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PoC Released for Windows Vulnerability That Allows Attackers to Cause Unrecoverable BSOD Crashes

A proof-of-concept (PoC) exploit has been released for CVE-2026-2636, a vulnerability identified in the Windows Common Log File System (CLFS) driver. This vulnerability permits low-privileged users to cause an irrecoverable Blue Screen of Death (BSoD) on…

HBy Hazel CaldwellFeb 26, 20261 min read

A proof-of-concept (PoC) exploit has been released for CVE-2026-2636, a vulnerability identified in the Windows Common Log File System (CLFS) driver. This vulnerability permits low-privileged users to cause an irrecoverable Blue Screen of Death (BSoD) on targeted systems.

Discovered by Ricardo Narvaja from Fortra, this vulnerability is classified as a Denial-of-Service (DoS) flaw with a CVSS base score of 5.5. The issue arises from improper flag validation within the CLFS!CClfsRequest::ReadLogPagingIo function inside CLFS.sys , specifically version 10.0.22621.5037.

The vulnerability is triggered when a specific sequence of Windows API calls results in the CLFS driver processing an I/O Request Packet (IRP) with critical flags disabled. This leads to a logic path that invokes nt!KeBugCheckEx , causing the system to enter an irreversible crash state.

IRP_PAGING_IO (0x02): Relates to memory paging operations. IRP_INPUT_OPERATION: Involves input data transfer.

A proof-of-concept (PoC) exploit has been released for CVE-2026-2636, a vulnerability identified in the Windows Common Log File System (CLFS) driver.
Hazel Caldwell · Thehackingpost

For the ReadLogPagingIo to process a request correctly, at least one of these flags must be enabled. In the PoC, both flags were disabled, leading to an incorrect execution path.

The BSoD crash chain begins with a standard ReadFile API call, escalating through the CLFS dispatch chain until KeBugCheckEx is invoked. This sequence can be reproduced without elevated privileges, posing a significant risk in multi-user environments.

The PoC requires only two API calls: CreateLogFile to obtain a valid .blf log file handle, followed by a ReadFile call on the same handle. This combination is unexpected by the CLFS driver, resulting in a kernel panic.

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Apply the September 2025 or later cumulative updates for Windows 11 and Windows Server 2025. Upgrade to Windows 11 2024 LTSC or Windows 25H2 on supported hardware. Restrict local logon access on sensitive systems to reduce the attack surface. Monitor for unusual CLFS API calls, such as ReadFile on log file handles. Prioritize patching in multi-user environments and enterprise workstations.

Organizations using unpatched Windows 11 23H2 or older builds should prioritize patching, especially where system availability is critical.

Based on reporting by Cyber Security News.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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