According to another link on here, there are plans to patch all the way back to 45nm Core 2 Duo chips in the works: https://www.anandtech.com/show/12533/intel-

According to another link on here, there are plans to patch all the way back to 45nm Core 2 Duo chips in the works: https://www.anandtech.com/show/12533/intel-spectre-meltdown https://www.anandtech.com/show/12533/intel-spectre-meltdown