RHSA-2026:27729 — Security Advisory

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

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Severity

Critical

Red Hat Product Security

RHEL 7

Products

Official CSAF product identity

Published · June 22, 2026

Updated · November 4, 2026

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7 Extended Lifecycle Support.

Red Hat Product Security has rated this update as having a security impact of Critical. 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: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)
kernel: ip6_tunnel: clear skb2->cb[] in ip4ip6_err() (CVE-2026-43037)
kernel: wifi: brcmfmac: validate bsscfg indices in IF events (CVE-2026-43110)
kernel: netfilter: xt_tcpmss: check remaining length before reading optlen (CVE-2026-43190)
kernel: xfs: fix freemap adjustments when adding xattrs to leaf blocks (CVE-2026-43158)
kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243)

Bug Fix(es) and Enhancement(s):

RHEL-124698 missed the last line of the backport (JIRA:RHEL-168608)

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.