https://motherboard.vice.com/en_us/article/nee8gz/hackers-could-silently-hack-your-cellphone-and-computers-over-bluetooth

For years, cybersecurity experts have told people to keep Bluetooth off as a precaution against hackers. Now, there's yet another reason to do so: a series of vulnerabilities in the way major operating systems implemented Bluetooth allowed hackers to take over your cellphone or computer whenever Bluetooth was on.

Researchers at security firm Armis disclosed on Tuesday eight "critical" Bluetooth vulnerabilities that allowed hackers to break into and take control of smartphones and computers with no user interaction, and no way for the user to know what was happening. According to the researchers, the the vulnerability affected virtually all Bluetooth devices, including Android phones, older iPhones, Windows computers some devices running Linux.