Zephyr RTOS STM32 USB device driver (drivers/usb/device/usb_dc_stm32.c) - 受影响版本需参考Zephyr官方安全公告
PoC / Exploit Code
⚠ For Security Research Only
The following code is for security research and authorized testing only.
python
// PoC concept for CVE-2026-4179 - STM32 USB infinite loop trigger
// This is a conceptual PoC demonstrating the vulnerability trigger condition
// Note: Actual exploitation requires specific hardware and USB setup
#include <zephyr.h>
#include <usb/usb_device.h>
#include <drivers/usb/udc.h>
// Trigger condition: specific USB state transition sequence
void trigger_infinite_loop(void) {
// Step 1: Initialize USB device in STM32
if (usb_enable(NULL) != 0) {
return;
}
// Step 2: Trigger specific error condition in USB_dc_stm32
// The vulnerability exists in the state machine handling
// Specific USB control transfer sequences can cause:
// - SETUP transaction handling enters infinite loop
// - Endpoint state transitions fail to exit while loop
// - IRQ handler enters deadlock condition
// The PoC would involve:
// 1. Sending malformed USB SETUP packets
// 2. Forcing specific USB device state transitions
// 3. Triggering endpoint interrupt conditions that loop indefinitely
printk("Attempting to trigger CVE-2026-4179\n");
printk("Vulnerable code path: usb_dc_stm32.c\n");
printk("Target: infinite while loop in USB state machine\n");
}
// Attack scenario:
// 1. Attacker gains local access to device running Zephyr RTOS
// 2. Attacker triggers USB state that causes infinite loop
// 3. System becomes unresponsive - DoS achieved
/*
Vulnerable code pattern (conceptual):
void usb_dc_stm32_irq_handler(void) {
// ...
while (1) { // Infinite loop vulnerability
status = usb_dc_stm32_ep_read(...);
if (status != 0) {
// Should break but condition never met
// Loop continues indefinitely
}
}
// ...
}
*/