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New TONTOU CPU attack bypasses Spectre v2 fixes, leaks Linux password hashes

BleepingComputer·August 6, 2026·1 min read
New TONTOU CPU attack bypasses Spectre v2 fixes, leaks Linux password hashes

Researchers have found a way to bypass recent mitigations for Spectre v2 speculative execution side-channel attacks and developed an exploit to leak secrets from Linux machines. The new attack, named TONTOU, targets CPU vulnerabilities that were previously thought to be patched, raising concerns about the effectiveness of current defenses.

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