CVE Catalog

CVE-2026-93689

MediumCVSS 5.5
Published: Updated: Translated: NVD NIST

Exploitation Probability (EPSS)

Low risk
0.12%

2th percentile - higher than 2% of all known CVEs

Summary

WinFsp through version 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.

Risk Assessment

A local attack can cause a system crash (BSOD), potentially disrupting services and causing downtime.

Recommendation

Update WinFsp to a patched version or restrict access to the control device for unprivileged users.

Related vulnerabilities

Original NVD description (English source)

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.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS