CVE-2026-40402

Windows Hyper-V Elevation of Privilege Vulnerability

State: Published
Severity: 9.3 Critical
Published: May 12, 2026
Updated: Aug 10, 2026
Reserved: Apr 13, 2026

Description

Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.

Scores

CVSS	Score	Vector	Source
3.1	9.3 Critical	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	microsoft

Weaknesses

CWE-416 Use After Free

Affected Products

Product	Versions
Windows 11 version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.7079Affected
Windows 11 Version 23H2Microsoft	10.0.22631.0 to before 10.0.22631.7219Affected
Windows Server 2022Microsoft	10.0.20348.0 to before 10.0.20348.5139Affected

References

Windows Hyper-V Elevation of Privilege Vulnerabilityvendor-advisorypatch

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