Executive Summary

This vulnerability exists in the Linux kernel's Thunderbolt subsystem. Specifically, the function tb_xdp_properties_request() copies data based on a length value derived from a response header without verifying that this length fits within the allocated buffer size. A malicious peer can exploit this by setting the length field larger than the actual allocated data length, causing the memcpy operation to write beyond the allocated memory buffer.

The fix involves clamping the per-packet copy length so that the cumulative offset never exceeds the allocated data length, preventing out-of-bounds memory writes.

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Impact Analysis

This vulnerability can lead to out-of-bounds memory writes in the Linux kernel when handling Thunderbolt device communications. Such memory corruption can potentially cause system instability, crashes, or be leveraged by an attacker to execute arbitrary code with kernel privileges.

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