During a presentation at Black Hat Asia in Singapore yesterday, two security researchers from Positive Technologies revealed how an undocumented technology inside Intel microchips might be activated by attackers. The Visualization of Internal Signals Architecture (VISA) enables data from memory to be read, and signals from peripherals to be interrupted.

https://www.forbes.com/sites/daveywinder/2019/03/29/visa-the-undocumented-security-problem-inside-intel-what-you-need-to-know/#66a626944fbc