Yet another Android security bug can render your phone silent.
“By either installing a malicious app on an Android device, or directing users to a nefarious website, hackers can cause an Android device to become ‘apparently dead — silent, unable to make calls, with a lifeless screen,’ Trend Micro explained. If the exploit is installed through an app, it can auto-start whenever the device boots, causing Android to crash every time the device is powered on.”
From what I’m reading on other sites, if the bug is activated by just visiting a malicious site, you can reboot the phone and you’ll be fine. I’m reading a lot of different takes, though – I think this is still developing.