CVE-2026-63863
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved:
drm/gpusvm: Fix unbalanced unlock in drm_gpusvm_scan_mm()
There is a unbalanced lock/unlock to gpusvm notifier lock: [ 931.045868] ===================================== [ 931.046509] WARNING: bad unlock balance detected! [ 931.047149] 6.19.0-rc6+xe-**************** #9 Tainted: G U [ 931.048150] ————————————- [ 931.048790] kworker/u5:0/51 is trying to release lock (&gpusvm->notifier_lock) at: [ 931.049801] [<ffffffffa090c0d8>] drm_gpusvm_scan_mm+0x188/0x460 [drm_gpusvm_helper] [ 931.050802] but there are no more locks to release! [ 931.051463]
The drm_gpusvm_notifier_unlock() sits under err_free label and the first jump to err_free is just before calling the drm_gpusvm_notifier_lock() causing unbalanced unlock.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | f1d08a5864822684773105c60528e2abb577ca6c < 8efaa47a871662a8c21b819cec60786f7ef17ab4 | affected |
| Linux | Linux | f1d08a5864822684773105c60528e2abb577ca6c < d287dee565c3c32e1ed76ec1847af46809c29b90 | affected |
| Linux | Linux | 7.0 | affected |
| Linux | Linux | 0 < 7.0 | unaffected |
| Linux | Linux | 7.0.10 <= 7.0.* | unaffected |
| Linux | Linux | 7.1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/8efaa47a871662a8c21b819cec60786f7ef17ab4
- https://git.kernel.org/stable/c/d287dee565c3c32e1ed76ec1847af46809c29b90
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