Elevation of Privilege in Windows Hyper-V by Microsoft
CVE-2026-40402

9.3CRITICAL

Key Information:

Vendor

Microsoft
Status
Windows 11 Version 22h3
Windows 11 Version 23h2
Windows Server 2022
Vendor
CVE Published:
12 May 2026

What is CVE-2026-40402?

A vulnerability exists in Windows Hyper-V that allows an unauthorized user to exploit a use after free condition, potentially enabling privilege escalation locally. This can result in increased access rights, allowing the attacker to gain control over affected systems. It is crucial for administrators to be aware of this vulnerability to implement necessary patches and protect against unauthorized access.

Affected Version(s)

Windows 11 version 22H3 ARM64-based Systems 10.0.22631.0 < 10.0.22631.7079

Windows 11 Version 23H2 x64-based Systems 10.0.22631.0 < 10.0.22631.7079

Windows Server 2022 x64-based Systems 10.0.20348.0 < 10.0.20348.5139

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE...
vendor-advisorypatch

CVSS V3.1

Score:
9.3
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.