Architectural Breach: AMD Zen 2 Flaw Allows Higher-Privilege Instruction Corruption

AMD disclosed CVE-2025-54518, a hardware-level isolation flaw in Zen 2 processors' op/µop cache that can allow incorrect instructions to execute at higher privilege levels, potentially enabling privilege escalation; the advisory lists affected EPYC, Ryzen, Threadripper, and Embedded V2000 products, assigns a CVSS score of 7.3, and directs customers to OS-level mitigations for EPYC and PI/BIOS updates (with example PI versions and planned release dates) for Ryzen platforms.