Explore the intricacies of exploiting a Use-After-Free vulnerability in the Android kernel's xt_qtaguid module in this 32-minute Black Hat conference talk. Delve into the history of vulnerabilities in the module, including the recently discovered CVE-2021-0399. Follow the Google Android Security team's investigation into the exploit potential, examining techniques like double free on kmalloc-128, KASLR leak, and various rooting methods. Learn about kernel protection mechanisms such as CONFIG_SLAB_FREELIST_HARDENED, KFENCE, and Kernel Control Flow Integrity. Gain insights into on-device protection, backend infrastructure, and behavioral detection methods used to mitigate such vulnerabilities in Android systems.