CVE-2026-80705 drm/amd/display: check if dml21_add_phantom_plane() is successful

Not scored Published 28 Aug 2026 Updated 21 Oct 2026

A missing check in the AMD display driver can cause a kernel segfault, leading to a local denial of service.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: Available

What is CVE-2026-80705?

CVE-2026-80705 is a vulnerability in Linux, published on 28 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: check if dml21_add_phantom_plane() is successful

Verify that the phantom plane was allocated to avoid a later segfault.

(cherry picked from commit 5adb54abe5a8e82cbff7f8806db30a5f4924329f)

Which versions are affected by CVE-2026-80705?

How do I fix CVE-2026-80705?

Apply the vendor's patch.

Is CVE-2026-80705 being exploited?

There is no known exploitation of CVE-2026-80705 in the wild and no public exploit code.

Sources

Also known as BELL-CVE-2026-80705, DEBIAN-CVE-2026-80705, GHSA-q2jh-vg55-chvm, UBUNTU-CVE-2026-80705.