flowtable: hold reference on ct until flow is released (CVE-2026-98320)

Bug Fix(es) and Enhancement(s):

• gfs2 filesystem withdrawal rework [RHEL-8] (JIRA:RHEL-129363)

• Batch: z-stream xfrm - rhel-8.10.z (NST-Core-26W38) (JIRA:RHEL-256684)

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.