https://www.techradar.com/news/intel-releases-spectre-patches-for-not-just-skylake-but-kaby-lake-and-coffee-lake-processors

Intel has ironed out the bugs and released revamped Spectre fixes for all of its newest processors – those from Skylake (6th-generation) onwards.

That means working Spectre patches (which don’t cause the stability issues that previous fixes did) are available for Skylake (which was previously announced) as well as Skylake-X, Kaby Lake, and Coffee Lake CPUs.