drm/drm_exec: fix up contended obj when num_objects is 0

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97900
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:16 UTC
Updated2026-09-25 11:17:16 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 09593216bff15866f95c8ad406cb7fdcec1ee40a 831cd124ce99c3e61266bed30519d52f7c26abed git Not specified
CNA Linux Linux affected 09593216bff15866f95c8ad406cb7fdcec1ee40a f3e74866018dab793ebee1fdf0ef34f7271d1f8c git Not specified
CNA Linux Linux affected 09593216bff15866f95c8ad406cb7fdcec1ee40a a565022c02f218ec9789c2baf4690792e7a48cbb git Not specified
CNA Linux Linux affected 09593216bff15866f95c8ad406cb7fdcec1ee40a 159720704d9d652b64390c11fb971e15b0a78d23 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/159720704d9d652b64390c11fb971e15b0a78d23 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f3e74866018dab793ebee1fdf0ef34f7271d1f8c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/831cd124ce99c3e61266bed30519d52f7c26abed 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a565022c02f218ec9789c2baf4690792e7a48cbb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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