Linus Torvalds has released the latest stable kernel for 4.14, 4.12 and 4.15-rc7. Linuss tree contains all of the fixes we currently know about to handle the Meltdown vulnerability for the x86 architecture. But most people do not run a -rc kernel in a normal environment. If your distro does not have kernel updates, then I strongly suggest changing distros right now. Go enable the CONFIG_PAGE_TABLE_ISOLATION kernel build option, and rebuild and reboot.”]
Source: http://kroah.com/log/blog/2018/01/06/meltdown-status/