Linux 4.14 & 4.15 Get KPTI Protection For 64-bit ARM
Today's Linux 4.14.20 and 4.15.4 kernels include the back-ported KPTI support after the work originally landed upstream in Linux 4.16. KPTI is for addressing the Meltdown CPU vulnerability on the ARM processors affected. KPTI is needed by 64-bit ARM SoCs except for the Broadcom Vulcan / Cavium Thunder X2 processors are white-listed. With Linux 4.16 there is also Spectre mitigation too, but that work doesn't seem to be back-ported to these current releases.
Those interested in all of the changes for these newest point releases can check out Linux 4.14.20 and Linux 4.15.4.