A new CPU vulnerability dubbed “SQUIP”, which is the short for Scheduler Queue Usage via Interference Probing, has been discovered by security researches. Apple M1 processors and AMD Zen-based Ryzen chips, among others, have been found vulnerable to this new security flaw.
The vulnerability is related to the multi-scheduler queues in CPUs. Intel, unlike Apple and AMD, uses a single scheduler in its architecture, which means it is not affected by SQUIP. The latter however use multiple schedulers.
On the AMD side, SKUs with simultaneous multi-threading (SMT) technology are affected, which is nearly every AMD processor SKU out there except for a few models (We have listed them towards the end). The issue is tracked under the ID “CVE-2021-46778”.
Here is a summary and mitigation measures provided by AMD:
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