I found this: https://siguza.github.io/IOHIDeous/ that was published Dec 31.
It took Apple 23 days since it was public before they released a fix.
> The exploit accompanying this write-up consists of three parts:
> poc (make poc) Targets all macOS versions, crashes the kernel to prove the existence of a memory corruption.
> leak (make leak) Targets High Sierra, just to prove that no separate KASLR leak is needed.
> hid (make hid) Targets Sierra and High Sierra (up to 10.13.1, see README), achieves full kernel r/w and disables SIP to prove that the vulnerability can be exploited by any unprivileged user on all recent versions of macOS [!!!!!!!!!]