CVE-2026-40402

Published: May 12, 2026Modified: Jun 17, 2026

9.3

Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploitability: 2.5 / Impact: 6.0

Source: secure@microsoft.com (Secondary)

Description

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

Affected (3)

Products: Microsoft: Windows 11 23h2, Windows Server 2022

2 products

Windows 11 23h2

Windows Server 2022

Configuration A

3 vulnerable

Vulnerable Software	Affected Versions
Microsoft Windows 11 23h2	Before 10.0.22631.7079
Microsoft Windows 11 23h2	Before 10.0.22631.7079
Microsoft Windows Server 2022	Before 10.0.20348.5074

Related CWEs

The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

References (1)

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402

Source: secure@microsoft.com

Vendor Advisory

Timeline

No history available yet.