Various open-source patches have gone back to at least 2017 for enabling Intel’s Control-Flow Enforcement Technology (CET) for the Linux kernel and related components. This is the Intel feature for helping prevent ROP and COP/JOP style attacks via indirect branch tracking and a shadow stack. Recently there has been a fair amount of CET improvements to the various open-source components…

Source: Phoronix – Intel CET Support Still Getting Squared Away For Linux In 2020