It's FOSS - https://itsfoss.com/linux-kernel-4-14-released/
Linux Kernel 4.14 is here. It is a long-term support release and as stated earlier, it is the first Linux Kernel that will be supported for six years. Until now Linux Kernel LTS versions were supported for two years.
As usual, Linus Torvalds announced the release of Linux 4.14 in Linux Kernel mailing list. Introducing the release, Linus said, “No surprises this week, although it is probably worth pointing out how the 0day robot has been getting even better (it was very useful before, but Fengguang has been working on making it even better and reporting the problems it has found)”.