CVE-2026-9492: Gigabyte Control Center Privilege Escalation

CVE-2026-9492 Overview

CVE-2026-9492 is an Improper Access Control vulnerability [CWE-782] affecting the MBStorage DRAM lighting control module within Gigabyte Control Center (GCC), developed by GIGABYTE Technology. The flaw resides in the bundled MyPortIO_x64.sys kernel driver, which exposes IOCTL handlers without adequate access restrictions. Authenticated local attackers can issue crafted IOCTL requests to read and write arbitrary physical memory. Successful exploitation yields kernel-level privileges on the affected host.

Critical Impact
Local authenticated users can escalate to kernel-level code execution through arbitrary physical memory read/write primitives exposed by the MyPortIO_x64.sys driver.

Affected Products

Gigabyte Control Center (GCC)
MBStorage DRAM lighting control module
MyPortIO_x64.sys kernel driver bundled with GCC

Discovery Timeline

2026-07-13 - CVE-2026-9492 published to NVD
2026-07-14 - Last updated in NVD database

Technical Details for CVE-2026-9492

Vulnerability Analysis

The MBStorage DRAM lighting control module ships the MyPortIO_x64.sys driver to interact with low-level hardware for RGB and DRAM control. The driver exposes an IOCTL interface that permits direct physical memory access operations. Access control on this interface is insufficient, allowing any authenticated local user to send the affected IOCTL codes.

Because the driver operates in kernel mode, arbitrary physical memory reads and writes translate directly into full system compromise. Attackers can locate and modify kernel structures such as EPROCESS token pointers to elevate a low-privileged process to SYSTEM. The issue is representative of a broader class of vulnerable OEM utility drivers repurposed as Bring Your Own Vulnerable Driver (BYOVD) primitives.

Root Cause

The root cause is the exposed IOCTL functionality inside MyPortIO_x64.sys that maps and manipulates physical memory without validating caller privilege or restricting the scope of memory regions accessible through the driver. The driver treats any process holding a handle to the device object as authorized to issue privileged memory operations.

Attack Vector

Exploitation requires local access and authenticated user privileges. An attacker opens a handle to the driver's device object, then issues the vulnerable IOCTL code with a controlled input buffer describing the target physical address. The driver performs the requested read or write in kernel context and returns results to user mode. No user interaction is required beyond executing the exploit binary.

No public proof-of-concept code has been referenced in the advisory. Refer to the TW CERT Security Advisory for vendor coordination details.

Detection Methods for CVE-2026-9492

Indicators of Compromise

Presence of MyPortIO_x64.sys loaded outside of legitimate GIGABYTE Control Center installations, particularly from non-standard file paths.
Unexpected CreateFile handles opened against the MyPortIO device object by processes that are not part of GCC.
Loading of MyPortIO_x64.sys on servers or endpoints where GIGABYTE motherboard utilities are not required.

Detection Strategies

Inventory endpoints for the MyPortIO_x64.sys driver hash and flag installations on systems that do not require Gigabyte Control Center.
Monitor kernel driver load events (Windows Event ID 6, Sysmon Event ID 6) for MyPortIO_x64.sys and correlate with the loading process signer.
Alert on user-mode processes opening device handles associated with the driver followed by DeviceIoControl calls carrying large physical address parameters.

Monitoring Recommendations

Enable Microsoft Vulnerable Driver Blocklist and audit its enforcement logs on all Windows endpoints.
Track privilege escalation patterns such as a non-elevated process spawning SYSTEM-level child processes shortly after driver interaction.
Aggregate driver load telemetry into a centralized data lake to hunt retrospectively for BYOVD activity involving MyPortIO_x64.sys.

How to Mitigate CVE-2026-9492

Immediate Actions Required

Uninstall Gigabyte Control Center on systems that do not require DRAM lighting control, especially servers and workstations in sensitive environments.
Add MyPortIO_x64.sys to the Microsoft Vulnerable Driver Blocklist and confirm enforcement through Windows Security policy.
Restrict local logon rights to reduce the population of users able to invoke the vulnerable IOCTL interface.

Patch Information

Refer to the TW CERT Security Advisory and the TW CERT Incident Report for the latest vendor guidance. Apply the updated Gigabyte Control Center release from GIGABYTE Technology once available and verify that the bundled MyPortIO_x64.sys driver is replaced with a patched version.

Workarounds

Remove or rename MyPortIO_x64.sys on hosts where Gigabyte Control Center features are not in use.
Enforce Windows Defender Application Control (WDAC) policies that block loading of unsigned or known-vulnerable drivers.
Apply the principle of least privilege so that only trusted administrators can install or interact with OEM utilities that ship kernel drivers.

bash

# Enable Microsoft Vulnerable Driver Blocklist via PowerShell
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Control\CI\Config" -Name "VulnerableDriverBlocklistEnable" -Value 1 -Type DWord

# Verify driver presence on the host
Get-ChildItem -Path C:\Windows\System32\drivers\ -Filter MyPortIO_x64.sys -ErrorAction SilentlyContinue