I am not an expert on RCEs whatsoever but my limited knowledge / gut feeling tells me that one works by after a buffer overflow flipping some bits and * invoki

I am not an expert on RCEs whatsoever but my limited knowledge / gut feeling tells me that one works by after a buffer overflow flipping some bits and * invoking syscalls * using (known) kernel vulnerabilities * libc bugs * exploiting buggy posix abstraction, etc. However, here all platforms seem to be exploited, regardless kernels (darwin/linux/windows), process models, libc implementations etc. I cannot unthink that this was simply doable because WhatsApp had already have code paths to place and run tasks/processes and this exploit works on this, higher level.