Intel gave it to MSI, but I may have been incorrect before. Apparently the keys was shared across multiple OEMs (at least that is how I read this below)
>The leaked private keys affect Intel’s 11th, 12th, and 13th generation processors and were distributed to various OEMs, including Intel itself, Lenovo, and Supermicro.
>The leaked private keys affect Intel’s 11th, 12th, and 13th generation processors and were distributed to various OEMs, including Intel itself, Lenovo, and Supermicro.