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CVE-2026-2636— Denial of Service in Microsoft OS

Quick assessment

Affected
Microsoft Windows OS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows是美国微软（Microsoft）公司的一套个人设备使用的操作系统。 Microsoft Windows存在安全漏洞，该漏洞源于CLFS.sys驱动程序中特殊元素无效使用处理不当，可能导致无特权用户触发系统崩溃。

CVSS 5.5 · Medium EPSS 0.43% · P34

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2026-2636

Vulnerability Information
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Vulnerability Title
Denial of Service in Microsoft OS
Source: CVE Program / CVE List V5
Vulnerability Description
This vulnerability is caused by a CWE‑159: "Improper Handling of Invalid Use of Special Elements" weakness, 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 Windows Server 2025. Windows 25H2 (released in September) was released with the patch. Windows 1123h2 and earlier versions remain vulnerable.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特殊元素净化处理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows是美国微软（Microsoft）公司的一套个人设备使用的操作系统。 Microsoft Windows存在安全漏洞，该漏洞源于CLFS.sys驱动程序中特殊元素无效使用处理不当，可能导致无特权用户触发系统崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Microsoft Windows OS 0 ~ 25H2 -

II. Public POCs for CVE-2026-2636

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III. Intelligence Information for CVE-2026-2636

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IV. Related Vulnerabilities

Same vendor: Microsoft
Same weakness: CWE-159

V. Comments for CVE-2026-2636

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