Heap-based Buffer Overflow in Windows USB Video Driver

Executive Summary

CVE-2026-49804 is a heap-based buffer overflow vulnerability in the Windows USB Video Driver. This flaw allows an unauthorized attacker to elevate their privileges on a targeted system.

The vulnerability requires physical access to the system to exploit, meaning the attacker must have direct interaction with the device. Once exploited, the attacker can gain higher-level privileges, potentially taking full control of the affected system.

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Detection Guidance

The provided context does not include specific detection methods or commands for identifying the presence of CVE-2026-49804 on a network or system. This vulnerability involves a heap-based buffer overflow in the Windows USB Video Driver, which requires physical access to exploit. Detection may involve checking for vulnerable driver versions or monitoring for unusual USB device behavior, but no explicit tools or commands are mentioned in the available resources.

To detect this vulnerability, you may need to refer to Microsoft's official guidance or security updates for specific indicators of compromise or vulnerable driver versions. Regularly updating Windows and monitoring Microsoft's security advisories is recommended.

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Impact Analysis

If exploited, this vulnerability can have severe consequences for affected users or organizations.

• An attacker with physical access to a vulnerable system could elevate their privileges, gaining unauthorized administrative control.
• This could lead to unauthorized access to sensitive data, installation of malware, or disruption of system operations.
• The impact is particularly high in environments where physical security is a concern, such as shared workstations or public-facing devices.

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Compliance Impact

This vulnerability could have implications for compliance with various standards and regulations, depending on the context of its exploitation.

• GDPR: If the vulnerability leads to unauthorized access to personal data of EU citizens, it could result in a breach of GDPR requirements, particularly Article 32 (security of processing) and Article 5 (data protection principles). Organizations may face fines or legal consequences if they fail to mitigate such risks.
• HIPAA: For healthcare organizations, exploitation of this vulnerability could lead to unauthorized access to protected health information (PHI). This would violate the HIPAA Security Rule, which mandates safeguards for electronic PHI. Non-compliance could result in penalties.
• Other standards: Compliance frameworks like ISO 27001, NIST, or PCI DSS may also be affected if the vulnerability undermines security controls related to access management, data protection, or system integrity.

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

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Mitigation Strategies

Based on the provided context, the following steps can be taken to mitigate CVE-2026-49804:

• Apply the latest security updates from Microsoft as soon as they are available. This vulnerability is addressed in Microsoft's security patches, and updating the system will resolve the issue.
• Restrict physical access to systems to prevent unauthorized attackers from exploiting the vulnerability, as it requires physical access to the device.
• Monitor Microsoft's security advisory (MSRC) for additional guidance or workarounds if patches are not immediately available.

For the most accurate and up-to-date mitigation steps, refer to the official Microsoft security update guide linked in the resources.

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