RHSA-2026:66325 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.

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: Linux kernel: Denial of Service in qla2xxx SCSI driver due to improper command handling after chip reset (CVE-2025-68745)
• kernel: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show() (CVE-2026-46149)
• kernel: netfilter: nf_log: validate MAC header was set before dumping it (CVE-2026-52942)
• kernel: sctp: diag: reject stale associations in dump_one path (CVE-2026-52917)
• kernel: net: pull headers in qdisc_pkt_len_segs_init() (CVE-2026-53091)
• kernel: netfilter: nf_conntrack_sip: don't use simple_strtoul (CVE-2026-52986)
• kernel: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing (CVE-2026-53246)
• kernel: tipc: fix slab-use-after-free Read in tipc_aead_decrypt_done (CVE-2026-63801)
• kernel: sctp: fix race between sctp_wait_for_connect and peeloff (CVE-2026-63971)
• kernel: security/keys: fix missed RCU read section on lookup (CVE-2026-64015)
• kernel: ixgbevf: fix use-after-free in VEPA multicast source pruning (CVE-2026-64113)
• kernel: sctp: fix auth_hmacs array size in struct sctp_cookie (CVE-2026-68376)
• kernel: tipc: clear sock->sk on the failed-insert path in tipc_sk_create() (CVE-2026-68117)
• kernel: sctp: auth: verify auth requirement when auth_chunk is NULL (CVE-2026-68300)
• kernel: sctp: validate stream count in sctp_process_strreset_inreq() (CVE-2026-68315)

Bug Fix(es) and Enhancement(s):

• scsi: mpt3sas: avoid freeing unallocated PCIe SGL buffers [rhel 8.6.z] (JIRA:RHEL-194117)
• gfs2: harden gfs2_glock_hold [RHEL-8] (JIRA:RHEL-240340)

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 8 x86_64
• Red Hat Enterprise Linux for IBM z Systems 8 s390x
• Red Hat Enterprise Linux for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux for ARM 64 8 aarch64
• Red Hat CodeReady Linux Builder for x86_64 8 x86_64
• Red Hat CodeReady Linux Builder for Power, little endian 8 ppc64le
• Red Hat CodeReady Linux Builder for ARM 64 8 aarch64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 8.10 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 8.10 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 8.10 s390x

Fixes

• BZ - 2425039 - CVE-2025-68745 kernel: Linux kernel: Denial of Service in qla2xxx SCSI driver due to improper command handling after chip reset
• BZ - 2482566 - CVE-2026-46149 kernel: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show()
• BZ - 2492091 - CVE-2026-52942 kernel: netfilter: nf_log: validate MAC header was set before dumping it
• BZ - 2492115 - CVE-2026-52917 kernel: sctp: diag: reject stale associations in dump_one path
• BZ - 2492270 - CVE-2026-53091 kernel: net: pull headers in qdisc_pkt_len_segs_init()
• BZ - 2492397 - CVE-2026-52986 kernel: netfilter: nf_conntrack_sip: don't use simple_strtoul
• BZ - 2492771 - CVE-2026-53246 kernel: sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
• BZ - 2502254 - CVE-2026-63801 kernel: tipc: fix slab-use-after-free Read in tipc_aead_decrypt_done
• BZ - 2502331 - CVE-2026-63971 kernel: sctp: fix race between sctp_wait_for_connect and peeloff
• BZ - 2502380 - CVE-2026-64015 kernel: security/keys: fix missed RCU read section on lookup
• BZ - 2502541 - CVE-2026-64113 kernel: ixgbevf: fix use-after-free in VEPA multicast source pruning
• BZ - 2513253 - CVE-2026-68376 kernel: sctp: fix auth_hmacs array size in struct sctp_cookie
• BZ - 2513397 - CVE-2026-68117 kernel: tipc: clear sock->sk on the failed-insert path in tipc_sk_create()
• BZ - 2513408 - CVE-2026-68300 kernel: sctp: auth: verify auth requirement when auth_chunk is NULL
• BZ - 2513474 - CVE-2026-68315 kernel: sctp: validate stream count in sctp_process_strreset_inreq()

CVEs

• CVE-2025-68745
• CVE-2026-46149
• CVE-2026-52917
• CVE-2026-52942
• CVE-2026-52986
• CVE-2026-53091
• CVE-2026-53246
• CVE-2026-63801
• CVE-2026-63971
• CVE-2026-64015
• CVE-2026-64113
• CVE-2026-68117
• CVE-2026-68300
• CVE-2026-68315
• CVE-2026-68376

References

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