RHSA-2026:77218 — Security Advisory

Red Hat Security Advisory: kernel security update

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Severity

Important

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · October 7, 2026

Updated · November 4, 2026

Topic

An update for kernel is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.

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: xfrm: hold dev ref until after transport_finish NF_HOOK (CVE-2026-31663)
kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613)
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: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() (CVE-2026-53239)
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: netfilter: synproxy: refresh tcphdr after skb_ensure_writable (CVE-2026-64007)
kernel: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate() (CVE-2026-63921)
kernel: ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress() (CVE-2026-63984)
kernel: xfrm: input: hold netns during deferred transport reinjection (CVE-2026-63919)
kernel: ip6: vti: Use ip6_tnl.net in vti6_changelink() (CVE-2026-63917)
kernel: RDMA/rxe: Fix a use-after-free problem in rxe_mmap (CVE-2026-64582)
kernel: xfrm: fix stale skb->prev after async crypto steals a GSO segment (CVE-2026-68426)
kernel: nvmet-auth: reject short AUTH_RECEIVE buffers (CVE-2026-72130)
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)

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.