RHSA-2026:77217 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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: ALSA: 6fire: fix use-after-free on disconnect (CVE-2026-31581)
• kernel: gfs2: Fix use-after-free in iomap inline data write path (CVE-2026-45984)
• kernel: udf: fix partition descriptor append bookkeeping (CVE-2026-45991)
• 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: sctp: purge outqueue on stale COOKIE-ECHO handling (CVE-2026-52924)
• kernel: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx() (CVE-2026-53239)
• 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: 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: net: qrtr: restrict socket creation to the initial network namespace (CVE-2026-68294)
• kernel: xfrm: fix stale skb->prev after async crypto steals a GSO segment (CVE-2026-68426)
• kernel: scsi: libiscsi_tcp: Bound SCSI Response data segment to the connection buffer (CVE-2026-74556)
• kernel: netfilter: flowtable: publish GC-visible tuple last (CVE-2026-74746)
• 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):

• xfs corruption from [xfs_trans_cancel] during inode allocation (JIRA:RHEL-257185)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Red Hat recommends treating all kernel errata as security-relevant. Given the kernel's fundamental role, any bug has a higher chance of impacting system security, even if that impact only becomes clear after a fix is published. Therefore, Red Hat prioritizes delivering fixes that improve our customers' overall security posture.

Because of this proactive approach, a patch may be associated with a CVE assignment at a future date. Retroactive CVE assignments are always documented in the corresponding errata and on Red Hat's CVE pages. We strongly advise against delaying updates, as doing so may leave your system exposed when protections are already available.

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle Long Life 8.4 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle Long Life 8.4 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle Long Life 8.4 s390x

Fixes

• BZ - 2461462 - CVE-2026-31663 kernel: xfrm: hold dev ref until after transport_finish NF_HOOK
• BZ - 2461471 - CVE-2026-31581 kernel: ALSA: 6fire: fix use-after-free on disconnect
• BZ - 2481922 - CVE-2026-45984 kernel: gfs2: Fix use-after-free in iomap inline data write path
• BZ - 2482113 - CVE-2026-45991 kernel: udf: fix partition descriptor append bookkeeping
• BZ - 2482127 - CVE-2026-46043 kernel: RDMA/rxe: Validate pad and ICRC before payload_size() in rxe_rcv
• BZ - 2482550 - CVE-2026-46133 kernel: RDMA/rxe: Reject unknown opcodes before ICRC processing
• BZ - 2492095 - CVE-2026-52924 kernel: sctp: purge outqueue on stale COOKIE-ECHO handling
• BZ - 2492779 - CVE-2026-53239 kernel: xfrm: policy: fix use-after-free on inexact bin in xfrm_policy_bysel_ctx()
• BZ - 2502361 - CVE-2026-64007 kernel: netfilter: synproxy: refresh tcphdr after skb_ensure_writable
• BZ - 2502368 - CVE-2026-63921 kernel: ip6: vti: Use ip6_tnl.net in vti6_siocdevprivate()
• BZ - 2502412 - CVE-2026-63919 kernel: xfrm: input: hold netns during deferred transport reinjection
• BZ - 2502434 - CVE-2026-63917 kernel: ip6: vti: Use ip6_tnl.net in vti6_changelink()
• BZ - 2511448 - CVE-2026-64582 kernel: RDMA/rxe: Fix a use-after-free problem in rxe_mmap
• BZ - 2513353 - CVE-2026-68294 kernel: net: qrtr: restrict socket creation to the initial network namespace
• BZ - 2513477 - CVE-2026-68426 kernel: xfrm: fix stale skb->prev after async crypto steals a GSO segment
• BZ - 2517010 - CVE-2026-74556 kernel: scsi: libiscsi_tcp: Bound SCSI Response data segment to the connection buffer
• BZ - 2524483 - CVE-2026-74746 kernel: netfilter: flowtable: publish GC-visible tuple last
• BZ - 2528646 - CVE-2026-80864 kernel: RDMA/rxe: Fix responder UAF on IB_QP_MAX_DEST_RD_ATOMIC modify_qp
• BZ - 2528665 - CVE-2026-80863 kernel: RDMA/rxe: Fix OOB in free_rd_atomic_resources()

CVEs

• CVE-2026-31581
• CVE-2026-31663
• CVE-2026-45984
• CVE-2026-45991
• CVE-2026-46043
• CVE-2026-46133
• CVE-2026-52924
• CVE-2026-53239
• CVE-2026-63917
• CVE-2026-63919
• CVE-2026-63921
• CVE-2026-64007
• CVE-2026-64582
• CVE-2026-68294
• CVE-2026-68426
• CVE-2026-74556
• CVE-2026-74746
• CVE-2026-80863
• CVE-2026-80864

References

• https://access.redhat.com/security/updates/classification/#important