A heap overflow vulnerability in MediaTek WLAN AP drivers could allow a local attacker with user-level privileges to escalate their access to the system.

This vulnerability is a heap overflow (CWE-122) caused by an incorrect bounds check within the WLAN access point driver. An attacker who has already obtained local user execution privileges can leverage this flaw to execute code with elevated permissions without requiring user interaction.

Successful exploitation of this vulnerability results in a local escalation of privilege, granting an attacker control over the affected system. Given the CVSS score of 7.8, this represents a high-severity risk to system integrity and confidentiality, potentially allowing attackers to bypass security boundaries, access sensitive data, or install persistent malware on the underlying hardware.

Immediate Action: Update the affected MediaTek SDK to a version later than 7.6.7.2 or apply the vendor-provided patch WCNCR00441509.

Proactive Monitoring: Monitor system logs for unauthorized attempts to access kernel-level functions or unexpected driver crashes that may indicate exploitation attempts.

Compensating Controls: Restrict local access to the affected devices to only authorized and trusted personnel to prevent the initial user-level execution required for this exploit.

Public Exploit Available: No (exploit_available: false)

This vulnerability presents a clear path for local privilege escalation on MediaTek-powered networking hardware. Organizations should prioritize updating their firmware to the latest vendor-released versions as specified in the November 2025 product security bulletin. Applying these patches is essential to prevent attackers from gaining full control over affected access points and routers.