CVE-2026-40402

CRITICAL

Microsoft Windows 11 version 22H3 - Windows Hyper-V Elevation of Privilege Vulnerability

Title source: rule
STIX 2.1

Description

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

References (1)

Core 1
Core References
Vendor Advisory vendor-advisory patch
Windows Hyper-V Elevation of Privilege Vulnerability
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402

Scores

CVSS v3 9.3
EPSS 0.0006
EPSS Percentile 17.9%
Attack Vector LOCAL
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact total

Details

CWE
CWE-416
Status published
Products (5)
Microsoft/Windows 11 version 22H3 10.0.22631.0 - 10.0.22631.7079
Microsoft/Windows 11 Version 23H2 10.0.22631.0 - 10.0.22631.7079
Microsoft/Windows Server 2022 10.0.20348.0 - 10.0.20348.5139
microsoft/windows_11_23h2 < 10.0.22631.7079 (2 CPE variants)
microsoft/windows_server_2022 < 10.0.20348.5074
Published May 12, 2026
Tracked Since May 12, 2026