CVE-2026-40369

Windows Kernel Elevation of Privilege Vulnerability

Published May 12, 2026 CVSS 3.1 · 7.8 High EPSS 4.7% KEV · Not listed
Description
Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Untrusted pointer dereference in Windows Kernel allows an authorized attacker to elevate privileges locally. Heap-based buffer overflow in Windows Kernel allows an authorized attacker to elevate privileges locally.
Type Values Removed Values Added
First Time appeared Microsoft windows 11 25h2
CPEs cpe:2.3:o:microsoft:windows_11_2H2:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_11_25H2:*:*:*:*:*:*:x64:*
Vendors & Products Microsoft windows 11 2h2
Microsoft windows 11 25h2
Type Values Removed Values Added
CPEs cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_26h1:*:*:*:*:*:*:x64:*
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2025 (server Core Installation)
Vendors & Products Microsoft windows 11 24h2
Microsoft windows 11 25h2
Microsoft windows 11 26h1
Microsoft windows Server 2025 (server Core Installation)
Type Values Removed Values Added
Description Untrusted pointer dereference in Windows Kernel allows an authorized attacker to elevate privileges locally.
Title Windows Kernel Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft windows 11 24h2
Microsoft windows 11 26h1
Microsoft windows 11 2h2
Microsoft windows Server 2025
Weaknesses CWE-822
CPEs cpe:2.3:o:microsoft:windows_11_24H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_26H1:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_11_2H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 11 24h2
Microsoft windows 11 26h1
Microsoft windows 11 2h2
Microsoft windows Server 2025
References
Metrics cvssV3_1

{'score': 7.8, 'vector': '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'}