China’s cyberspace regulator has summoned Nvidia to explain whether its H20 chips have any “back-door safety” risks, casting a shadow over the US chip giant’s local operations. The Cyberspace Administration of China (CAC), the agency responsible for cybersecurity, said in a statement on Thursday that it had summoned and interviewed Nvidia regarding the risks associated with the potential tracking and remote control functions of its H20 chips. The regulator requested that the company provide...