Elan I2C Driver Firmware Size Validation Flaw

Executive Summary

This vulnerability in the Linux kernel involves a flaw in the elan_i2c driver where firmware files are not properly validated before use. Specifically, the driver fails to check if the firmware size is sufficient to contain the expected number of pages and the signature located at the end of the firmware blob. This oversight can lead to out-of-bounds reads when accessing these elements.

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Detection Guidance

This vulnerability affects the Linux kernel's elan_i2c driver. Detection involves checking if your system uses a vulnerable kernel version and if the elan_i2c module is loaded. Run: uname -a to check kernel version and lsmod | grep elan_i2c to verify if the module is loaded.

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Impact Analysis

This vulnerability could allow an attacker to read sensitive memory contents or cause system instability by triggering out-of-bounds memory access. If exploited, it may lead to unauthorized data exposure, crashes, or potential privilege escalation on affected systems.

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Mitigation Strategies

Update your Linux kernel to the latest patched version. If your distribution provides a kernel update, apply it immediately. Disable the elan_i2c module if not needed using modprobe -r elan_i2c.

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