CVE-2023-44431

What it actually does

Stack-based buffer overflow in BlueZ AVRCP protocol handling caused by missing validation of user-supplied data length before copying into a fixed-size stack buffer, enabling remote code execution as root.

Why it matters to the business

Compromise of Bluetooth-enabled Linux systems could result in full device takeover, data exposure, or unauthorized access when users connect to attacker-controlled devices, increasing risk for organizations relying on wireless peripherals.

How an attack unfolds

An attacker configures a malicious Bluetooth device that advertises an AVRCP profile; when a victim connects, the attacker transmits oversized AVRCP data that overflows the stack buffer and executes arbitrary code with root privileges.

How to fix it

Update BlueZ to a patched release that enforces proper AVRCP length validation; apply vendor-supplied fixes for affected distributions as they become available.

How to confirm the fix worked

Verify installed BlueZ version against advisory patches, review Bluetooth stack source for AVRCP length checks, and test connectivity with malformed AVRCP traffic in a lab environment.

Typical attack path

1. Deploy a malicious Bluetooth device advertising AVRCP
2. Wait for or lure target device to connect
3. Send crafted AVRCP packets containing excessive data
4. Trigger stack overflow to execute code as root

How to detect it

Review system and Bluetooth daemon logs for unexpected AVRCP connections or crashes; inspect for root-owned processes spawned shortly after Bluetooth pairing events.

What your security team should do

• Prioritize BlueZ updates across all Linux endpoints with Bluetooth
• Disable Bluetooth services where not required
• Implement user training to avoid pairing with unknown devices
• Monitor EPSS and vendor advisories for exploit maturity changes