{"id":"CVE-2026-63863","title":"drm/gpusvm: Fix unbalanced unlock in drm_gpusvm_scan_mm()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gpusvm: Fix unbalanced unlock in drm_gpusvm_scan_mm()\n\nThere is a unbalanced lock/unlock to gpusvm notifier lock:\n[  931.045868] ===================================…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= f1d08a5864822684773105c60528e2abb577ca6c < 8efaa47a871662a8c21b819cec60786f7ef17ab4","Linux >= f1d08a5864822684773105c60528e2abb577ca6c < d287dee565c3c32e1ed76ec1847af46809c29b90","Linux 7.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T15:32:32.141561Z"},"published":"2026-07-19","updated":"2026-10-16","sourceUpdated":"2026-10-16T15:42:08.711Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-63863","references":[{"url":"https://git.kernel.org/stable/c/8efaa47a871662a8c21b819cec60786f7ef17ab4"},{"url":"https://git.kernel.org/stable/c/d287dee565c3c32e1ed76ec1847af46809c29b90"}],"tags":["cve.org"],"epss":0.00165,"epssPercentile":0.05341,"ingestedAt":"2026-10-16T17:24:46.770Z","slug":"CVE-2026-63863","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ndrm/gpusvm: Fix unbalanced unlock in drm_gpusvm_scan_mm()\n\nThere is a unbalanced lock/unlock to gpusvm notifier lock:\n[  931.045868] =====================================\n[  931.046509] WARNING: bad unlock balance detected!\n[  931.047149] 6.19.0-rc6+xe-**************** #9 Tainted: G     U\n[  931.048150] -------------------------------------\n[  931.048790] kworker/u5:0/51 is trying to release lock (&gpusvm->notifier_lock) at:\n[  931.049801] [<ffffffffa090c0d8>] drm_gpusvm_scan_mm+0x188/0x460 [drm_gpusvm_helper]\n[  931.050802] but there are no more locks to release!\n[  931.051463]\n\nThe drm_gpusvm_notifier_unlock() sits under err_free label and the\nfirst jump to err_free is just before calling the\ndrm_gpusvm_notifier_lock() causing unbalanced unlock.\n\n## Affected\n\n- `Linux >= f1d08a5864822684773105c60528e2abb577ca6c < 8efaa47a871662a8c21b819cec60786f7ef17ab4`\n- `Linux >= f1d08a5864822684773105c60528e2abb577ca6c < d287dee565c3c32e1ed76ec1847af46809c29b90`\n- `Linux 7.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":48,"depthScoreParts":{"impact":48.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}