High [CVE-2026-64080] Snapshot notifier callbacks under lock

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Snapshot notifier callbacks under lock Both notification handlers currently look up a notifier callback under notify_lock, drop the lock, and then dereference the returned notifier entry.

A concurrent unregister can delete and free that entry in the gap, leaving the handler to dereference stale memory. Copy the callback pointer and callback data while notify_lock is still held and invoke the callback only after the lock is dropped.

This keeps the existing callback execution model while removing the use-after-free window in both the framework and non-framework notification paths. A flaw was found in the Linux kernel's ARM Firmware Framework for Arm (FFA) component.

This vulnerability occurs because the system's notification handlers do not properly manage memory when processing callbacks. A timing issue can allow a callback to be unregistered and freed while it is still being accessed, leading to a use-after-free condition.

This can result in system instability or unexpected behavior. Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-825. Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.