CVE-2025-40276 drm/panthor: Flush shmem writes before mapping buffers CPU-uncached
A missing cache flush in the Panthor GPU driver allows attackers to read sensitive data or cause buffer corruption via dirty cache lines.
- 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-2025-40276?
CVE-2025-40276 is a high-severity vulnerability in Linux, published on 6 Dec 2025. 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/panthor: Flush shmem writes before mapping buffers CPU-uncached
The shmem layer zeroes out the new pages using cached mappings, and if we don't CPU-flush we might leave dirty cachelines behind, leading to potential data leaks and/or asynchronous buffer corruption when dirty cachelines are evicted.
Which versions are affected by CVE-2025-40276?
How do I fix CVE-2025-40276?
Apply the vendor's patch.
Is CVE-2025-40276 being exploited?
There is no known exploitation of CVE-2025-40276 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-40276, DEBIAN-CVE-2025-40276, GHSA-f4hh-m2gg-974r, ROOT-OS-DEBIAN-13-CVE-2025-40276, UBUNTU-CVE-2025-40276.