Vulnerability in Linux Kernel Affecting Zen1 Hardware Divider

CVE-2026-31628

What is CVE-2026-31628?

A vulnerability in the Linux kernel's Zen1 hardware divider allows for potential data leakage. Under certain conditions, leftover results from previous operations can be exposed to other threads. This issue, known as FPDSS, has been addressed by implementing a mitigation technique, referred to informally as a 'chicken bit'. This fix is critical to ensure that sensitive data remains secure and inaccessible to unauthorized processes.

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