RHSA-2026:89082 — Security Advisory

Red Hat Security Advisory: kernel-rt security, bug fix, and enhancement update

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Severity

Important

Red Hat Product Security

RHEL 8

Products

Official CSAF product identity

Published · October 25, 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: tcp: restrict SO_ATTACH_FILTER to priv users (CVE-2026-53236)
kernel: fuse: re-lock request before replacing page cache folio (CVE-2026-53388)
kernel: writeback: fix race between cgroup_writeback_umount() and inode_switch_wbs() (CVE-2026-64378)
kernel: net: gro: fix double aggregation of flush-marked skbs (CVE-2026-68136)
kernel: net/packet: avoid fanout hook re-registration after unregister (CVE-2026-68338)
kernel: net/iucv: fix use-after-free of a severed iucv_path (CVE-2026-68140)
kernel: net/sched: serialize qdisc_rtab_list against concurrent get/put (CVE-2026-68138)
kernel: ipvs: reload ip header after head reallocation (CVE-2026-68476)
kernel: selinux: avoid sk_socket dereference in selinux_sctp_bind_connect() (CVE-2026-72242)
kernel: mptcp: options: reset DSS fields in case of unexpected size (CVE-2026-80586)
kernel: usb: usbfs: fix use-after-free of usb_device in usbdev_release() (CVE-2026-80824)
kernel: smb: client: clear setuid/setgid bit on write with cifsacl/modefromsid/posix extensions (CVE-2026-89638)
kernel: net/iucv: filter frames in afiucv_hs_rcv() by ingress device (CVE-2026-81003)
kernel: ipv4: validate checksum_start before completing checksum (CVE-2026-99999)

Bug Fix(es) and Enhancement(s):

Backport 6785011f8b16 ("ipv4: validate checksum_start before completing checksum") [rhel-8.10.z] (JIRA:RHEL-280584)

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.