VulnerabilityAnalyzed
CVE-2026-40402
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
CRITICAL 9.3EPSS 0.33%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.33%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
- CVSS 3.1
- 9.3 CRITICALCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- EPSS
- 0.33% probability · 26th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- microsoft/windows 11 23h2 · microsoft/windows server 2022
- Source
- secure@microsoft.com
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.