Integer Underflow in Windows NTFS Leads to Local Code Execution

Executive Summary

CVE-2026-50308 is an integer underflow vulnerability in Windows NTFS. An integer underflow occurs when a mathematical operation results in a value smaller than the minimum value that can be stored, causing it to wrap around to a very large number. In this case, the flaw allows an unauthorized attacker to execute code locally on the affected system.

The vulnerability is classified as a local attack vector, meaning the attacker must have access to the system to exploit it. The CVSS v3.1 base score is 7.8, indicating a high severity level, with impacts on confidentiality, integrity, and availability.

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Detection Guidance

This vulnerability involves an integer underflow in Windows NTFS, which may not have direct detection commands. Ensure your Windows systems are updated with the latest security patches from Microsoft to mitigate this risk. Monitor for unusual system behavior or unauthorized code execution.

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Impact Analysis

If exploited, this vulnerability could have several impacts on you or your system:

• An attacker could execute arbitrary code on your system, potentially gaining control over it.
• The attacker could access, modify, or delete sensitive data stored on the system.
• The vulnerability could be used to install malware or other malicious software, leading to further compromise.
• Since the attack is local, the attacker would need some level of access to the system, but once exploited, the impact could be severe.

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Compliance Impact

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

• GDPR: If the vulnerability leads to unauthorized access or disclosure of personal data, it could result in a violation of GDPR. Organizations may face fines or penalties if they fail to protect personal data adequately.
• HIPAA: For organizations handling protected health information (PHI), exploitation of this vulnerability could lead to unauthorized access or disclosure of PHI, resulting in non-compliance with HIPAA requirements.
• Other standards like ISO 27001 or NIST frameworks may also be impacted, as they require organizations to maintain the confidentiality, integrity, and availability of information systems. Failure to patch or mitigate this vulnerability could be seen as a lapse in security controls.

Organizations should assess the risk posed by this vulnerability and take appropriate measures to mitigate it to maintain compliance with relevant regulations.

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Mitigation Strategies

Apply the security update provided by Microsoft to address CVE-2026-50308. The update can be found in the Microsoft Update Guide for this vulnerability.

• Ensure all Windows systems are updated to the latest patch level, as this vulnerability affects Windows NTFS.
• Monitor the Microsoft Security Response Center (MSRC) for any additional guidance or updates related to this CVE.

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