CVEvulnerability
CVE-2026-93689
6.8 MEDIUM
Official page ↗
- Status
- Awaiting Analysis
- Published
- 2026-09-18
- Last modified
- 2026-09-22
- Assigner
- [email protected]
- CVSS 4.0 ([email protected])
- 6.8 MEDIUM — 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- CVSS 3.1 ([email protected])
- 5.5 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-476
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.
Related
Weakness · CWE (1)
- CWE-476 NULL Pointer Dereference weakness
References
- https://github.com/winfsp/winfsp github.com
- https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L105-L114 github.com
- https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L146-L152 github.com
- https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L68-L73 github.com
- https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/volume.c#L1059-L1060 github.com
- https://github.com/winfsp/winfsp/commit/b8103265ec63fa87ac264c62bb796dbc38376652 github.com
- https://github.com/winfsp/winfsp/releases/tag/v2.2B4 github.com
- https://www.vulncheck.com/advisories/winfsp-through-2.2.26215-null-pointer-dereference-via-fast-i-o www.vulncheck.com