PT-2026-34551 · Winfsp · Winfsp

Tay Kiat Loong · Published 2026-04-22 · Updated 2026-05-07 · CVE-2026-3006

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions WinFSP versions prior to 2026 Beta1

Description A race condition vulnerability, specifically a Time-of-Check to Time-of-Use (TOCTOU) bug, exists in the driver. This occurs due to a multi-fetch of size used in ExAllocatePool, which can trigger a kernel heap overflow. Successful exploitation allows an attacker, even from a Low Integrity CMD, to achieve local privilege escalation and gain system-level access.

Recommendations Update to WinFSP version 2026 Beta1.

Fix

LPE

Race Condition

Weakness Enumeration

CWE-362

Related Identifiers

CVE-2026-3006

Affected Products

Winfsp

References · 10

• https://nvd.nist.gov/vuln/detail/CVE-2026-3006 · Security Note
• https://github.com/winfsp/winfsp/releases/tag/v2.2B1 · Note
• https://t.me/CVEtracker/51883 · Telegram Post
• https://twitter.com/VulmonFeeds/status/2048648134452994125 · Twitter Post
• https://t.me/cveNotify/161009 · Telegram Post
• https://twitter.com/CVEnew/status/2048910106000310421 · Twitter Post
• https://csa.gov.sg/alerts-and-advisories/alerts/al-2026-043 · Note
• https://twitter.com/malware_owl/status/2052322507169165820 · Twitter Post
• https://twitter.com/kaspersky/status/2052339850024550849 · Twitter Post
• https://twitter.com/BZissimopoulos/status/2046984860539949388 · Twitter Post