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    2 vulnerabilities found for Windows OS by Microsoft

    CVE-2026-2636 (GCVE-0-2026-2636)

    Vulnerability from nvd – Published: 2026-02-25 18:57 – Updated: 2026-02-26 15:56
    VLAI
    Title
    Denial of Service in Microsoft OS
    Summary
    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.
    Severity
    5.5 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-159 - Improper Handling of Invalid Use of Special Elements
    Assigner
    References
    Impacted products
    Vendor Product Version
    Microsoft Windows OS Affected: 0 , < 25H2 (semver)
    Affected: 0 , ≤ 1123h2 (semver)
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2026-2636 (GCVE-0-2026-2636)

    Vulnerability from cvelistv5 – Published: 2026-02-25 18:57 – Updated: 2026-02-26 15:56
    VLAI
    Title
    Denial of Service in Microsoft OS
    Summary
    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.
    Severity
    5.5 (Medium)
    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    SSVC
    Exploitation: none Automatable: no Technical Impact: partial
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-159 - Improper Handling of Invalid Use of Special Elements
    Assigner
    References
    Impacted products
    Vendor Product Version
    Microsoft Windows OS Affected: 0 , < 25H2 (semver)
    Affected: 0 , ≤ 1123h2 (semver)
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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