CVE-2026-80569

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 reports larger F55

electrode counts than its F54 counts makes report_size exceed the

allocation, so the read loop writes past report_data (and the V4L2

dequeue memcpy() then reads past it). On conforming hardware the F55

configured electrodes are a subset of the F54 physical electrodes, so

report_size never exceeds the buffer and well-behaved devices are

unaffected.

Record the allocation size and reject a report that does not fit,

mirroring the existing zero-size check.