RHSA-2026:91489 - Security Advisory

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: Duplicate SPI Handling (CVE-2025-39797)
• kernel: Linux kernel: Denial of Service in qla2xxx SCSI driver due to improper command handling after chip reset (CVE-2025-68745)
• kernel: Bluetooth: MGMT: validate LTK enc_size on load (CVE-2026-43020)
• kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect() (CVE-2026-43023)
• kernel: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table() (CVE-2026-43450)
• kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests (CVE-2026-43493)
• kernel: Linux kernel: xfrm single-frag length not properly limited ()
• kernel: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show() (CVE-2026-46149)
• kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat() (CVE-2026-46259)
• kernel: crypto: af_alg - Cap AEAD AD length to 0x80000000 (CVE-2026-52972)
• kernel: mac802154: llsec: add skb_cow_data() before in-place crypto (CVE-2026-63831)
• kernel: blk-cgroup: fix UAF in __blkcg_rstat_flush() (CVE-2026-63802)
• kernel: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu() (CVE-2026-63993)
• kernel: blk-mq: pop cached request if it is usable (CVE-2026-64017)
• kernel: nvmet-auth: validate reply message payload bounds against transfer length (CVE-2026-64319)
• kernel: selinux: check connect-related permissions on TCP Fast Open (CVE-2026-72243)
• kernel: ALSA: usx2y: bound the hwdep mmap fault offset (CVE-2026-74641)
• kernel: scsi: qla2xxx: Bound rsp_info_len to avoid OOB sense-data read (CVE-2026-89846)
• kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation ()

Bug Fix(es) and Enhancement(s):

• kernel panics caused by NULL pointer dereferences within octeon_ep_vf [rhel-9.4.z] (JIRA:RHEL-186329)
• BUG: sleeping function called from invalid context at kernel/locking/mutex.c:580 [rhel-9.4.z] (JIRA:RHEL-242406)
• Kernel panic reboot node with kernal version 5.14.0-427.68.1.el9_4 [rhel-9.4.z] (JIRA:RHEL-273436)

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 Server - AUS 9.4 x86_64
• Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 9.4 ppc64le
• Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 9.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 9.4 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 9.4 s390x
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.4 x86_64
• Red Hat Enterprise Linux for ARM 64 - Extended Life Cycle 9.4 aarch64
• Red Hat Enterprise Linux for Power, little endian - Extended Life Cycle 9.4 ppc64le
• Red Hat Enterprise Linux for IBM z Systems - Extended Life Cycle 9.4 s390x

Fixes

• BZ - 2400057 - CVE-2025-39797 kernel: xfrm: Duplicate SPI Handling
• BZ - 2425039 - CVE-2025-68745 kernel: Linux kernel: Denial of Service in qla2xxx SCSI driver due to improper command handling after chip reset
• BZ - 2464455 - CVE-2026-43020 kernel: Bluetooth: MGMT: validate LTK enc_size on load
• BZ - 2464496 - CVE-2026-43023 kernel: Bluetooth: SCO: fix race conditions in sco_sock_connect()
• BZ - 2468228 - CVE-2026-43450 kernel: netfilter: nfnetlink_cthelper: fix OOB read in nfnl_cthelper_dump_table()
• BZ - 2479812 - CVE-2026-43493 kernel: crypto: pcrypt - Fix handling of MAY_BACKLOG requests
• BZ - 2482566 - CVE-2026-46149 kernel: scsi: target: configfs: Bound snprintf() return in tg_pt_gp_members_show()
• BZ - 2484477 - CVE-2026-46259 kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat()
• BZ - 2492364 - CVE-2026-52972 kernel: crypto: af_alg - Cap AEAD AD length to 0x80000000
• BZ - 2502243 - CVE-2026-63831 kernel: mac802154: llsec: add skb_cow_data() before in-place crypto
• BZ - 2502251 - CVE-2026-63802 kernel: blk-cgroup: fix UAF in __blkcg_rstat_flush()
• BZ - 2502369 - CVE-2026-63993 kernel: vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
• BZ - 2502449 - CVE-2026-64017 kernel: blk-mq: pop cached request if it is usable
• BZ - 2507096 - CVE-2026-64319 kernel: nvmet-auth: validate reply message payload bounds against transfer length
• BZ - 2516684 - CVE-2026-72243 kernel: selinux: check connect-related permissions on TCP Fast Open
• BZ - 2521436 - CVE-2026-74641 kernel: ALSA: usx2y: bound the hwdep mmap fault offset
• BZ - 2535391 - CVE-2026-89846 kernel: scsi: qla2xxx: Bound rsp_info_len to avoid OOB sense-data read
• BZ - 2540872 - kernel: kernel: strparser: use-after-free via msg_timer_work rearm after strp_done() cancellation

CVEs

• CVE-2025-39797
• CVE-2025-68745
• CVE-2026-43020
• CVE-2026-43023
• CVE-2026-43450
• CVE-2026-43493
• CVE-2026-46149
• CVE-2026-46259
• CVE-2026-52972
• CVE-2026-63802
• CVE-2026-63831
• CVE-2026-63993
• CVE-2026-64017
• CVE-2026-64319
• CVE-2026-72243
• CVE-2026-74641
• CVE-2026-89846

References

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