Almost unfixable "Sinkclose" bug affects hundreds of millions of AMD chips
Briefly

Security researchers have discovered a vulnerability in AMD processors named Sinkclose, allowing hackers to run malicious code in System Management Mode since 2006, potentially leading to deep memory infection.
The Sinkclose flaw in AMD chips could enable malware like bootkits, evading antivirus detection, granting hackers full control over affected systems, exploiting a flaw in Platform Secure Boot configuration.
Read at Ars Technica
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