CVE-2026-64277

Technical Description

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

Input: synaptics-rmi4 - bound the F3A keymap to the GPIO count

rmi_f3a_initialize() takes the GPIO count from the device query register

(f3a->gpio_count = buf & RMI_F3A_GPIO_COUNT, range 0..127).

rmi_f3a_map_gpios() then allocates gpio_key_map with

min(gpio_count, TRACKSTICK_RANGE_END) == at most 6 entries, but

rmi_f3a_attention() iterates the full gpio_count and dereferences

gpio_key_map[i], and input->keycodemax is set to the full gpio_count

while input->keycode points at the 6-entry allocation.

A device that reports gpio_count > 6 therefore causes an out-of-bounds

read of gpio_key_map[] on every attention interrupt, and out-of-bounds

accesses through the input core's default keymap ioctls: EVIOCGKEYCODE

reads past the buffer (leaking adjacent slab memory to user space) and

EVIOCSKEYCODE writes a caller-controlled value past it, for any process

able to open the evdev node, since input_default_getkeycode() and

inpu

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. 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.

Affected Products

References