{"cve":"CVE-2026-63863","nvd":{"published":"2026-07-19T15:16:53.200","modified":"2026-10-19T21:17:08.030","status":"Undergoing Analysis","description":"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] =====================================\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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H","score":8.8},"cwes":["CWE-667"],"references":["https://git.kernel.org/stable/c/8efaa47a871662a8c21b819cec60786f7ef17ab4","https://git.kernel.org/stable/c/d287dee565c3c32e1ed76ec1847af46809c29b90"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:43:09.190223697+00:00"},"epss":{"cve":"CVE-2026-63863","score":0.00127,"percentile":0.02395,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}