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    CVE-2026-2636

    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.

    Published:Feb 25, 2026
    Last Modified:Apr 18, 2026
    EPS:Feb 25, 2026
    EPSS Score:0.00049
    CVSS Score:5.5

    Affected Products

    Vendor
    Microsoft
    Product
    Windows
    Vendor
    Microsoft
    Product
    Windows 11
    Vendor
    Microsoft
    Product
    Windows 11 23h2
    Vendor
    Microsoft
    Product
    Windows 11 25h2
    Vendor
    Microsoft
    Product
    Windows Server 2025

    Exploits

    https://github.com/oxfemale/CVE-2026-2636_PoChttps://github.com/uname1able/CVE-2026-2636

    Common Attack Pattern Enumeration and Classification (CAPEC)

    No CAPEC recorded yet

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High