CVE-2025-55328

7.8

Microsoft · Windows Hyper-V

A race condition in Windows Hyper-V allows a locally authorized attacker to gain elevated privileges through improper synchronization of shared resources.

Executive summary

A race condition vulnerability in Microsoft Windows Hyper-V enables a locally authenticated attacker to achieve privilege escalation, posing a significant risk to system integrity.

Vulnerability

This is a race condition (CWE-362) occurring within the Windows Hyper-V component. An attacker must have local access and low-level privileges to initiate the concurrent execution that leads to unauthorized privilege escalation.

Business impact

Successful exploitation of this vulnerability allows an attacker to escalate privileges to the level of the Hyper-V service, potentially gaining full control over the host operating system. With a CVSS score of 7.8, this flaw represents a high-severity risk that could lead to total system compromise, unauthorized data access, and the bypass of security boundaries within virtualized environments.

Remediation

Immediate Action: Apply the security updates provided by Microsoft in the official update guide to address the identified race condition.

Proactive Monitoring: Monitor system logs for unauthorized attempts to access sensitive Hyper-V management interfaces or unusual process execution patterns that suggest privilege escalation attempts.

Compensating Controls: Restrict local access to systems running the Hyper-V role to only essential administrative personnel to minimize the attack surface.

Exploitation status

Public Exploit Available: No (exploit_available: false)

Analyst recommendation

Given the potential for privilege escalation and the critical nature of the Hyper-V hypervisor, this vulnerability should be treated as a high priority for remediation. IT administrators must verify the build versions of all affected Windows systems and apply the corresponding security updates immediately to prevent potential exploitation.

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