CVE-2026-93689
WinFsp through 2.2.26215 NULL Pointer Dereference via Fast I/O
CVSS Score
5.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-476 |
| Vendor | winfsp |
| Product | winfsp |
| Published | Sep 18, 2026 |
| Last Updated | Sep 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
winfsp / winfsp
0 ≤ 2.2.26215
References
github.com: https://github.com/winfsp/winfsp/commit/b8103265ec63fa87ac264c62bb796dbc38376652 github.com: https://github.com/winfsp/winfsp 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/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/volume.c#L1059-L1060 github.com: https://github.com/winfsp/winfsp/releases/tag/v2.2B4 vulncheck.com: https://www.vulncheck.com/advisories/winfsp-through-2.2.26215-null-pointer-dereference-via-fast-i-o
Credits
Luigino Camastra (AISLE Research)