Security Advisory
Denial of Service in CLFS.sys
Wed, 02/25/2026
This vulnerability is caused by CWE‑159: Improper Handling of Invalid Use of Special Elements, which leads to an unrecoverable inconsistency in the CLFS.sys driver. This condition forces a call to the KeBugCheckEx function, allowing an unprivileged user to trigger a system crash. Microsoft silently fixed this vulnerability in the September 2025 cumulative update for Windows 11 2024 LTSC and...
