| CVE Number | Vulnerability | Product | Severity | Date |
|---|---|---|---|---|
| CVE-2026-40402 | Windows Hyper-V Elevation of Privilege Vulnerability | Windows 11, Windows Server | Critical | 29-05-2026 |
Technical Information
An unauthorized attacker could exploit a use-after-free vulnerability in Windows Hyper-V to elevate privileges locally by triggering the Hyper-V host kernel to access an invalid memory address from a low-privileged guest VM, potentially allowing the attacker to escape the guest boundary and gain SYSTEM-level access on the host.
Patch release date: May 12, 2026
Further information on this vulnerability is available at : CVE-2026-40402
Affected Software
Windows Server 2022,Windows Server 2022 (Server Core installation),
Windows 11 Version 23H2 for ARM64-based Systems,
Windows 11 Version 23H2 for x64-based Systems