Ahead of the Linux 6.5-rc2 release tomorrow there was a set of x86/x86 64 kernel changes merged overnight to deal with some weaknesses in the kernel's Control Flow Integrity (kCFI) / FineIBT (Indirect Branch Tracking) code.
Control-flow integrity (CFI) refers to techniques which prevent control-flow hijacking attacks. This article describes some compiler/hardware features with a focus on llvm-project implementations. CFI