RHSA-2026:64808 — 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 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: can: bcm: add locking for bcm_op runtime updates (CVE-2025-38004)

• kernel: io_uring/poll: fix signed comparison in io_poll_get_ownership() (CVE-2026-52933)

• kernel: netfilter: nat: use kfree_rcu to release ops (CVE-2026-53000)

• kernel: smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked() (CVE-2026-64136)

• kernel: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page (CVE-2026-64320)

• kernel: nvmet-auth: validate reply message payload bounds against transfer length (CVE-2026-64319)

• kernel: KVM: arm64: Bound used_lrs when flushing the pKVM hyp vCPU (CVE-2026-64287)

• kernel: smb: client: fix change notify replay double-free (CVE-2026-64384)

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.