No need to panic, but... sheesh.
The flaw relates to the memory optimization features in Intel processors. It can allow certain protected hardware registers to be accessed via software, which is not supposed to be accessible. It does this by taking advantage of the Gather Instructions found in the aforementioned CPUs, which feature AVX2 and AVX-512 support. This means malware can potentially allow access to your applications and software, and possibly steal data including passwords and encryption keys.
Worryingly, the vulnerability extends to cloud computing operators. Moghimi says:"Similarly, in cloud computing environments, a malicious customer could exploit the Downfall vulnerability to steal data and credentials from other customers who share the same cloud computer." AVX instructions are important in many intensive workloads. Various rendering or encoding apps use it, but many sub processes and libraries do too. So while you shouldn't panic, it'll be well worth keeping an eye on your motherboard's product page, and updating the BIOS when it recommends you do so.
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