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

CVE-2026-40402

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

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

CRITICAL · CVSS 9.3 EPSS 0.00057
Schedule remediation
  • CVSS base score ≥ 7.0
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-416Use After Free
▤

Affected Products & Versions

2
microsoft windows 11 23h2< 10.0.22631.7079
microsoft windows server 2022< 10.0.20348.5074
▣

Scoring & Timeline

9.3
CRITICAL · CVSS v3.1 · secure@microsoft.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD12 May 2026 · 06:17 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

1
msrcCVE-2026-40402Elevation of Privilege
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