Explore a comprehensive security analysis of TrustZone-assisted Trusted Execution Environment (TEE) systems in this IEEE conference talk. Delve into the prevailing security vulnerabilities affecting TEE systems developed by major companies like Qualcomm, Trustonic, Huawei, Nvidia, and Linaro. Examine the types of vulnerabilities, challenges in building secure TEE systems, and potential solutions from the research community. Gain insights into the architecture issues, implementation flaws, and hardware vulnerabilities that compromise TEE security. Learn about the severity of TEE vulnerabilities, their impact across software layers, and the various attack vectors used by malicious actors. Discover architectural, implementation, and hardware defenses proposed to enhance TEE security. Understand the implications of these vulnerabilities for the hundreds of millions of mobile devices relying on TrustZone for protecting security-critical applications and operating system components.