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OpenAdvisories
High · 7.8 CVE-2026-40407 EUVD-2026-29667GHSA-6p5f-2v3f-hh8g

Windows Common Log File System Driver Elevation of Privilege Vulnerability

Published May 12, 2026 · Updated Aug 10, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Windows 10 Version 1607 Product: Windows 10 Version 1809 Product: Windows 10 Version 21H2 Product: Windows 10 Version 22H2 Product: Windows 11 version 23H2 Product: Windows 11 Version 24H2 Product: Windows 11 Version 25H2 Product: Windows 11 version 26H1 Product: Windows Server 2012 Product: Windows Server 2012 (Server Core installation) Product: Windows Server 2012 R2 Product: Windows Server 2012 R2 (Server Core installation) Product: Windows Server 2016 Product: Windows Server 2016 (Server Core installation) Product: Windows Server 2019 Product: Windows Server 2019 (Server Core installation) Product: Windows Server 2022 Product: Windows Server 2022, 23H2 Edition (Server Core installation) Product: Windows Server 2025 Product: Windows Server 2025 (Server Core installation) Platform: Windows

Description

Heap-based buffer overflow in Windows Common Log File System Driver allows an authorized attacker to elevate privileges locally.

Affected products

VendorProductAffectedFixed
Microsoft Windows 10 Version 1607 10.0.14393.0 – < 10.0.14393.9140 10.0.14393.9140
Microsoft Windows 10 Version 1809 10.0.17763.0 – < 10.0.17763.8755 10.0.17763.8755
Microsoft Windows 10 Version 21H2 10.0.19044.0 – < 10.0.19044.7291 10.0.19044.7291
Microsoft Windows 10 Version 22H2 10.0.19045.0 – < 10.0.19045.7417 10.0.19045.7417
Microsoft Windows 11 version 23H2 10.0.22631.0 – < 10.0.22631.7079, 10.0.22631.0 – < 10.0.22631.7219 10.0.22631.7079
Microsoft Windows 11 Version 24H2 10.0.26100.0 – < 10.0.26100.8457 10.0.26100.8457
Microsoft Windows 11 Version 25H2 10.0.26200.0 – < 10.0.26200.8457 10.0.26200.8457
Microsoft Windows 11 version 26H1 10.0.28000.0 – < 10.0.28000.2113 10.0.28000.2113
Microsoft Windows Server 2012 6.2.9200.0 – < 6.2.9200.26079 6.2.9200.26079
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 – < 6.2.9200.26079 6.2.9200.26079
Microsoft Windows Server 2012 R2 6.3.9600.0 – < 6.3.9600.23181 6.3.9600.23181
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 – < 6.3.9600.23181 6.3.9600.23181
Microsoft Windows Server 2016 10.0.14393.0 – < 10.0.14393.9140 10.0.14393.9140
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 – < 10.0.14393.9140 10.0.14393.9140
Microsoft Windows Server 2019 10.0.17763.0 – < 10.0.17763.8755 10.0.17763.8755
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 – < 10.0.17763.8755 10.0.17763.8755
Microsoft Windows Server 2022 10.0.20348.0 – < 10.0.20348.5139 10.0.20348.5139
Microsoft Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.0 – < 10.0.25398.2330 10.0.25398.2330
Microsoft Windows Server 2025 10.0.26100.0 – < 10.0.26100.32860 10.0.26100.32860
Microsoft Windows Server 2025 (Server Core installation) 10.0.26100.0 – < 10.0.26100.32860 10.0.26100.32860

Advisories 2

References