Explore the hidden world of x86 processors in this Black Hat conference talk. Delve into the secrets and vulnerabilities of modern chipsets through innovative techniques like page fault analysis and processor fuzzing. Learn how to exhaustively search the x86 instruction set, uncovering hidden instructions and hardware bugs. Discover the process of auditing processors, overcoming challenges, and utilizing tools like The Injector and The Sifter. Examine findings on hidden instructions in Intel and AMD processors, software bugs in development tools, hypervisor issues, and hardware bugs across various chip manufacturers. Gain insights into the complexities and potential security implications of x86 architecture in this comprehensive exploration of processor vulnerabilities.