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).
Spectre-BHB: Speculative Target Reuse Attacks version 1.8-r0p2
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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).