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Hackers Can Seize Control of Car Dashboards Through Modem Vulnerabilities

Security researchers have identified a critical vulnerability in automotive head units powered by integrated cellular modems. This vulnerability, found in modern connected vehicles, poses significant risks to system integrity and user safety.

NBy Noah KensingtonDec 18, 20251 min read

Security researchers have identified a critical vulnerability in automotive head units powered by integrated cellular modems. This vulnerability, found in modern connected vehicles, poses significant risks to system integrity and user safety.

Modern vehicles utilize 3G/4G/5G connectivity through embedded modems integrated into a System-on-Chip (SoC) architecture. This setup includes a Communication Processor (CP) responsible for network connectivity and an Application Processor (AP) running the vehicle’s operating system.

Researchers have discovered multiple vulnerabilities in the Unisoc UIS7862A SoC, widely used in Chinese vehicle head units. Notably, a stack-based buffer overflow in the 3G RLC (Radio Link Control) protocol implementation, identified as CVE-2024-39432, allows for remote code execution during the initial cellular connection phase.

The RLC protocol processes Service Data Units (SDU) packets using a 0xB4-byte stack buffer. An attacker can trigger a stack overflow by crafting a packet with over 90 headers. The absence of stack canary protection facilitates arbitrary code execution by overwriting return addresses.

Security researchers have identified a critical vulnerability in automotive head units powered by integrated cellular modems.
Noah Kensington · Thehackingpost

This vulnerability enables complete system compromise. Researchers achieved lateral movement to the Application Processor via a hidden Direct Memory Access (DMA) device vulnerability. This access allowed them to modify the running Android kernel and gain control over the vehicle's infotainment system.

Using Return Oriented Programming (ROP) techniques, researchers altered Memory Protection Unit (MPU) settings to write to protected code sections. They established persistent communication with the vehicle's system by patching the NAS (Non-Access Stratum) protocol handler.

The vulnerability poses serious threats to road safety and driver privacy. Attackers could potentially manipulate vehicle controls, alter navigation data, intercept communications, and access sensitive user information. The issue affects numerous vehicles, especially in regions where Chinese head units are prevalent.

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Manufacturers must urgently patch firmware across millions of vehicles to prevent potential real-world attacks. Until comprehensive updates are implemented, connected vehicle owners remain at risk of remote hijacking through malicious cellular signals.

Based on reporting by GBHackers.

AI transparency. This article was produced with the assistance of artificial intelligence and published under human editorial oversight. AI systems can make mistakes. Read how we use AI (EU AI Act, Art. 50).
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