CVE-2026-97900
UnknownSummary
In the Linux kernel, drm_exec_prepare_array() silently returns success without calling drm_exec_lock_contended() when num_objects is zero. This breaks the invariant that every entry point must first attempt to lock any previously contended object. Drivers chaining multiple calls can spin forever when an empty array never clears exec->contended.
Risk Assessment
This can cause a system hang (infinite loop) in DRM drivers such as amdgpu, leading to denial of service. It requires local access to DRM interfaces.
Recommendation
Update the Linux kernel to a version with the fix that calls drm_exec_lock_contended() directly when num_objects is zero. Avoid using vulnerable DRM drivers until updated.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/drm_exec: fix up contended obj when num_objects is 0 drm_exec_prepare_array() silently returns success without calling drm_exec_lock_contended() when num_objects is zero. This breaks the invariant upheld by drm_exec_lock_obj(), where every entry point into the locking sequence must first attempt to lock any previously contended object before proceeding. Drivers that chain multiple drm_exec_prepare_array() calls per drm_exec_until_all_locked() iteration (e.g. amdgpu's userq signal/wait ioctls, which prepare separate read and write BO arrays) can pass an empty array for one of the two calls. If contention is hit while preparing the non-empty array, exec->contended is set and the loop retries; on retry, the empty-array call preceding it is a no-op that never clears exec->contended, so drm_exec_retry_on_contention() immediately jumps back to the top of the loop without ever reaching the call that would resolve the contention. This spins forever. Fix it by having drm_exec_prepare_array() call drm_exec_lock_contended() directly when num_objects is zero, so a pending contended object dont loop infinitely.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS