CVE-2025-38104

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

drm/amdgpu: Replace Mutex with Spinlock for RLCG register access to avoid Priority Inversion in SRIOV

RLCG Register Access is a way for virtual functions to safely access GPU

registers in a virtualized environment., including TLB flushes and

register reads. When multiple threads or VFs try to access the same

registers simultaneously, it can lead to race conditions. By using the

RLCG interface, the driver can serialize access to the registers. This

means that only one thread can access the registers at a time,

preventing conflicts and ensuring that operations are performed

correctly. Additionally, when a low-priority task holds a mutex that a

high-priority task needs, ie., If a thread holding a spinlock tries to

acquire a mutex, it can lead to priority inversion. register access in

amdgpu_virt_rlcg_reg_rw especially in a fast code path is critical.

The call stack shows that the function amdgpu_virt_rlcg_reg_rw is bei

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References