RHSA-2026:27354 - 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: Linux kernel: Use-after-free in bonding driver leads to denial of service (CVE-2026-31419)
• kernel: drm/amd/display: Do not skip unrelated mode changes in DSC validation (CVE-2026-31488)
• kernel: net: mana: fix use-after-free in add_adev() error path (CVE-2026-43056)
• kernel: ALSA: usb-audio: Add sanity check for OOB writes at silencing (CVE-2026-43279)
• kernel: net/sched: act_pedit: extend the writable skb range per key (CVE-2026-46331)
• kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop (CVE-2026-46090)
• kernel: RDMA/mana: Validate rx_hash_key_len (CVE-2026-46145)
• kernel: nvmet-tcp: fix race between ICReq handling and queue teardown (CVE-2026-46135)

Bug Fix(es) and Enhancement(s):

• RHEL8 RT kernel panic in replenish_dl_entity() caused by stale DEADLINE PI state during rt_mutex de-boosting (JIRA:RHEL-178520)

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 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 - 2457829 - CVE-2026-31419 kernel: Linux kernel: Use-after-free in bonding driver leads to denial of service
• BZ - 2460619 - CVE-2026-31488 kernel: drm/amd/display: Do not skip unrelated mode changes in DSC validation
• BZ - 2464449 - CVE-2026-43056 kernel: net: mana: fix use-after-free in add_adev() error path
• BZ - 2467215 - CVE-2026-43279 kernel: ALSA: usb-audio: Add sanity check for OOB writes at silencing
• BZ - 2479492 - CVE-2026-46331 kernel: net/sched: act_pedit: extend the writable skb range per key
• BZ - 2481980 - CVE-2026-46090 kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop
• BZ - 2482581 - CVE-2026-46145 kernel: RDMA/mana: Validate rx_hash_key_len
• BZ - 2482654 - CVE-2026-46135 kernel: nvmet-tcp: fix race between ICReq handling and queue teardown

CVEs

• CVE-2026-31419
• CVE-2026-31488
• CVE-2026-43056
• CVE-2026-43279
• CVE-2026-46090
• CVE-2026-46135
• CVE-2026-46145
• CVE-2026-46331

References

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