If you have a Samsung TV, there are several ways to turn off voice recording. On newer TVs, go to Home > Settings > System > Expert Settings > Voice Interactionand turn to off. On older TVs, it may be in Settings > select Smart Features > Voice Recognition > switch to off.
You can also go to Settings > Support > Terms & Policies and opt to "Disagree" with the policies for Viewing Information Services, Voice Recognition Services, and Nuance Voice Recognition and Privacy Notices.
If your TV offers gesture control or facial recognition to authenticate your Samsung account, you can turn this off in the Samsung Account settings menu or cover your camera with a piece of tape.
The alleged "Weeping Angel" attack revealed today, which was designed by the CIA to put Samsung TVs into a fake "off" mode, affects Samsung TVs with firmware versions 1111, 1112, and 1116, sold between 2012 and 2013 with "UNF" in the model name. While the attack suppresses most indicator lights on the TV, the blue LED on the back of the TV remains on.
The only way to defend yourself from this particular attack would be to either update the firmware or disconnect the smart TV from the internet entirely, which would essentially make it a dumb TV.
Samsung can also track your viewing habits and send that data to advertisers for targeted marketing purposes. To prevent this tracking, go to Menu > Smart Hub > Terms and Policy > SyncPlus and Marketing > disable SyncPlus.