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CVE-2026-40402Critical

Windows Hyper-V Elevation of Privilege Vulnerability

MSRC advisory NVD CVE.org

Assessment

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

Severity
Critical
CVSS base score
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
Impact
Elevation of Privilege
EPSS, next 30 days
0.4%Higher than 27.7% of scored CVEs · FIRST model run 29 Sep 2026 · about EPSS
Public exploit code
No Nuclei template lists it
Exploitability
Exploitation Less Likely
Publicly disclosed
No
Customer action
Required: apply the update
Component
Windows Hyper-V
Weakness
CWE-416: Use After Free
Issued by
Microsoft
Published
12 May 2026 · May 2026
Last revised
12 May 2026

Updates that fix it

4 KBs
KBTypeRestartApplies toOther CVEs
KB5087420 Security Update Required Windows 11 Version 23H2 for ARM64-based Systems All CVEs in KB5087420
KB5087424 Security Hotpatch Update Required Windows Server 2022, Windows Server 2022 (Server Core installation) All CVEs in KB5087424
KB5087545 Security Update Required Windows Server 2022, Windows Server 2022 (Server Core installation) All CVEs in KB5087545
KB5093998 Security Update Required Windows 11 Version 23H2 for x64-based Systems All CVEs in KB5093998

Affected products

Windows
4 affected products
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