  Artificial intelligence (AI) will play an increasing role in cellular network
deployment, configuration and management. This paper examines the security
implications of AI-driven 6G radio access networks (RANs). While the expected
timeline for 6G standardization is still several years out, pre-standardization
efforts related to 6G security are already ongoing and will benefit from
fundamental and experimental research. The Open RAN (O-RAN) describes an
industry-driven open architecture and interfaces for building next generation
RANs with AI control. Considering this architecture, we identify the critical
threats to data driven network and physical layer elements, the corresponding
countermeasures, and the research directions.
