Underflow Fix in Linux Kernel's hwmon Module

CVE-2024-46758

What is CVE-2024-46758?

The vulnerability in the Linux kernel's hwmon module for the lm95234 component arises when writing limit attributes, triggered by user-provided input. Specifically, it can lead to an underflow when a large negative number, such as -9223372036854775808, is processed. The issue is addressed by adjusting the order of operations in the clamp_val() and DIV_ROUND_CLOSEST() functions, ensuring the kernel can handle extreme values more securely. The resolution emphasizes the need for developers to validate user inputs rigorously, mitigating potential exploits that target flaws in the handling of numeric limits.

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References