CVE-2026-4179 Zephyr STM32 USB设备驱动无限循环拒绝服务漏洞

// 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 } } // ... } */