RHSA-2026:86033 — Security Advisory

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

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Severity

Important

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · October 21, 2026

Updated · November 4, 2026

Topic

An update for kernel is now available for Red Hat Enterprise Linux 9.

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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: openvswitch: defer tunnel netdev_put to RCU release (CVE-2026-31678)
kernel: xfrm: espintcp: do not reuse an in-progress partial send (CVE-2026-52935)
kernel: USB: serial: mxuport: fix memory corruption with small endpoint (CVE-2026-63899)
kernel: bridge: mcast: Fix a possible use-after-free when removing a bridge port (CVE-2026-64032)
kernel: tcp: fix stale per-CPU tcp_tw_isn leak enabling ISN prediction (CVE-2026-64024)
kernel: usb: typec: tcpm: bound altmode_desc[] per iteration in svdm_consume_modes() (CVE-2026-63962)
kernel: Bluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close (CVE-2026-63974)
kernel: ipv4: raw: reject IP_HDRINCL packets with ihl < 5 (CVE-2026-64114)
kernel: ipv4: fib: free fib_alias with kfree_rcu() on insert error path (CVE-2026-64572)
kernel: Bluetooth: hci_sync: Fix advertising data UAFs (CVE-2026-74509)
kernel: Linux kernel: Denial of Service due to incorrect GSO state handling in network fragment reassembly (CVE-2026-80590)
kernel: smb: client: fix OOB read/write from unvalidated DataOffset in coalesce_t2() (CVE-2026-89633)
kernel: perf: Fix addr_filter_ranges lifetime (CVE-2026-93817)
kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation ()
kernel: exec: Cleanup POSIX timers right after de_thread() (CVE-2026-98260)
kernel: ipv4: validate checksum_start before completing checksum (CVE-2026-99999)

Bug Fix(es) and Enhancement(s):

Batch: z-stream xfrm - rhel-9.8.z (NST-Core-26W38) (JIRA:RHEL-256697)

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.