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microcode

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TONTOU sidesteps Spectre v2 fixes: patch your Linux kernels

August 8, 2026 · 11 min read

TONTOU sidesteps Spectre v2 fixes: patch your Linux kernels

A new CPU side-channel called TONTOU bypasses the Spectre v2 mitigations we have been running since 2018, enough to leak Linux password hashes.

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