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VULNERABILITIES

CVE-2026-93689 Details

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.

Metrics

CVSS 3.x Severity and Vector Strings:

CNA: [email protected]CVSS-B:5.5 MEDIUMVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References to Advisories, Solutions, and Tools

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URLSource(s)Tag(s)
https://github.com/winfsp/winfsp [email protected]
https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L105-L114 [email protected]
https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L146-L152 [email protected]
https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/devctl.c#L68-L73 [email protected]
https://github.com/winfsp/winfsp/blob/v2.2B4/src/sys/volume.c#L1059-L1060 [email protected]

see all 8 references

Weakness Enumeration

CWE-IDCWE NameSource
CWE-476NULL Pointer Dereference[email protected]

Affected Products

No affected product data is available for this CVE.

Change History

2 change records found show changes

QUICK INFO

CVE Dictionary Entry:
CVE-2026-93689
NVD Published Date:
Sep 18, 2026
NVD Last Modified:
Sep 22, 2026
Source:
[email protected]
CVE-2026-93689 Details - Not Deferred