Chinese authorities summoned Nvidia Corp. to discuss alleged security risks related to its H20 chips, casting doubt over the domestic business of the world’s most valuable company.

China’s cyberspace regulator said Thursday that it had summoned representatives of U.S. tech giant Nvidia to explain alleged security vulnerability risks involving its highly sought-after H20 artificial intelligence chips.

China raised concerns over potential security risks in Nvidia's H20 artificial intelligence chip, casting uncertainty over the U.S. company's sales prospects in China weeks after a U.S. export ban was reversed.