CVE-2025-40332 drm/amdkfd: Fix mmap write lock not release
A local attacker can trigger a deadlock in the Linux kernel's AMD GPU driver, causing a system hang and 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-2025-40332?
CVE-2025-40332 is a denial of service vulnerability in Linux, published on 9 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/amdkfd: Fix mmap write lock not release
If mmap write lock is taken while draining retry fault, mmap write lock is not released because svm_range_restore_pages calls mmap_read_unlock then returns. This causes deadlock and system hangs later because mmap read or write lock cannot be taken.
Downgrade mmap write lock to read lock if draining retry fault fix this bug.
Which versions are affected by CVE-2025-40332?
How do I fix CVE-2025-40332?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-40332 being exploited?
There is no known exploitation of CVE-2025-40332 in the wild and no public exploit code.
Sources
Also known as BELL-CVE-2025-40332, DEBIAN-CVE-2025-40332, GHSA-cqv3-6vqr-2pmm, ROOT-OS-DEBIAN-12-CVE-2025-40332, ROOT-OS-DEBIAN-13-CVE-2025-40332, ROOT-OS-UBUNTU-2204-CVE-2025-40332 and 2 more.