See if it’s the swap, disable zram and/or add a swap file.
Doesn’t have to be a swap partition, you can create a file, format it as swap and assign it in /etc/fstab.
Btw when you say you don’t have swap do you mean you don’t have regular swap file/partition (because you have zram swap) or you don’t have swap at all?
They patch stuff like this fast because it’s a remote exploit. Local privilege escalation exploits are fixed much slower.