Android 16 has a clever way to defeat USB-based hacking

April 28, 2025 April 28, 2025

Android 16 Boosts Security with USB Blocking Feature

Google has always prioritized user security on Android. While they've implemented numerous security measures, protection against USB-based attacks has been a relatively unexplored area. This is changing with the arrival of Android 16.

Based on a report from Mishaal Rahman (via Android Authority), Android 16 Beta 4 includes a feature that blocks USB devices when the phone is locked. This new Security Mode leverages Android's Advanced Protection Mode (APM) to effectively disable USB devices, preventing unauthorized access.

How Android 16 Enhances Security by Blocking USB Devices

Android allows the use of USB devices, such as storage drives and keyboards, while your phone is unlocked. This functionality is useful for transferring files or using peripherals. While convenient, these devices can present a security risk if a phone falls into the wrong hands.

Google's new security measures aim to prevent unauthorized access to your data through USB devices if your phone is locked, for example, if it's stolen. This added layer of protection helps safeguard sensitive information from potential hackers.

This feature works through Advanced Protection Mode (APM). While APM doesn't currently have a user-accessible activation process, it was reportedly possible to activate it manually to test the USB blocking capabilities. With APM active and USB data signal blocking enabled, connecting a USB device, like a storage drive, will be blocked. Android will notify you that the device needs to be unlocked for the USB device to function.

Locking Your Phone Won't Disconnect an Already-Connected Device

It's important to understand that this new security feature is designed to prevent unauthorized access from newly connected USB devices when the phone is locked. If a USB device is already connected and the phone is subsequently locked, Android won't disconnect the device.

This approach is based on the assumption that if your device is unlocked and a USB device is connected, it's likely you are the one using it. If a thief bypasses your lock screen security, they could plug in any USB device, and locking the phone again would only hinder their progress. While it might seem unnecessary to disconnect already-connected devices upon locking, it could be a beneficial addition to further enhance security, as a device could be re-locked even during an attempted breach.

It's currently unclear if Google will make this feature readily accessible to users in the final release of Android 16.