CVE-2026-40402: Windows Hyper-V Elevation of Privilege Vulnerability
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
Other sources
Windows Hyper-V Elevation of Privilege Vulnerability
— Microsoft
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7079Patch KB5087420 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.20348.5139Fixed in 10.0.20348.5074Patch KB5087424 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 10.0.22631.7219Patch KB5093998
Event History
Frequently Asked Questions
What is the severity of CVE-2026-40402?
CVE-2026-40402 has a critical severity level due to its potential to allow unauthorized local privilege escalation.
How do I fix CVE-2026-40402?
To fix CVE-2026-40402, apply the latest security patches provided by Microsoft for affected systems.
What systems are affected by CVE-2026-40402?
CVE-2026-40402 affects Windows Server 2022 and Windows 11 23H2 versions.
Can I exploit CVE-2026-40402 remotely?
No, CVE-2026-40402 requires local access to exploit the vulnerability.
Is there a workaround for CVE-2026-40402?
Currently, there are no known workarounds for CVE-2026-40402; patching is the recommended solution.