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Google research improves Retbleed exploit on Zen 2

🔬 Google researchers demonstrated practical improvements to the Retbleed speculative-execution attack, showing that on AMD Zen 2 CPUs attackers can read arbitrary RAM at roughly 13 KB/s with perfect cache-extraction accuracy. They adapted a modified Speculative ROP technique to evade Spectre v2 mitigations and showed ways to bypass Linux kernel defenses. The exploit still requires prior knowledge of kernel configuration, but common default builds and probing reduce that hurdle, and Google has already restricted Zen 2 in certain cloud workloads.