As of Jan 28, 2018 this is Asus's response, two patched X99 motherboards:
https://www.asus.com/News/V5urzYAT6myCC1o2
Whereas MSI has provided patches for 22 X99 motherboards:
https://www.msi.com/news/detail/7yJ7XCklfBXt8mFhG8nkfSurJUz3q1A6IXPT4QtmCFh1LubZaZoplvysc-5THpt0K3BM1MTYlMvOQ97-Snztbw~~