CVE-2026-68256

A flaw was found in the drm/amd/display component of the Linux kernel. This issue occurs in the detect_link_and_local_sink function, where a prev_sink reference is not properly released if the DisplayPort (DP) alt mode timeout path returns false. This missing cleanup can lead to a memory leak, potentially resulting in a Denial of Service (DoS) due to resource exhaustion.

This issue affects systems using the AMDGPU display stack with DisplayPort alt mode detection. On DP alt mode timeout, detect_link_and_local_sink() returns without releasing a retained prev_sink reference, leaking sink objects over repeated hotplug events. Systems without AMD GPUs are not affected.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.