Complex sentence: Linux kernel developers have a set of patches named kernel page-table isolation (KPTI aka KAISER) to be released in kernel 4.15 in early 2018, which has been released as a backport in kernel 4.14.11.
Split into simpler sentences: Linux kernel developers have referred to this measure as kernel page-table isolation (KPTI). KPTI patches have been developed for Linux kernel 4.15, and have been released as a backport in kernel 4.14.11.