CVE-2026-90289 drm/amd/display: Resize MST HDCP per-connector arrays to 32
An off-by-one error in the AMD display driver's HDCP array sizing can lead to memory corruption or crashes when handling multiple connectors.
- 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-2026-90289?
CVE-2026-90289 is a high-severity vulnerability in Linux, published on 17 Sep 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: Resize MST HDCP per-connector arrays to 32
AMDGPU_DM_MAX_DISPLAY_INDEX is 31. It suggest a maximum number of 32 connectors. But the way it's used is like MAX_DISPLAY_COUNT. Hence we're off by one with DRM core, which supports a max of 32 connectors.
Rename AMDGPU_DM_MAX_DISPLAY_INDEX to AMDGPU_DM_MAX_DISPLAY_COUNT to match its actual use, and increase the size to 32 to match the originally intended size.
Which versions are affected by CVE-2026-90289?
How do I fix CVE-2026-90289?
Apply the vendor's patch.
Is CVE-2026-90289 being exploited?
There is no known exploitation of CVE-2026-90289 in the wild and no public exploit code.
Sources
Also known as AZL-101918, BELL-CVE-2026-90289, DEBIAN-CVE-2026-90289, GHSA-jm7v-p326-mf66, UBUNTU-CVE-2026-90289.