CVE-2026-43305

A flaw was found in the drm/amd/display component of the Linux kernel. A mismatched unlock operation for the DMUB hardware (HW) lock in the HWSS fast path can occur. This happens because the logic for determining when to use the lock differs from the logic for when to unlock it. When the fast path is utilized on systems without FAMS (Fast Access Memory Support) hardware, this discrepancy can lead to a system hang, resulting in a Denial of Service (DoS).