Deadlock Vulnerability in Linux Kernel Affecting AMD Graphics Drivers

CVE-2025-40332

What is CVE-2025-40332?

A deadlock vulnerability exists in the Linux kernel due to an improper handling of mmap write locks within the AMD graphics driver. When an mmap write lock is obtained during a drain of retry fault, it fails to release, resulting in potential system hangs and impaired performance. This issue arises from the way the SVM range restore pages function interacts with the locking mechanisms, specifically failing to downgrade the mmap write lock to a read lock. Consequently, subsequent attempts to acquire the mmap read or write lock can lead to critical deadlock scenarios.

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