RHSA-2026:34094 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.

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.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: netfilter: conntrack: clamp maximum hashtable size to INT_MAX (CVE-2025-21648)

• kernel: cachestat: fix page cache statistics permission checking (CVE-2025-21691)

• kernel: ALSA: aloop: Fix racy access at PCM trigger (CVE-2026-23191)

• kernel: mptcp: fix slab-use-after-free in __inet_lookup_established (CVE-2026-31669)

• kernel: netfilter: nf_conntrack_helper: pass helper to expect cleanup (CVE-2026-43027)

• kernel: RDMA/umem: Fix double dma_buf_unpin in failure path (CVE-2026-43128)

• kernel: tcp: fix potential race in tcp_v6_syn_recv_sock() (CVE-2026-43198)

• 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: scsi: qla2xxx: Completely fix fcport double free (CVE-2026-43414)

• 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/rxe: Fix double free in rxe_srq_from_init (CVE-2026-45852)

• kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() (CVE-2026-46181)

• kernel: sctp: revalidate list cursor after sctp_sendmsg_to_asoc() in SCTP_SENDALL (CVE-2026-46227)

• kernel: RDMA/mlx5: Fix error path fall-through in mlx5_ib_dev_res_srq_init() (CVE-2026-46176)

• kernel: exit: prevent preemption of oopsing TASK_DEAD task (CVE-2026-46173)

• kernel: netfilter: nft_inner: Fix IPv6 inner_thoff desync (CVE-2026-46244)

Bug Fix(es) and Enhancement(s):

• iavf: during POD churn vlan filters may not be added for a vlan interface, spoofchk drops subsequent packets [rhel-9.6.z] (JIRA:RHEL-172991)

• [rhel-9] WARNING: possible recursive locking detected - vmd_enable_domain+0x757/0x910 [rhel-9.6.z] (JIRA:RHEL-174469)

• RHEL9.4 - s390/mm: Add missing secure storage access fixups [rhel-9.6.z] (JIRA:RHEL-183316)

• drm/mgag200: 300 ms busy loop [rhel-9.6.z] (JIRA:RHEL-150177)

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.