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Description

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

PUBLISHED Reserved 2026-04-13 | Published 2026-05-12 | Updated 2026-05-20 | Assigner microsoft




CRITICAL: 9.3CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C

Problem types

CWE-416: Use After Free

Product status

10.0.22631.0 (custom) before 10.0.22631.7079
affected

10.0.22631.0 (custom) before 10.0.22631.7079
affected

10.0.20348.0 (custom) before 10.0.20348.5139
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402 (Windows Hyper-V Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-40402)

nvd.nist.gov (CVE-2026-40402)

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