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CVE-2026-27929: Windows LUAFV Privilege Elevation Vulnerability

CVE-2026-27929 · published 6 months ago

Summary

An attacker can take control of your computer while you're using certain Windows features, potentially gaining access to sensitive information or making unauthorized changes. This is a serious issue, especially for organizations that rely on Windows features like User Account Control (UAC) to manage user permissions. To protect your system, make sure to keep your Windows operating system and all software up to date with the latest security patches.

What to do

Update microsoft windows 10 version 1607 to version 10.0.14393.9060 or later.
Update microsoft windows 10 version 1809 to version 10.0.17763.8644 or later.
Update microsoft windows 10 version 21h2 to version 10.0.19044.7184 or later.
Update microsoft windows 10 version 22h2 to version 10.0.19045.7184 or later.
Update microsoft windows 11 version 22h3 to version 10.0.22631.6936 or later.
Update microsoft windows 11 version 23h2 to version 10.0.22631.6936 or later.
Update microsoft windows 11 version 24h2 to version 10.0.26100.8246 or later.
Update microsoft windows 11 version 25h2 to version 10.0.26200.8246 or later.
Update microsoft windows 11 version 26h1 to version 10.0.28000.1836 or later.
Update microsoft windows server 2012 to version 6.2.9200.26026 or later.
Update microsoft windows server 2012 (server core installation) to version 6.2.9200.26026 or later.
Update microsoft windows server 2012 r2 to version 6.3.9600.23132 or later.
Update microsoft windows server 2012 r2 (server core installation) to version 6.3.9600.23132 or later.
Update microsoft windows server 2016 to version 10.0.14393.9060 or later.
Update microsoft windows server 2016 (server core installation) to version 10.0.14393.9060 or later.
Update microsoft windows server 2019 to version 10.0.17763.8644 or later.
Update microsoft windows server 2019 (server core installation) to version 10.0.17763.8644 or later.
Update microsoft windows server 2022 to version 10.0.20348.5020 or later.
Update microsoft windows server 2022, 23h2 edition (server core installation) to version 10.0.25398.2274 or later.
Update microsoft windows server 2025 to version 10.0.26100.32690 or later.
Update microsoft windows server 2025 (server core installation) to version 10.0.26100.32690 or later.
Update microsoft windows_10_1607 to version 10.0.14393.9060 or later.
Update microsoft windows_10_1809 to version 10.0.17763.8644 or later.
Update microsoft windows_10_21h2 to version 10.0.19044.7184 or later.
Update microsoft windows_10_22h2 to version 10.0.19045.7184 or later.
Update microsoft windows_11_23h2 to version 10.0.22631.6936 or later.
Update microsoft windows_11_24h2 to version 10.0.26100.8246 or later.
Update microsoft windows_11_25h2 to version 10.0.26200.8246 or later.
Update microsoft windows_11_26h1 to version 10.0.28000.1836 or later.
Update microsoft windows_server_2016 to version 10.0.14393.9060 or later.
Update microsoft windows_server_2019 to version 10.0.17763.8644 or later.
Update microsoft windows_server_2022 to version 10.0.20348.5020 or later.
Update microsoft windows_server_2022_23h2 to version 10.0.25398.2274 or later.
Update microsoft windows_server_2025 to version 10.0.26100.32690 or later.

Affected software

Vendor	Product	Affected versions
microsoft	windows 10 version 1607	< 10.0.14393.9060
microsoft	windows 10 version 1809	< 10.0.17763.8644
microsoft	windows 10 version 21h2	< 10.0.19044.7184
microsoft	windows 10 version 22h2	< 10.0.19045.7184
microsoft	windows 11 version 22h3	< 10.0.22631.6936
microsoft	windows 11 version 23h2	< 10.0.22631.6936
microsoft	windows 11 version 24h2	< 10.0.26100.8246
microsoft	windows 11 version 25h2	< 10.0.26200.8246
microsoft	windows 11 version 26h1	< 10.0.28000.1836
microsoft	windows server 2012	< 6.2.9200.26026
microsoft	windows server 2012 (server core installation)	< 6.2.9200.26026
microsoft	windows server 2012 r2	< 6.3.9600.23132
microsoft	windows server 2012 r2 (server core installation)	< 6.3.9600.23132
microsoft	windows server 2016	< 10.0.14393.9060
microsoft	windows server 2016 (server core installation)	< 10.0.14393.9060
microsoft	windows server 2019	< 10.0.17763.8644
microsoft	windows server 2019 (server core installation)	< 10.0.17763.8644
microsoft	windows server 2022	< 10.0.20348.5020
microsoft	windows server 2022, 23h2 edition (server core installation)	< 10.0.25398.2274
microsoft	windows server 2025	< 10.0.26100.32690
microsoft	windows server 2025 (server core installation)	< 10.0.26100.32690
microsoft	windows_10_1607	< 10.0.14393.9060 `cpe:2.3:o:microsoft:windows_10_1607:::::::x64:*`
microsoft	windows_10_1809	< 10.0.17763.8644 `cpe:2.3:o:microsoft:windows_10_1809:::::::x64:*`
microsoft	windows_10_21h2	< 10.0.19044.7184 `cpe:2.3:o:microsoft:windows_10_21h2:::::::arm64:*`
microsoft	windows_10_22h2	< 10.0.19045.7184 `cpe:2.3:o:microsoft:windows_10_22h2:::::::arm64:*`
microsoft	windows_11_23h2	< 10.0.22631.6936 `cpe:2.3:o:microsoft:windows_11_23h2:::::::arm64:*`
microsoft	windows_11_24h2	< 10.0.26100.8246 `cpe:2.3:o:microsoft:windows_11_24h2:::::::arm64:*`
microsoft	windows_11_25h2	< 10.0.26200.8246 `cpe:2.3:o:microsoft:windows_11_25h2:::::::arm64:*`
microsoft	windows_11_26h1	< 10.0.28000.1836 `cpe:2.3:o:microsoft:windows_11_26h1:::::::arm64:*`
microsoft	windows_server_2012	r2 `cpe:2.3:o:microsoft:windows_server_2012:-:::::::*`
microsoft	windows_server_2016	< 10.0.14393.9060 `cpe:2.3:o:microsoft:windows_server_2016::::::::`
microsoft	windows_server_2019	< 10.0.17763.8644 `cpe:2.3:o:microsoft:windows_server_2019::::::::`
microsoft	windows_server_2022	< 10.0.20348.5020 `cpe:2.3:o:microsoft:windows_server_2022::::::::`
microsoft	windows_server_2022_23h2	< 10.0.25398.2274 `cpe:2.3:o:microsoft:windows_server_2022_23h2::::::::`
microsoft	windows_server_2025	< 10.0.26100.32690 `cpe:2.3:o:microsoft:windows_server_2025::::::::`

Original advisory text

Windows LUA File Virtualization Filter Driver Elevation of Privilege Vulnerability

Time-of-check time-of-use (toctou) race condition in Windows LUAFV allows an authorized attacker to elevate privileges locally.

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-27929 Vendor Advisory

Fix within

Internet-facing 14 days

Internal At next upgrade

Not known to be exploited
Needs hands-on effort to exploit
Gives an attacker full control

Severity

7.0 High

Exploitation

<1% chance of attack within 30 days

Type

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition

Timeline

Published14 Apr 2026

Updated31 Oct 2026

First seen14 Apr 2026

Sources

CVE-2026-27929 · NVD

CVE-2026-27929 · MITRE

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