CVE-2026-23466: Linux内核drm/xe驱动内存破坏漏洞

/* * PoC Concept for CVE-2026-23466 * This demonstrates the race condition logic described in the vulnerability. * Triggering the actual crash requires a specific environment with drm/xe driver. */ #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <unistd.h> #include <sys/ioctl.h> // Simulating the condition where driver load fails or is unplugged // and async access occurs. void trigger_race_condition() { int fd; // Open the device (hypothetical path for drm/xe) fd = open("/dev/dri/card0", O_RDWR); if (fd < 0) { perror("Failed to open device"); return; } // In a real exploit, one would manipulate buffer objects (BOs) // to ensure they are freed asynchronously while the device is torn down. // This involves triggering a driver unload or load failure state. printf("Attempting to trigger MMIO access race condition...\n"); // The vulnerability allows MMIO access even after drm_dev_unplug protection // fails, specifically during the devm release phase. close(fd); } int main() { trigger_race_condition(); return 0; }