CVE-2025-7029 is a vulnerability identified in the GIGABYTE UEFI-OverClockSmiHandler firmware component, specifically within the Software System Management Interrupt (SwSmi) handler identified by input value 0xB2. This handler processes power and thermal configuration data stored in NVRAM (OcSetup) and uses the RBX CPU register to derive pointers to OcHeader and OcData buffers. The vulnerability arises because the pointers derived from RBX are not validated before multiple structured memory writes are performed. This lack of validation allows a local attacker, who can control RBX, to corrupt System Management RAM (SMRAM) arbitrarily. Since SMRAM is a highly privileged memory region used by System Management Mode (SMM), corruption here can lead to privilege escalation, allowing an attacker to execute arbitrary code with SMM privileges. The vulnerability is classified under CWE-822 (Uncontrolled Pointer Dereference), indicating that pointer values are not properly checked before use. The CVSS v3.1 base score is 8.2, reflecting high severity, with attack vector local, low attack complexity, high privileges required, no user interaction, and impacts to confidentiality, integrity, and availability with scope change. The affected product version is 1.0.0 of GIGABYTE's UEFI-OverClockSmiHandler. No patches or known exploits are currently available or reported. The vulnerability was published on July 11, 2025, and reserved on July 2, 2025.

This vulnerability poses a significant risk to organizations using affected GIGABYTE firmware, as it allows a local attacker with elevated privileges to escalate to SMM privileges, which are the highest privilege level on x86 systems. Successful exploitation can lead to full system compromise, including bypassing operating system security controls, persistent malware installation at the firmware level, and potential theft or manipulation of sensitive data. The corruption of SMRAM can also cause system instability or denial of service. Given that SMM operates below the OS, traditional security tools may not detect such attacks, increasing the stealth and impact of exploitation. Organizations relying on GIGABYTE hardware with this firmware version, especially in critical infrastructure, data centers, or environments requiring high security, face increased risk of advanced persistent threats and firmware-level rootkits.

Since no patches are currently available, organizations should implement strict local access controls to prevent unauthorized users from gaining the high privileges required to exploit this vulnerability. Limit administrative and physical access to affected systems. Employ firmware integrity monitoring and secure boot mechanisms to detect unauthorized firmware modifications. Monitor system logs for unusual SMI activity or crashes that could indicate exploitation attempts. Once GIGABYTE releases a firmware update addressing this vulnerability, prioritize timely deployment. Additionally, consider isolating critical systems using this hardware from untrusted networks and users to reduce attack surface. Employ hardware-based security features such as Intel TXT or AMD SVM where applicable to provide additional layers of protection against firmware attacks.