I always believe allowing any forms of JIT (in userspace programs) by default creates unnecessary security risks - only a handful of programs use it. The sysadm

I always believe allowing any forms of JIT (in userspace programs) by default creates unnecessary security risks - only a handful of programs use it. The sysadmin should have a choice to enforce strict W^X on all programs and to whitelist JIT-enabled applications only when needed. The kernel space BPF JIT in particular, is an huge attack vector and has been repeatably exploited (or facilitated other exploits) in the past. If you don't need BPF JIT, I recommend disabling it. Sure, tcpdump or nftable may be slower, but often it doesn't matter, unless it's a cutting edge production system which actually relies on BPF JIT. It can either be removed completely when building the kernel, setting "net.core.bpf_jit_enable" in sysctl to disable it globally, or setting "kernel.unprivileged_bpf_disabled" to disable it for unprivileged programs.