procps-ng, procps is vulnerable to a process hiding through race condition. Since the kernel"s proc_pid_readdir returns PID entries in ascending numeric order, a process occupying a high PID can use inotify events to determine when the process list is being scanned, and fork/exec to obtain a lower PID, thus avoiding enumeration. An unprivileged attacker can hide a process from procps-ng"s utilitie ...