Kernel 4.13-rc2-x86_64-exton is my newest Slackware kernel. Kernel 4.13-rc2 was released by Kernel.org on July 23, 2017.
I have compiled a very useful (as I think) 64 bit kernel for Slackware Current (14.2) and/or all Slackware derivatives. For example Slax, Zenwalk and SlackEX. The kernel is compiled exactly in the same way as Slackware’s latest kernel huge. “My” kernel 4.13-rc2-x86_64-exton has even more support for new hardware, etc. Kernel 4.13-rc2 is the latest kernel available from Kernel.org. Released 20170723.