CVE-2025-39824

Technical Description

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

HID: asus: fix UAF via HID_CLAIMED_INPUT validation

After hid_hw_start() is called hidinput_connect() will eventually be

called to set up the device with the input layer since the

HID_CONNECT_DEFAULT connect mask is used. During hidinput_connect()

all input and output reports are processed and corresponding hid_inputs

are allocated and configured via hidinput_configure_usages(). This

process involves slot tagging report fields and configuring usages

by setting relevant bits in the capability bitmaps. However it is possible

that the capability bitmaps are not set at all leading to the subsequent

hidinput_has_been_populated() check to fail leading to the freeing of the

hid_input and the underlying input device.

This becomes problematic because a malicious HID device like a

ASUS ROG N-Key keyboard can trigger the above scenario via a

specially crafted descriptor which then leads to a user-after-free

when the name of th

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