CVE-2026-40369: high-severity vulnerability in Microsoft Windows 11 Version 24H2
Windows Kernel Elevation of Privilege Vulnerability
Published · Updated
46Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 7.8epss 0.3%
from disclosure to weapon1 days
Published on NVDMay 12
1st PoC+1d
exploitation probability
0.3%top 75% of all CVEs
observed exploitation
nono source reports it
5 public exploit(s)
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Affected products
Microsoft · Windows 11 Version 24H2Microsoft · Windows 11 Version 25H2Microsoft · Windows 11 version 26H1Microsoft · Windows Server 2025Microsoft · Windows Server 2025 (Server Core installation)public PoCs found — 5
githubgithub.com/orinimron123/CVE-2026-40369-EXPLOIT★ 260githubgithub.com/piffd0s/ntoskrnl-metadata★ 3githubgithub.com/0xBlackash/CVE-2026-40369★ 1githubgithub.com/ercihan/CVE-2026-40369★ 0githubgithub.com/CCELEND/CVE-2026-40369★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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