Integer Overflow in Windows Storage Spaces Direct

Executive Summary

CVE-2026-50299 is an integer overflow or wraparound vulnerability in Windows Storage Spaces Direct. This flaw allows an unauthorized attacker to execute arbitrary code on the affected system.

The vulnerability requires physical access to the target system to exploit, as indicated by the CVSS vector (AV:P, which stands for Attack Vector: Physical). This means the attacker must have direct physical access to the hardware to take advantage of the flaw.

Integer overflow or wraparound occurs when an arithmetic operation attempts to create a numeric value that is too large to be represented within the available storage space, leading to unexpected behavior or code execution.

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Impact Analysis

If exploited, this vulnerability can have severe consequences for affected systems.

• An attacker with physical access could execute arbitrary code on the system, potentially gaining full control over it.
• This could lead to unauthorized access to sensitive data stored on the system or the ability to install malware, backdoors, or other malicious software.
• The attacker could also disrupt system operations, causing downtime or data corruption in environments relying on Windows Storage Spaces Direct for storage management.

However, exploitation requires physical access, which limits the risk compared to remotely exploitable vulnerabilities.

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Compliance Impact

This vulnerability could impact compliance with several standards and regulations, depending on the context in which the affected system is used.

• GDPR (General Data Protection Regulation): If the system stores or processes personal data of EU citizens, a successful exploit could lead to unauthorized access or disclosure of that data. This would violate GDPR's requirements for data protection and could result in significant fines or legal action.
• HIPAA (Health Insurance Portability and Accountability Act): For organizations handling protected health information (PHI) in the U.S., exploitation of this vulnerability could lead to unauthorized access to PHI, violating HIPAA's security and privacy rules. This could result in penalties and mandatory corrective actions.
• Other standards like PCI DSS (Payment Card Industry Data Security Standard) could also be impacted if the system processes or stores payment card data. A breach could lead to non-compliance and potential revocation of payment processing capabilities.

While the vulnerability requires physical access, organizations must still assess their risk exposure, especially in environments where physical security controls may be insufficient or where sensitive data is involved.

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Detection Guidance

The provided context does not include specific detection methods or commands for identifying the vulnerability in Windows Storage Spaces Direct. Detection typically requires checking system configurations, installed patches, or using vulnerability scanning tools that support CVE-2026-50299.

Since this vulnerability involves a physical attack vector (AV:P in the CVSS vector), traditional network-based detection may not be applicable. You may need to verify the physical security of systems running Windows Storage Spaces Direct and ensure they are updated with the latest patches from Microsoft.

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Mitigation Strategies

• Apply the latest security updates from Microsoft for Windows Storage Spaces Direct. Refer to the Microsoft Update Guide for CVE-2026-50299 for patch details.
• Restrict physical access to systems running Windows Storage Spaces Direct, as the vulnerability requires physical access (AV:P in the CVSS vector).
• Monitor Microsoft's security advisories for additional guidance or workarounds if a patch is not immediately available.

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