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Tom’s Hardware
Tom’s Hardware
Technology
Aaron Klotz

BIZARRE: Amd zen 1 vulnerability emerges dividing by 0 can leak sensitive data - What They Never Told You

AMD Linux Intel Corporation
A Ryzen processor sitting in a motherboard socket.

Despite the fact that AMD's Zen 1 architecture is immune to the recent 'Inception' vulnerability affecting modern Zen 3 and Zen 4 CPUs, another vulnerability has been found that affects Zen 1 CPUs specifically. According to a report by Phoronix, a new Zen 1 vulnerability was found that can release potentially sensitive data if the CPU divides an integer calculation by the number 0 in Linux operating systems.

According to commentary made by AMD Linux developer Borislav Petkov, the bug specifically leaves "stale quotient data" after a Zen 1 CPU divides an integer calculation by 0 in certain circumstances. The fix involves doing a "dummy division 0/1 before returning from the #DE exception handler in order to avoid any leaks of potentially sensitive data."

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