RHSA-2026:94996 - Security Advisory

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.

Red Hat Product Security has rated this update as having a security impact of Critical. 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: net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change (CVE-2025-71066)
• kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat() (CVE-2026-46259)
• kernel: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path (CVE-2026-64534)
• kernel: Linux kernel: libceph stack out-of-bounds write via crafted OSDMap (CVE-2026-68159)
• kernel: libceph: refresh auth->authorizer_buf{,_len} after authorizer update (CVE-2026-68156)
• kernel: Linux kernel (libceph): Denial of Service due to malformed monitor maps (CVE-2026-68155)
• kernel: ipvs: reload ip header after head reallocation (CVE-2026-68476)
• kernel: ipvs: clear IPv4 options after rebasing tunnel ICMP errors (CVE-2026-74669)
• kernel: ALSA: usx2y: bound the hwdep mmap fault offset (CVE-2026-74641)
• kernel: ipvs: do not propagate one-packet flag to synced conns (CVE-2026-80714)
• kernel: nvme-tcp: fix host memory disclosure on R2T for a read command (CVE-2026-89481)
• kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period (CVE-2026-98432)
• kernel: ZDI-CAN-33367: Linux Kernel skbuff skb_zerocopy Improper Ownership Management Local Privilege Escalation Vulnerability ()

Bug Fix(es) and Enhancement(s):

• Critical Bug Fixes for customer issues with lpfc [rhel-8.6.z] (JIRA:RHEL-286150)

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 8.6 x86_64
• Red Hat Enterprise Linux Server - AUS 8.6 x86_64

Fixes

• BZ - 2429036 - CVE-2025-71066 kernel: net/sched: ets: Always remove class from active list before deleting in ets_qdisc_change
• BZ - 2484477 - CVE-2026-46259 kernel: procfs: fix missing RCU protection when reading real_parent in do_task_stat()
• BZ - 2507399 - CVE-2026-64534 kernel: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
• BZ - 2513165 - CVE-2026-68159 kernel: Linux kernel: libceph stack out-of-bounds write via crafted OSDMap
• BZ - 2513232 - CVE-2026-68156 kernel: libceph: refresh auth->authorizer_buf{,_len} after authorizer update
• BZ - 2513295 - CVE-2026-68155 kernel: Linux kernel (libceph): Denial of Service due to malformed monitor maps
• BZ - 2516251 - CVE-2026-68476 kernel: ipvs: reload ip header after head reallocation
• BZ - 2521375 - CVE-2026-74669 kernel: ipvs: clear IPv4 options after rebasing tunnel ICMP errors
• BZ - 2521436 - CVE-2026-74641 kernel: ALSA: usx2y: bound the hwdep mmap fault offset
• BZ - 2525436 - CVE-2026-80714 kernel: ipvs: do not propagate one-packet flag to synced conns
• BZ - 2532184 - CVE-2026-89481 kernel: nvme-tcp: fix host memory disclosure on R2T for a read command
• BZ - 2553390 - CVE-2026-98432 kernel: ipv4: free inet_opt and ireq_opt after an RCU grace period
• BZ - 2559835 - kernel: ZDI-CAN-33367: Linux Kernel skbuff skb_zerocopy Improper Ownership Management Local Privilege Escalation Vulnerability

CVEs

• CVE-2025-71066
• CVE-2026-46259
• CVE-2026-64534
• CVE-2026-68155
• CVE-2026-68156
• CVE-2026-68159
• CVE-2026-68476
• CVE-2026-74641
• CVE-2026-74669
• CVE-2026-80714
• CVE-2026-89481
• CVE-2026-98432

References

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