Explore the intricacies of Ghost DMA attacks and the SeDeFuS conundrum in this 42-minute conference talk from BSidesLV 2021. Delve into the world of Direct Memory Access (DMA) attacks, IOMU, and security subsystems as Dr. Raghudeep Kannavara and Alan Sheng break down complex concepts. Understand the threat model, ACPI DMAR, PCIe Address Translation Service, and their impact on user security. Learn about potential mitigations and key takeaways, and witness a live demonstration of the concepts discussed. This talk provides valuable insights into cutting-edge cybersecurity challenges and solutions, making it essential viewing for security professionals and enthusiasts alike.