Buffer Overflow in Dell WMI System Management Driver

Executive Summary

This vulnerability exists in the Linux kernel's platform/x86 dell-wmi-sysman component, specifically in the function populate_enum_data(). This function aggregates firmware-provided strings into fixed-size 512-byte structure members. Although each individual string is bounded, the code appends all strings and separators using raw strcat() calls without checking if there is enough remaining space in the buffer. This can lead to buffer overflow issues because the combined strings may exceed the buffer size.

The fix involved switching to a bounded append helper function that ensures the combined strings fit within the destination buffers, rejecting enumeration packages that do not fit.

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Impact Analysis

This vulnerability can lead to buffer overflow in the Linux kernel component handling firmware enumeration strings. Buffer overflows can cause system instability, crashes, or potentially allow an attacker to execute arbitrary code with kernel privileges, leading to a compromise of the system's security.

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Mitigation Strategies

The vulnerability has been resolved in the Linux kernel by switching the aggregation loops to a bounded append helper and rejecting enumeration packages whose combined strings do not fit in the destination buffers.

To mitigate this vulnerability, you should update your Linux kernel to the fixed version that includes this patch.

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