RHSA-2025:21469 — 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: KVM: x86/hyper-v: Skip non-canonical addresses during PV TLB flush (CVE-2025-38351)

• kernel: do_change_type(): refuse to operate on unmounted/not ours mounts (CVE-2025-38498)

• kernel: NFS: Fix a race when updating an existing write (CVE-2025-39697)

• kernel: kernfs: Fix UAF in polling when open file is released (CVE-2025-39881)

• kernel: Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync (CVE-2025-39982)

• kernel: i40e: fix idx validation in config queues msg (CVE-2025-39971)

• kernel: Bluetooth: hci_event: Fix UAF in hci_conn_tx_dequeue (CVE-2025-39983)

• kernel: io_uring/waitid: always prune wait queue entry in io_waitid_wait() (CVE-2025-40047)

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.