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CVE-2026-54127: Windows Hyper-V Elevation of Privilege Vulnerability

highCVSS 7.4CVE-2026-54127
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.

CSIRTS triage

vendor: Microsoftproduct: Windows Hyper-VPrivilege escalation
What
Use after free in Windows Hyper-V allows an unauthorized attacker to elevate privileges locally.
Who is affected
Deployments of Windows Hyper-V.
Urgency
Remediation is urgent due to the high severity and potential for privilege escalation.
Action
Apply the latest security patch for Windows Hyper-V.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.4
Published
2026-07-14
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-54127

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-54127coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Windows Hyper-V Elevation

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from Microsoft Security Response Center