Buffer Overflow in Linux Kernel Greybus Subsystem

Executive Summary

This vulnerability exists in the Linux kernel component greybus, specifically in the gb-beagleplay bootloader receive buffering functionality. The function cc1352_bootloader_rx() appends incoming serial device chunks into a fixed receive buffer before parsing bootloader packets. Because the helper function can keep leftover bytes between callbacks and may receive multiple packets in one callback, a single count value is not limited to one packet length.

The vulnerability arises when the incoming chunk does not fit in the remaining space of the receive buffer. Without proper checks, this could lead to an overflow of the rx_buffer. The fix involves checking if the incoming chunk fits in the remaining buffer space before copying it with memcpy(). If it does not fit, the staged data is dropped and the bytes are consumed to prevent overflowing the buffer.

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Impact Analysis

If exploited, this vulnerability could lead to a buffer overflow in the receive buffer of the bootloader communication process. Buffer overflows can cause unexpected behavior such as crashes, data corruption, or potentially allow an attacker to execute arbitrary code or escalate privileges within the system.

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Mitigation Strategies

To mitigate this vulnerability, update the Linux kernel to a version where the greybus gb-beagleplay bound bootloader receive buffering issue has been resolved.

The fix involves ensuring that the incoming data chunk fits in the remaining receive buffer space before copying it, preventing buffer overflow.

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