PMBus Core Phase Handling Buffer Overflow

Executive Summary

This vulnerability involves a flaw in the Linux kernel's hwmon subsystem, specifically in the pmbus/core component. The issue arises from insufficient phase limits in the code, which can lead to out-of-bounds writes when probing certain hardware devices like MAX20826, mp2975, and mp2856. These devices support more phases than the current code accounts for, creating a potential security risk.

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Detection Guidance

This vulnerability is specific to the Linux kernel's hwmon subsystem and pmbus/core driver. Detection requires checking the kernel version and installed drivers for affected components like the mp2975 or mp2856 chips. Use commands like 'uname -a' to check kernel version and 'lsmod | grep pmbus' to verify if the pmbus module is loaded.

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Impact Analysis

This vulnerability could allow an attacker to execute arbitrary code or cause a denial of service by triggering out-of-bounds memory writes. It primarily affects systems using the affected Linux kernel versions with compatible hardware devices, potentially leading to system instability or unauthorized access.

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Mitigation Strategies

Update the Linux kernel to the latest stable version that includes the fix for this vulnerability. If using affected drivers like mp2975 or mp2856, ensure they are updated or patched. Monitor vendor advisories for kernel updates and apply them promptly.

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