RHSA-2026:18587 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 9.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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: bonding: check xdp prog when set bond mode (CVE-2025-22105)

• kernel: block: fix resource leak in blk_register_queue() error path (CVE-2025-37980)

• kernel: dmaengine: idxd: fix memory leak in error handling path of idxd_alloc (CVE-2025-38015)

• kernel: espintcp: remove encap socket caching to avoid reference leak (CVE-2025-38097)

• kernel: bpf: fix ktls panic with sockmap (CVE-2025-38166)

• kernel: bpf: Do not include stack ptr register in precision backtracking bookkeeping (CVE-2025-38279)

• kernel: nfs: Clean up /proc/net/rpc/nfs when nfs_fs_proc_net_init() fails (CVE-2025-38400)

• kernel: nvmet: fix memory leak of bio integrity (CVE-2025-38405)

• kernel: netfilter: flowtable: account for Ethernet header in nf_flow_pppoe_proto() (CVE-2025-38441)

• kernel: net: vlan: fix VLAN 0 refcount imbalance of toggling filtering during runtime (CVE-2025-38470)

• kernel: fs: writeback: fix use-after-free in __mark_inode_dirty() (CVE-2025-39866)

• kernel: dm: fix NULL pointer dereference in __dm_suspend() (CVE-2025-40134)

• kernel: wifi: mac80211_hwsim: fix typo in frequency notification (CVE-2026-23040)

• kernel: Linux kernel: Denial of service and memory corruption in RDMA umad (CVE-2026-23243)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat Enterprise Linux 9 Release Notes linked from the References section.