Race Condition in Windows Win32K Elevates Privileges

Executive Summary

CVE-2026-54112 is a race condition vulnerability in the Windows Win32K component. A race condition occurs when multiple processes or threads access a shared resource without proper synchronization, leading to unpredictable behavior.

In this case, the vulnerability allows an authorized attacker with local access to exploit the improper synchronization in Win32K. This could enable the attacker to elevate their privileges on the affected system, gaining higher-level permissions than originally granted.

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Detection Guidance

This vulnerability is a local privilege escalation issue in Windows Win32K. Detection typically requires analyzing system logs for unusual privilege changes or monitoring for race condition exploits. Use Windows Event Viewer to check for Event ID 4688 (new process creation) and Event ID 4672 (special privileges assigned).

Commands to check for suspicious activity: 'wevtutil qe Security /q:*[System[(EventID=4688)]]' and 'wevtutil qe Security /q:*[System[(EventID=4672)]]'. Ensure all Windows systems are updated with the latest patches.

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Impact Analysis

If exploited, this vulnerability could have the following impacts:

• An attacker with local access to your system could gain elevated privileges, such as administrative or SYSTEM-level access.
• With elevated privileges, the attacker could execute arbitrary code, install malware, or modify system configurations.
• This could lead to unauthorized access to sensitive data, disruption of system operations, or further compromise of the affected system.

The vulnerability requires local access, meaning the attacker must already have some level of access to the system to exploit it.

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Compliance Impact

This vulnerability could impact compliance with common standards and regulations in the following ways:

• GDPR: If the affected system processes personal data of EU citizens, unauthorized access or privilege escalation could lead to a data breach. GDPR requires organizations to implement appropriate security measures to protect personal data, and failure to patch this vulnerability could be seen as a violation of these requirements.
• HIPAA: For organizations handling protected health information (PHI), this vulnerability could result in unauthorized access to sensitive patient data. HIPAA mandates safeguards to ensure the confidentiality, integrity, and availability of PHI, and exploitation of this vulnerability could constitute a breach of these safeguards.
• Other standards (e.g., ISO 27001, NIST): Many compliance frameworks require organizations to maintain secure systems and address vulnerabilities promptly. Failure to mitigate this vulnerability could result in non-compliance with these standards.

Organizations should assess their exposure to this vulnerability and apply patches or mitigations to maintain compliance with relevant regulations.

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Mitigation Strategies

Apply the security update provided by Microsoft to address CVE-2026-54112. This update will patch the race condition in Windows Win32K that allows privilege escalation.

• Visit the Microsoft Security Response Center (MSRC) update guide for CVE-2026-54112 to download and install the latest patch.
• Ensure all Windows systems are updated to the latest version to prevent exploitation of this vulnerability.
• Monitor Microsoft's official communications for any additional guidance or updates related to this CVE.

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