Windows USB Print Driver Race Condition Privilege Escalation

Executive Summary

CVE-2026-49802 is a race condition vulnerability in the Windows USB Print Driver. 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 the driver. By doing so, the attacker can elevate their privileges on the affected system, gaining higher levels of access than intended.

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Impact Analysis

If you are using a system with the affected Windows USB Print Driver, this vulnerability could have several impacts:

• An attacker with local access to your system could exploit this vulnerability to gain elevated privileges, such as administrative rights.
• With elevated privileges, the attacker could execute arbitrary code, install malicious software, or access sensitive data on your system.
• The attacker could also disrupt system operations, leading to potential downtime or loss of functionality.

This vulnerability is particularly concerning in environments where multiple users have local access to the same system, such as shared workstations or enterprise networks.

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Compliance Impact

This vulnerability could impact compliance with several common standards and regulations, depending on the context of its exploitation:

• GDPR (General Data Protection Regulation): If the vulnerability is exploited to access or exfiltrate personal data of EU citizens, it could lead to a breach of GDPR. Organizations may face fines and penalties for failing to protect personal data adequately.
• HIPAA (Health Insurance Portability and Accountability Act): In healthcare environments, if the vulnerability is used to access protected health information (PHI), it could result in a HIPAA violation. This may lead to legal consequences and financial penalties for the organization.
• Other standards like ISO 27001, NIST, or PCI DSS may also be affected if the vulnerability leads to unauthorized access or data breaches. Compliance with these standards often requires maintaining the integrity and security of systems, which this vulnerability undermines.

Organizations should assess the risk posed by this vulnerability and take appropriate measures to mitigate it to avoid potential compliance violations.

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Mitigation Strategies

Apply the security update provided by Microsoft to address the race condition in the Windows USB Print Driver.

Ensure that only trusted users have local access to the system, as the vulnerability requires local privileges to exploit.

Monitor the Microsoft Security Response Center (MSRC) for official patches or workarounds specific to CVE-2026-49802.

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