CVE-2026-40402 CRITICAL

CVE-2026-40402: Windows Hyper-V Elevation of Privilege Vulnerability

Vendor Microsoft
Product Windows 11 version 23H2
Weakness CWE-416
Published May 12, 2026
Last update June 9, 2026
View on NVD All CVEs

CVSS base score

9.3/10
Attack vector Local
Attack complexity Low
Privileges required None
User interaction None
Confidentiality High
Integrity High

CVSS 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

What the vulnerability does

01Description

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

Key dates

02Disclosure timeline

May 12, 2026 CVE published
June 9, 2026 Record updated