RHSA-2026:77219 — 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 8, 2026

Updated · November 5, 2026

Topic

An update for kernel is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

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: ipv6: add NULL checks for idev in SRv6 paths (CVE-2026-23442)
kernel: RDMA/rxe: Fix race condition in QP timer handlers (CVE-2026-45910)
kernel: RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv (CVE-2026-46043)
kernel: RDMA/rxe: Reject unknown opcodes before ICRC processing (CVE-2026-46133)
kernel: RDMA/rxe: Reject non-8-byte ATOMIC_WRITE payloads (CVE-2026-46114)
kernel: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo() (CVE-2026-63924)
kernel: ipv6: exthdrs: refresh nh after handling HAO option (CVE-2026-63922)
kernel: ipv6: validate extension header length before copying to cmsg (CVE-2026-63920)
kernel: ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress() (CVE-2026-63984)
kernel: Kernel SMB client: Double-free vulnerability allows remote denial of service or privilege escalation (CVE-2026-64385)
kernel: smb: client: fix double-free in SMB2_flush() replay (CVE-2026-64383)
kernel: smb: client: fix query_info() replay double-free (CVE-2026-64386)
kernel: RDMA/rxe: Fix a use-after-free problem in rxe_mmap (CVE-2026-64582)
kernel: ipv6: fix use-after-free in ip6_finish_output2() (CVE-2026-80792)
kernel: RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp (CVE-2026-80864)
kernel: RDMA/rxe: Fix OOB in free_rd_atomic_resources() (CVE-2026-80863)

Bug Fix(es) and Enhancement(s):

gfs2: Remote delete issues [rhel-9.6.z] (JIRA:RHEL-172430)

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.