The authors demonstrate that bias-free branch prediction and speculative branch history updates create exploitable cross-privilege primitives: BST eviction (Spectre-BSE, BiasScope) and branch history speculation (Spectre-BHS, Chimera).
https://docs.kernel.org/admin-guide/h w-vuln/spectre.html
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Exploiting Inaccurate Branch History in Side-Channel Attacks
The authors demonstrate that bias-free branch prediction and speculative branch history updates create exploitable cross-privilege primitives: BST eviction (Spectre-BSE, BiasScope) and branch history speculation (Spectre-BHS, Chimera).