Mutex Replacement in AMD GPU Driver for Enhanced Thread Safety

CVE-2025-38104

Summary

A vulnerability in the AMDGPU driver allows for race conditions during RLCG register access within virtualized environments. This issue arises from the improper handling of mutexes, which can lead to priority inversion when multiple threads attempt concurrent access to the GPU registers. By replacing the mutex with a spinlock for RLCG register operations, the AMDGPU driver ensures that register access is serialized, preventing conflicts and ensuring accurate execution flow. The fix addresses the critical need for thread safety, especially in high-performance computing scenarios using SR-IOV.

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