CVE-2026-63863

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.