CVE-2026-40402

Windows Hyper-V Elevation of Privilege Vulnerability

Published May 12, 2026 CVSS 3.1 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
Use after free in Windows Hyper-V allows an unauthorized 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
CPEs cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*: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 22h3
Microsoft windows 11 23h2
Vendors & Products Microsoft windows 11 22h3
Microsoft windows 11 23h2
Type Values Removed Values Added
Description Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
Title Windows Hyper-V Elevation of Privilege Vulnerability
First Time appeared Microsoft
Microsoft windows 11 23h2
Microsoft windows Server 2022
Weaknesses CWE-416
CPEs cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:arm64:*
cpe:2.3:o:microsoft:windows_11_23H2:*:*:*:*:*:*:x64:*
cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
Vendors & Products Microsoft
Microsoft windows 11 23h2
Microsoft windows Server 2022
References
Metrics cvssV3_1

{'score': 9.3, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
microsoft
Published
Updated
Aug 10, 2026, 3:13 PM
Reserved
Apr 13, 2026, 12:27 AM
Status
Analyzed
Published
May 12, 2026, 6:17 PM
Modified
Nov 11, 2026, 8:10 PM