A high-severity stack overflow vulnerability in MediaTek WLAN AP drivers could allow a local attacker with system-level access to escalate privileges.

This is a stack overflow (CWE-121) occurring within the WLAN access point driver. The flaw requires an attacker to already possess system-level privileges to trigger the incorrect bounds check, which then allows for further escalation or unauthorized control.

Successful exploitation of this vulnerability enables a local attacker to escalate privileges, potentially gaining full control over the affected network device. Given the CVSS score of 7.8, this poses a significant risk to network infrastructure integrity and confidentiality. Unauthorized access at this level could lead to persistent compromise of gateway hardware and potential lateral movement within the connected network.

Immediate Action: Apply the vendor-supplied security update (Patch ID: WCNCR00432659) provided in the October 2025 MediaTek security bulletin.

Proactive Monitoring: Monitor system logs for unusual driver crashes or kernel-level errors that may indicate an attempt to trigger the stack overflow.

Compensating Controls: Restrict local system access to authorized personnel only to minimize the risk of an attacker reaching the required privilege level to exploit this vulnerability.

Public Exploit Available: Unknown

MediaTek WLAN AP drivers are critical components for network connectivity and management. Administrators should prioritize the deployment of the provided patch to all affected hardware, including those running openWRT, to prevent potential escalation of privilege attacks. Ensure that all firmware lifecycle management processes are followed to verify the integrity of the updated driver packages.