RHSA-2026:72467 - Security Advisory

Topic

An update for kernel-rt 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: fbcon: Set fb_display[i]->mode to NULL when the mode is released (CVE-2025-40323)
• kernel: ext4: fix e4b bitmap inconsistency reports (CVE-2026-45942)
• kernel: drm/amdgpu/vcn3: Prevent OOB reads when parsing dec msg (CVE-2026-46230)
• kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing IB (CVE-2026-46204)
• kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing dec msg (CVE-2026-46199)
• kernel: arm64: tlb: Flush walk cache when unsharing PMD tables (CVE-2026-63875)
• kernel: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer (CVE-2026-64034)
• kernel: perf/core: Detach event groups during remove_on_exec (CVE-2026-64556)
• 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: drm/amdgpu: Fix context pstate override handling (CVE-2026-68273)
• kernel: perf: Reject exited events as group leaders (CVE-2026-74753)

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 Real Time 8 x86_64
• Red Hat Enterprise Linux for Real Time for NFV 8 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 8.10 x86_64

Fixes

• BZ - 2419883 - CVE-2025-40323 kernel: fbcon: Set fb_display[i]->mode to NULL when the mode is released
• BZ - 2482104 - CVE-2026-45942 kernel: ext4: fix e4b bitmap inconsistency reports
• BZ - 2482533 - CVE-2026-46230 kernel: drm/amdgpu/vcn3: Prevent OOB reads when parsing dec msg
• BZ - 2482543 - CVE-2026-46204 kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing IB
• BZ - 2482649 - CVE-2026-46199 kernel: drm/amdgpu/vcn4: Prevent OOB reads when parsing dec msg
• BZ - 2502318 - CVE-2026-63875 kernel: arm64: tlb: Flush walk cache when unsharing PMD tables
• BZ - 2502394 - CVE-2026-64034 kernel: net: mana: Fix TOCTOU double-fetch of hwc_msg_id from DMA buffer
• BZ - 2508319 - CVE-2026-64556 kernel: perf/core: Detach event groups during remove_on_exec
• 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 - 2513434 - CVE-2026-68273 kernel: drm/amdgpu: Fix context pstate override handling
• BZ - 2524434 - CVE-2026-74753 kernel: perf: Reject exited events as group leaders

CVEs

• CVE-2025-40323
• CVE-2026-45942
• CVE-2026-46199
• CVE-2026-46204
• CVE-2026-46230
• CVE-2026-63875
• CVE-2026-64034
• CVE-2026-64556
• CVE-2026-68155
• CVE-2026-68156
• CVE-2026-68159
• CVE-2026-68273
• CVE-2026-74753

References

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