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Critical severity9.3NVD Advisory· Published May 12, 2026· Updated May 15, 2026

CVE-2026-40402

CVE-2026-40402

Description

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

Affected products

3
  • Microsoft/Windows 11 23h22 versions
    cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*+ 1 more
    • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:arm64:*range: <10.0.22631.7079
    • cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:x64:*range: <10.0.22631.7079
  • Microsoft/Windows Server 2003
    cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:*
    Range: <10.0.20348.5074

Patches

Vulnerability mechanics

References

1

News mentions

5