Apple has posted a support page on the security content of the just-released iOS 8.1.1, reaffirming previous reports that the firmware breaks the Pangu jailbreak tool. In the page, the company credits the Pangu team for discovering three vulnerabilities patched in 8.1.1.
Among those vulnerabilities was a state management issue in the dyld directory, which has to do with app launches. There was also a validation issue in the handling of metadata fields with the kernel, and a sandbox profile bug that allowed apps to launch arbitrary binaries.