CVE-2026-93689
mediumWinFsp 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 vo…
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.
CVSS
5.5
5.5 (CVSS v3.1)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Severity source: NVD CVSS v3.1 (disclosure@vulncheck.com)
Timeline (UTC)
Published: 2026-09-18 16:17
Modified: 2026-09-22 20:25
NVD status: Awaiting Analysis
Last synced 3 days ago
Verified against the source API 2026-10-27 06:54 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/winfsp/winfsp disclosure@vulncheck.com
- https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L105-L114 disclosure@vulncheck.com
- https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L146-L152 disclosure@vulncheck.com
- https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L68-L73 disclosure@vulncheck.com
- https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/volume.c#L1059-L1060 disclosure@vulncheck.com
- https://github.com/winfsp/winfsp/commit/b8103265ec63fa87ac264c62bb796dbc38376652 disclosure@vulncheck.com
- https://github.com/winfsp/winfsp/releases/tag/v2.2B4 disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/winfsp-through-2.2.26215-null-pointer-dereference-via... disclosure@vulncheck.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:54 UTC · record ↗