CVE-2026-63908: Input: atmel_mxt_ts - fix boundary check in mxt_prepare_cfg_mem
In the Linux kernel, the following vulnerability has been resolved:
Input: atmelmxtts - fix boundary check in mxtpreparecfgmem
When a configuration file provides an object size that is larger than the driver's known mxtobjsize(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 > mxtobjsize(object)) continue;
Since i is a 0-based index, the valid indices for the object are 0 through mxtobjsize(object) - 1.
When i == mxtobjsize(object), the condition evaluates to false, and the code processes the byte instead of discarding it.
This causes the code to calculate byteoffset = reg + i - cfg->startofs 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
Remediation
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Change the condition that skips extra configuration bytes from `i > mxt_obj_size(object)` to `i >= mxt_obj_size(object)` so bytes at the object-size boundary are discarded.
Linux kernel atmel_mxt_ts driver mxt_prepare_cfg_mem boundary check = i >= mxt_obj_size(object)
Event History
Frequently Asked Questions
What must an attacker or local user be able to do to trigger this issue?
They must be able to supply a configuration file containing an object whose declared size exceeds the size known to the atmel_mxt_ts driver. Processing that configuration causes one extra byte to be written into the adjacent instance or object.
What is the impact of a malformed oversized configuration object?
The driver fails to discard the byte at index equal to the known object size. It writes that byte at a calculated offset, overwriting exactly one byte of an adjacent instance or object.
Which systems are potentially exposed?
Systems running an affected Linux kernel with the atmel_mxt_ts input driver are potentially exposed when they process a configuration file with an oversized object. The listed software includes Linux kernel packages and Ubuntu kernel variants including linux-fips, linux-aws, linux-azure, linux-aws-fips, linux-azure-fips, and linux-gcp-fips.