CVE-2026-31628
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, a vulnerability was found in AMD Zen1 processors where the hardware divider can leave partial results from previous operations, which can be leaked by an attacker thread. The fix applies a chicken bit to mitigate the issue.
Risk Assessment
The risk involves potential leakage of sensitive data between threads on the same CPU core, allowing an attacker to read information processed by other processes.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit with chicken bit) and apply AMD microcode if available.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: x86/CPU: Fix FPDSS on Zen1 Zen1's hardware divider can leave, under certain circumstances, partial results from previous operations. Those results can be leaked by another, attacker thread. Fix that with a chicken bit.