CVE-2026-40402 - Vulnerability Details - OpenCVE

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

No CVSS v4.0

Attack Vector Local

Attack Complexity Low

Privileges Required None

Scope Changed

Confidentiality Impact High

Integrity Impact High

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploitation none

Automatable no

Technical Impact total

Vendors	Products
Microsoft	Windows 11 22h3 Windows 11 23h2 Windows 11 23h2 Windows Server 2022

No data.

No data.

References

Link	Providers
https://www.spirityenterprise.com/virtual-ciso
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402

History

Wed, 13 May 2026 10:15:00 +0000

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}`

Wed, 13 May 2026 10:00:00 +0000

Type	Values Removed	Values Added
First Time appeared		Microsoft windows 11 22h3 Microsoft windows 11 23h2
Vendors & Products		Microsoft windows 11 22h3 Microsoft windows 11 23h2

Tue, 12 May 2026 17:30:00 +0000

Type	Values Removed	Values Added
Description		Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
Title		Windows Hyper-V Elevation of Privilege Vulnerability
First Time appeared		Microsoft Microsoft windows 11 23h2 Microsoft windows Server 2022
Weaknesses		CWE-416
CPEs		cpe:2.3:o:microsoft:windows_11_23H2:::::::arm64:* cpe:2.3:o:microsoft:windows_11_23H2:::::::x64:* cpe:2.3:o:microsoft:windows_server_2022::::::::
Vendors & Products		Microsoft Microsoft windows 11 23h2 Microsoft windows Server 2022
References		https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402
Metrics		cvssV3_1 `{'score': 9.3, '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'}`

MITRE

Status: PUBLISHED

Assigner: microsoft

Published: 2026-05-12T16:59:25.931Z

Updated: 2026-05-13T17:59:21.786Z

Reserved: 2026-04-13T00:27:50.798Z

Link: CVE-2026-40402

Vulnrichment

Updated: 2026-05-13T09:58:33.094Z

NVD

Status : Awaiting Analysis

Published: 2026-05-12T18:17:18.000

Modified: 2026-05-13T15:34:52.573

Link: CVE-2026-40402

Redhat

No data.

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