RHSA-2026:33900 - Security Advisory

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 9.2 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.

Security Fix(es):

• kernel: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)
• kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128)
• kernel: ALSA: usb-audio: Add sanity check for OOB writes at silencing (CVE-2026-43279)
• kernel: dlm: validate length in dlm_search_rsb_tree (CVE-2026-43125)
• kernel: netfilter: flowtable: strictly check for maximum number of actions (CVE-2026-43329)
• kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows (CVE-2026-43501)
• kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop (CVE-2026-46090)
• kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181)
• kernel: exit: prevent preemption of oopsing TASK_DEAD task (CVE-2026-46173)

Bug Fix(es) and Enhancement(s):

• [rhel-9] WARNING: possible recursive locking detected - vmd_enable_domain+0x757/0x910 (JIRA:RHEL-174467)

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 - Update Services for SAP Solutions 9.2 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle 9.2 x86_64

Fixes

• BZ - 2461503 - CVE-2026-31669 kernel: mptcp: fix slab-use-after-free in __inet_lookup_established
• BZ - 2467144 - CVE-2026-43128 kernel: RDMA/umem: Fix double dma_buf_unpin in failure path
• BZ - 2467215 - CVE-2026-43279 kernel: ALSA: usb-audio: Add sanity check for OOB writes at silencing
• BZ - 2467234 - CVE-2026-43125 kernel: dlm: validate length in dlm_search_rsb_tree
• BZ - 2468124 - CVE-2026-43329 kernel: netfilter: flowtable: strictly check for maximum number of actions
• BZ - 2480457 - CVE-2026-43501 kernel: ipv6: rpl: reserve mac_len headroom when recompressed SRH grows
• BZ - 2481980 - CVE-2026-46090 kernel: ALSA: aloop: Fix peer runtime UAF during format-change stop
• BZ - 2482532 - CVE-2026-46181 kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()
• BZ - 2482634 - CVE-2026-46173 kernel: exit: prevent preemption of oopsing TASK_DEAD task

CVEs

• CVE-2026-31669
• CVE-2026-43125
• CVE-2026-43128
• CVE-2026-43279
• CVE-2026-43329
• CVE-2026-43501
• CVE-2026-46090
• CVE-2026-46173
• CVE-2026-46181

References

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