CVE-2026-40402

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

Score

CVSS 3.1 9.3 Critical

Status

Analyzed - secure@microsoft.com

Published

2026-05-12

Last modified

2026-08-10

Weaknesses

CWE-416

Affected products

• Windows 11 23H2 (Microsoft)
• Windows 11 23h2 (Microsoft)
• Windows Server 2022 (Microsoft)

References

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