CVE-2026-63908

Summary

In the Linux kernel, the following vulnerability has been resolved:

Input: atmel_mxt_ts - fix boundary check in mxt_prepare_cfg_mem

When a configuration file provides an object size that is larger than the driver's known mxt_obj_size(object), the driver intends to discard the extra bytes.

The loop iterates using for (i = 0; i < size; i++). Inside the loop, the condition to skip processing extra bytes is:

if (i > mxt_obj_size(object))
    continue;

Since i is a 0-based index, the valid indices for the object are 0 through mxt_obj_size(object) - 1.

When i == mxt_obj_size(object), the condition evaluates to false, and the code processes the byte instead of discarding it.

This causes the code to calculate byte_offset = reg + i - cfg->start_ofs and writes the byte there, overwriting exactly one byte of the adjacent instance or object.

Update the boundary check to skip extra bytes correctly by using >=.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/862a1a32b5190241fce7a7d20229539a3926f31e
• https://git.kernel.org/stable/c/5c3681c3abc35cfac6b702251382312c60d96bc2
• https://git.kernel.org/stable/c/1017e1c6c6c49cccbcda9bbcfa49e50b0b6dad39
• https://git.kernel.org/stable/c/e9b62996ba537774f68fecfd7eecb5aec1713952
• https://git.kernel.org/stable/c/ae92e334544263a02d9f99e18385e718c44392c9
• https://git.kernel.org/stable/c/7f95f4792c0dc767fcb8e405391e779ab419d55a
• https://git.kernel.org/stable/c/6c6b989b4ebf22b086fdfcac2163b5cb55e34d8f
• https://git.kernel.org/stable/c/baa0210fb6a9dc3882509a9411b6d284d88fe30e

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