CVE-2026-31625: Linux内核HID alps驱动空指针解引用漏洞

/* * Conceptual PoC for CVE-2026-31625 * This code demonstrates the vulnerable logic in the alps driver. * Triggering this requires a local environment and specific HID hardware interaction. */ #include <linux/hid.h> // Simulated vulnerable function structure static int alps_raw_event_vulnerable(struct hid_device *hdev, struct hid_report *report, u8 *data, int size) { // VULNERABILITY: Missing check for HID_CLAIMED_INPUT // if (!(hdev->claimed & HID_CLAIMED_INPUT)) // return 0; // If the input device is not claimed, the following access might lead to NULL pointer dereference // depending on the internal state of hdev->driver_data or input_dev struct input_dev *input = hdev->driver_data; // Hypothetical access // Processing raw event without checking if input is valid // ... return 0; } /* * Fix: The patch adds the following guard at the beginning of the function: * if (!(hdev->claimed & HID_CLAIMED_INPUT)) * return 0; */