Linux Kernel: amdgpu vblank counter read during GPU reset causes lockdep warning
CVE-2026-99090 Published on October 26, 2026
drm/amdgpu: serialize vblank counter reads against GPU reset
In the Linux kernel, the following vulnerability has been resolved:
drm/amdgpu: serialize vblank counter reads against GPU reset
The vblank counter callback reads display registers and scanout
position without holding reset_domain->sem. During GPU recovery,
display commit work can call the callback while reset owns the
semaphore for writing. The hardware access then triggers the
lockdep_assert_held() in amdgpu_device_skip_hw_access() and sets
TAINT_WARN when lockdep is enabled.
Try to acquire the reset semaphore for reading before accessing the
hardware, and hold it across the counter and scanout-position reads.
If reset is already in progress, return DRM's cached software vblank
count instead. This avoids blocking behind reset and avoids accessing
display hardware while it is being reset.
The cached count is less accurate than the hardware count, but is
used only when reset prevents a safe hardware read. This addresses
the reset-time warning from this vblank path; it does not suppress or
fix unrelated lockdep warnings.
(cherry picked from commit 51a4359f7431a4be5e42803c8bdaf7e0e5be2934)
Products Associated with CVE-2026-99090
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 037796d9ca1da97978deaefd88ca5649f6cb69f5 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 11b6193c8841a052b7907006ffb1e02468b1448e is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 8d6f773d7479034a574ecc3b585bcd07d46b4824 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below f4a0a1ce147d1a6e428d7cb5e3b99fd695139fc7 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 1a6023edfbb5673f55fab6348f135fb3b1428ea5 is affected.
- Before 6.6.160 is affected.
- Before 6.12.113 is affected.
- Before 6.18.57 is affected.
- Before 7.2.11 is affected.
- Version 6.6.160, <= 6.6.* is unaffected.
- Version 6.12.113, <= 6.12.* is unaffected.
- Version 6.18.57, <= 6.18.* is unaffected.
- Version 7.2.11, <= 7.2.* is unaffected.
- Version 7.3, <= * is unaffected.