Windows Hyper-V
CVE-2026-40402 — Windows Hyper-V Elevation of Privilege Vulnerability
Executive Summary
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
Overview
9.3
CVSS CRITICAL
Critical
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Changed
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
High
EXPLOIT CODE MATURITY
Unproven
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 8.1
EPSS Score
0.00332
probability of exploitation in the next 30 days
0.24839 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
2 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 11 Version 23H2 for ARM64-based Systems | 5087420 (Security Update) |
Critical | Elevation of Privilege | Yes |
| Windows 11 Version 23H2 for x64-based Systems | 5093998 (Security Update) |
Critical | Elevation of Privilege | Yes |
Patches
2 patches
| Article | Type | Restart |
|---|---|---|
5087420 |
Security Update | Yes |
5093998 |
Security Update | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
References
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