{"id":"CVE-2026-93689","revision":"90fe2ae68dc447b99c8de25d87b02dcb","records":[{"revision":"90fe2ae68dc447b99c8de25d87b02dcb","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-93689","aliases":[],"title":"WinFsp through 2.2.26215 NULL Pointer Dereference via Fast I/O","description":"WinFsp through 2.2.26215 contains a null pointer dereference vulnerability in the kernel driver's Fast I/O device control handler that fails to validate the volume context before use. An unprivileged local user can trigger a denial of service by opening the WinFsp control device and issuing FSP_IOCTL_TRANSACT requests, causing a system crash.","state":0,"publishedAt":"2026-09-18T15:06:04.237+00:00","modifiedAt":"2026-09-24T14:23:05.325+00:00","affected":[{"ecosystem":"Vendor product","name":"winfsp","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"winfsp\",\n                    \"product\": \"winfsp\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"packageURL\": \"pkg:github/winfsp/winfsp\",\n                    \"repo\": \"https://github.com/winfsp/winfsp\",\n                    \"versions\": [\n                        {\n                            \"version\": \"0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"custom\",\n                            \"lessThanOrEqual\": \"2.2.26215\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":6.8,"severity":"MEDIUM"},{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5,"severity":"MEDIUM"}],"references":["https://github.com/winfsp/winfsp/commit/b8103265ec63fa87ac264c62bb796dbc38376652","https://github.com/winfsp/winfsp","https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L68-L73","https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L105-L114","https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L146-L152","https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/volume.c#L1059-L1060","https://github.com/winfsp/winfsp/releases/tag/v2.2B4","https://www.vulncheck.com/advisories/winfsp-through-2.2.26215-null-pointer-dereference-via-fast-i-o"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-93689","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-93689","identifiers":["CVE-2026-93689"]},"retained":false,"historicalAffected":[]}],"coverage":[]}