Critical severity9.3NVD Advisory· Published May 12, 2026· Updated May 15, 2026
CVE-2026-40402
CVE-2026-40402
Description
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
Patches
0No patches discovered yet.
Vulnerability mechanics
AI mechanics synthesis has not run for this CVE yet.
References
1- msrc.microsoft.com/update-guide/vulnerability/CVE-2026-40402nvdVendor Advisory
News mentions
5- Microsoft Patches 138 Vulnerabilities, Including DNS and Netlogon RCE FlawsThe Hacker News · May 13, 2026
- Patch Tuesday - May 2026Rapid7 Blog · May 13, 2026
- Microsoft May 2026 Patch Tuesday: Many fixes, but no zero-daysHelp Net Security · May 12, 2026
- Microsoft May 2026 Patch Tuesday fixes 120 flaws, no zero-daysBleepingComputer · May 12, 2026
- May 2026 Patch Tuesday: 30 Critical Vulnerabilities Among 130 CVEsCrowdStrike Blog