Bro, for the kernel exploit, it's "up to 5.1.1"(confirmed), "5.1.2 to 5.3.0"(tentative), and "NO. Do not update past 5.3.0 if you can help it."
Read the sticky: https://gbatemp.net/threads/wii-u-homebrew-situation-and-faq.367627/
Or do you know something about 5.3.2 that the mods here don't...