Critical [CVE-2026-40402] Windows Hyper-V Elevation of Privilege Vulnerability
This critical-severity Microsoft Server advisory covers CVE-2026-40402 affecting Windows Server 2022.
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Summary
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
Affected product named by the advisory: Windows Server 2022.
- Windows 11 version 23H2 10.0.22631.0 before 10.0.22631.7079
- Windows 11 Version 23H2 10.0.22631.0 before 10.0.22631.7219
- Windows Server 2022 10.0.20348.0 before 10.0.20348.5139
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
- 10.0.22631.7079
- 10.0.22631.7219
- 10.0.20348.5139
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
Mitigation
Upgrade to a fixed release: 10.0.22631.7079, 10.0.22631.7219, 10.0.20348.5139. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 2 hours ago·verify at source
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