- The AMD SinkClose flaw allows malware installation with nearly undetectable capabilities by enabling attackers to escalate privileges from Kernel-level (Ring 0) to Ring -2.
- This high-severity vulnerability, tracked as CVE-2023-31315, affects multiple generations of AMD processors, including EPYC, Ryzen, and Threadripper.
- Discovered by IOActive researchers, the flaw has remained undetected for nearly 20 years and can disable security features to facilitate persistent malware.
- Detection of malware installed via SinkClose requires physical access to the CPU and specialized tools, as it operates outside the visibility of the operating system.
- Although AMD has released mitigations for affected CPUs, the potential for exploitation remains a significant concern, especially from sophisticated threat actors and ransomware gangs.
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