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.
Attack profile
How easy it is to exploit
- Attack vector
- Local
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Windows Hyper-V Elevation of Privilege Vulnerability
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
- Record
CVE-2026-40402- CVSS 3.1
- 9.3 Critical
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 - Weakness
- CWE-416
- Updated
- 2026-11-02
EUVDEUVD-2026-29663
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
- Record
EUVD-2026-29663- CVSS 3.1
- 9.3 Critical
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 - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-h659-hh52-mv97
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.
- Record
GHSA-h659-hh52-mv97- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-416
- Updated
- 2026-11-02
NVD
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
- Record
CVE-2026-40402- CVSS 3.1
- 9.3 Critical
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H - Weakness
- CWE-416
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-40402 is a critical vulnerability (CVSS 9.3) in Microsoft Windows 11 Version 23h2, published May 12, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.33%, the 26th percentile. No source names a fixed version.