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.
Advisories

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Fixes

Solution

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Workaround

No workaround given by the vendor.

History

Fri, 18 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
First Time appeared Winfsp
Winfsp winfsp
Vendors & Products Winfsp
Winfsp winfsp

Fri, 18 Sep 2026 21:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 18 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
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.
Title WinFsp through 2.2.26215 NULL Pointer Dereference via Fast I/O
Weaknesses CWE-476
References
Metrics cvssV3_1

{'score': 5.5, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 6.8, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-18T16:18:45.126Z

Reserved: 2026-09-18T14:39:01.816Z

Link: CVE-2026-93689

cve-icon Vulnrichment

Updated: 2026-09-18T16:18:40.276Z

cve-icon NVD

Status : Received

Published: 2026-09-18T16:17:15.837

Modified: 2026-09-18T17:17:07.437

Link: CVE-2026-93689

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-19T19:00:15Z

Weaknesses