Security researchers from the Israeli firm Lava identified 32 Nvidia Blackwell Ultra B300 accelerators within the China Telecom network. The discovery was made via the Nvidia Data Center GPU Manager Exporter tool, which was exposed to the public internet without security protections.
The B300 hardware features 288 GB of HBM3E memory across eight 12-layer stacks, delivering a memory bandwidth of 8 TB/s. These chips are subject to strict US export controls, which prohibit their sale to unauthorized entities to prevent the development of advanced artificial intelligence models.
Nvidia addressed the incident by stating that such illicit shipments represent a minor fraction of the total hardware currently in China. According to the company, unauthorized products account for less than 0.5% of the total installed base of their equipment in the region.
