RHSA-2026:40068 - 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 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: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr (CVE-2025-68183)
• kernel: smb: client: fix OOB reads parsing symlink error response (CVE-2026-31613)
• kernel: net: sched: act_csum: validate nested VLAN headers (CVE-2026-31684)
• kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)
• kernel: rtmutex: Use waiter::task instead of current in remove_waiter() (CVE-2026-43499)
• kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path (CVE-2026-46189)
• kernel: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs() (CVE-2026-46209)
• kernel: nvmet-tcp: fix race between ICReq handling and queue teardown (CVE-2026-46135)
• kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock (CVE-2026-53166)

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.

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 - 2422699 - CVE-2025-68183 kernel: ima: don't clear IMA_DIGSIG flag when setting or removing non-IMA xattr
• BZ - 2461480 - CVE-2026-31613 kernel: smb: client: fix OOB reads parsing symlink error response
• BZ - 2461757 - CVE-2026-31684 kernel: net: sched: act_csum: validate nested VLAN headers
• BZ - 2464369 - CVE-2026-43027 kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup
• BZ - 2480453 - CVE-2026-43499 kernel: rtmutex: Use waiter::task instead of current in remove_waiter()
• BZ - 2482588 - CVE-2026-46189 kernel: RDMA/vmw_pvrdma: Fix double free on pvrdma_alloc_ucontext() error path
• BZ - 2482636 - CVE-2026-46209 kernel: drm/gem: Fix inconsistent plane dimension calculation in drm_gem_fb_init_with_funcs()
• BZ - 2482654 - CVE-2026-46135 kernel: nvmet-tcp: fix race between ICReq handling and queue teardown
• BZ - 2492805 - CVE-2026-53166 kernel: futex/requeue: Prevent NULL pointer dereference in remove_waiter() on self-deadlock

CVEs

• CVE-2025-68183
• CVE-2026-31613
• CVE-2026-31684
• CVE-2026-43027
• CVE-2026-43499
• CVE-2026-46135
• CVE-2026-46189
• CVE-2026-46209
• CVE-2026-53166

References

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