Improper Access Control in Gigabyte Control Center MBStorage Module

Executive Summary

CVE-2026-9492 is an improper access control vulnerability in the MBStorage DRAM lighting control module of the Gigabyte Control Center (GCC).

Authenticated local attackers can exploit this flaw by sending specially crafted IOCTL commands through the MyPortIO_x64.sys driver, which is part of the module.

This allows attackers to arbitrarily read and write physical memory and gain kernel-level privileges on the affected system.

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Detection Guidance

Detecting this vulnerability requires checking for the presence of the vulnerable Gigabyte Control Center (GCC) software and the specific driver associated with the flaw. Since this is a local privilege escalation vulnerability, detection focuses on system-level checks rather than network scans.

• Check if Gigabyte Control Center (GCC) is installed on the system. This can typically be done by looking for the application in the installed programs list or searching for its installation directory.
• Verify the version of the MBStorage DRAM lighting control module. The vulnerable versions are 26.02.10.01 and earlier. You can check the version by navigating to the module's properties or using file version commands.
• Look for the presence of the vulnerable driver MyPortIO_x64.sys. This can be done using the following command in an elevated Command Prompt: 'dir C:\Windows\System32\drivers\MyPortIO_x64.sys'. If the file exists, the system may be vulnerable.
• Check for the driver's digital signature and version information. Use the command: 'sigcheck -v C:\Windows\System32\drivers\MyPortIO_x64.sys' (requires Sysinternals Suite). This will help confirm if the driver is the vulnerable version.

If the system has the vulnerable driver and module version, it is at risk. The recommended action is to update the MBStorage module to version 26.06.03.01 or later.

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Impact Analysis

This vulnerability can have severe impacts because it allows an authenticated local attacker to gain kernel-level privileges.

With kernel-level access, an attacker can bypass many security controls, manipulate system memory arbitrarily, and potentially take full control of the affected system.

This could lead to unauthorized access to sensitive data, system instability, or the installation of persistent malicious software.

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Compliance Impact

This vulnerability can significantly impact compliance with standards and regulations such as GDPR and HIPAA due to its potential to allow unauthorized access to sensitive data and system privileges.

• GDPR: The vulnerability enables arbitrary read/write operations on physical memory, which could lead to unauthorized access to personal data stored in memory. Under GDPR, organizations must protect personal data from unauthorized access, and a breach of this nature could result in non-compliance, leading to fines and legal consequences.
• HIPAA: For organizations handling protected health information (PHI), this vulnerability poses a risk of unauthorized access to sensitive patient data. HIPAA requires strict access controls and safeguards to protect PHI. Exploitation of this vulnerability could lead to a breach of PHI, resulting in violations of HIPAA's Security Rule and Privacy Rule.
• General security standards: The vulnerability allows attackers to gain kernel-level privileges, which can compromise the integrity and confidentiality of systems. Compliance frameworks like ISO 27001, NIST, and others require organizations to implement proper access controls and protect against privilege escalation attacks. Failure to mitigate this vulnerability could result in non-compliance with these standards.

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Mitigation Strategies

To mitigate the CVE-2026-9492 vulnerability, users should update the MBStorage DRAM lighting control module within Gigabyte Control Center to version 26.06.03.01 or later.

This update addresses the improper access control flaw that allows authenticated local attackers to send crafted IOCTL commands through the MyPortIO_x64.sys driver, preventing arbitrary read/write operations on physical memory and the escalation to kernel-level privileges.

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