CVE-2026-40402: CWE-416: Use After Free in Microsoft Windows 11 version 22H3
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
AI Analysis
Technical Summary
This vulnerability (CVE-2026-40402) involves a use-after-free condition in the Windows Hyper-V component of Windows 11 version 22H3 (build 10.0.22631.0). Exploitation requires local access with no privileges and no user interaction, and it can result in a complete elevation of privileges, impacting confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an unauthorized local attacker to elevate privileges, potentially gaining full control over the affected system. The vulnerability impacts confidentiality, integrity, and availability at a high level, as indicated by the CVSS score of 9.3.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402 to remediate this vulnerability.
CVE-2026-40402: CWE-416: Use After Free in Microsoft Windows 11 version 22H3
Description
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability (CVE-2026-40402) involves a use-after-free condition in the Windows Hyper-V component of Windows 11 version 22H3 (build 10.0.22631.0). Exploitation requires local access with no privileges and no user interaction, and it can result in a complete elevation of privileges, impacting confidentiality, integrity, and availability. Microsoft has published an official fix to address this issue.
Potential Impact
Successful exploitation allows an unauthorized local attacker to elevate privileges, potentially gaining full control over the affected system. The vulnerability impacts confidentiality, integrity, and availability at a high level, as indicated by the CVSS score of 9.3.
Mitigation Recommendations
An official fix is available from Microsoft. Users and administrators should apply the security update provided in the Microsoft advisory at https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402 to remediate this vulnerability.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- microsoft
- Date Reserved
- 2026-04-13T00:27:50.798Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- official-fix
- Vendor Advisory Urls
- [{"url":"https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402","vendor":"Microsoft"}]
Threat ID: 6a036554cbff5d861008c974
Added to database: 5/12/2026, 5:37:24 PM
Last enriched: 5/12/2026, 6:51:26 PM
Last updated: 5/13/2026, 4:47:48 AM
Views: 2
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