CVE-2026-80754
Received Received - Intake

Synaptics RMI4 F55 TX Electrode Count Typo Fix

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: Input: synaptics-rmi4 - fix F55 transmitter electrode count typo During F55 sensor detection, the transmitter (TX) electrode count was incorrectly assigned the value of the receiver (RX) electrode count due to copy-paste typos. This incorrect value was then propagated to the driver data and used by F54 to determine the diagnostics report size. On devices with more RX than TX electrodes, this inflated the perceived TX count, leading to incorrect report size calculations and potential out-of-bounds buffer accesses. Fix the typos by correctly assigning the TX electrode counts.

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Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-03
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
CVE-2026-80754
EUVD
EUVD-2026-70358

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
synaptics synaptics-rmi4 *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel involves a typo in the synaptics-rmi4 driver where the transmitter electrode count was incorrectly set to the receiver electrode count during F55 sensor detection. This caused incorrect report size calculations and potential buffer overflows.

Detection Guidance

This vulnerability is specific to the Linux kernel's synaptics-rmi4 driver and relates to incorrect electrode count handling in F55 sensor detection. Detection requires checking kernel logs for F55 sensor initialization errors or buffer overflow warnings during driver loading. Use commands like dmesg | grep -i rmi or journalctl -k | grep -i rmi to inspect kernel logs for errors.

Impact Analysis

The vulnerability could lead to system instability or crashes due to out-of-bounds memory access. It may also cause incorrect touchpad behavior or diagnostics failures on affected devices.

Mitigation Strategies

Apply the kernel patch that fixes the F55 transmitter electrode count typo. Update your Linux kernel to a version containing the fix. If a patch is unavailable, disable the synaptics-rmi4 driver by blacklisting it in your system's module configuration.

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