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High · 7.8 Exploitation more likely Public exploit CVE-2026-40369 EUVD-2026-29651GHSA-4qhv-qjg6-r699

Windows Kernel Elevation of Privilege Vulnerability

Published May 12, 2026 · Updated Nov 3, 2026 · Assigned by microsoft

Vendor: Microsoft Product: Windows 11 Version 24H2 Product: Windows 11 Version 25H2 Product: Windows 11 version 26H1 Product: Windows Server 2025 Product: Windows Server 2025 (Server Core installation) Platform: Windows

Description

Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Affected products

VendorProductAffectedFixed
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 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

Public exploits

Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.

Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.

GitHub 6 repositories

Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.

Advisories 3

References