CVE-2026-80569

Technical Description

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

Input: synaptics-rmi4 - bound the F54 report size to the allocated buffer

rmi_f54_work() reads a diagnostics report from the device into

f54->report_data, sizing the transfer with rmi_f54_get_report_size():

report_size = rmi_f54_get_report_size(f54);

...

for (i = 0; i < report_size; i += F54_REPORT_DATA_SIZE) {

int size = min(F54_REPORT_DATA_SIZE, report_size - i);

...

rmi_read_block(.., f54->report_data + i, size);

}

report_data is allocated once at probe from F54's own electrode counts

(array3_size(f54->num_tx_electrodes, f54->num_rx_electrodes, sizeof(u16))),

but rmi_f54_get_report_size() computes the size from

drv_data->num_*_electrodes when those are set, i.e. from the F55

function's electrode counts. Both counts come straight from device

queries (F54 and F55 each report up to 255 electrodes) and nothing

constrains the F55 counts to the F54 ones.

A malicious or malfunctioning RMI4 device that report

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References