AMD Zen-based processors with Simultaneous Multi-threading (SMT) like Ryzen, Threadripper, EPYC, and Athlon CPUs have been found to be vulnerable to a new “SQUIP” side-channel attack.
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Veteran chip designer Jim Keller, who worked on AMD's Zen processor core micro-architecture, has called AMD stupid for cancelling the sister project K12, which was being developed using Arm.
One of the recent patents from Intel bears an uncanny resemblance to AMD's Zen microarchitecture. The patent is apparently that of Intel's next-gen Ocean Cove design and near perfectly matches Zen.