A major smartphone bug has been discovered that could affect millions of users.

Cyber researchers identified the bug in the Android operating system's video playback engine called "Stagefright."

If a hacker sends a text message with an infected video message, personal information on the phone - even its camera - could be accessed remotely.

Researchers informed Google about the bug and a spokesperson told News 12 that "As soon as we were made aware of the vulnerability, we took immediate action and sent a fix to our partners to protect users."

Mashable.com's Lance Ulanoff says that there is no reason to panic, since there has been no evidence that hackers have taken advantage of the vulnerablity. However, he says that doesn't mean users shouldn't take precautions.

"If you receive a message and you don't know who it's from, don't open it. Delete it," Ulanoff says.

Google's Nexus-branded phones should already have security patches available for download to prohibit any possible hacks.

People who don't have a Nexus phone can protect themselves by blocking unknown senders in the Messenger app or turning off "Auto-Retrieve" for multimedia messages.