Fresh from iClarified The team behind the Pangu untethered jailbreak of iOS 7.1-7.1.2 has released a Pangu8 untethered jailbreak for iOS 8 – 8.1.

Currently a jailbreak utility is only available for Windows and at this time Cydia and Mobile Substrate are not working.

Here’s the translated details via reddit user zsm1703.

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PanGu iOS 8 Jailbreak Tool(pangu.io)
1. Preparations for jailbreak.
Backup before using pangu jailbreak tool. Although this tool is tested successfully on most devices, we still hope you backup your data to avoid data loss. Please turn off the screen password lock and close the “find my iPhone” feature in the iCloud settings before jailbreak.

2. the firmware upgraded via OTA may cause failure.
The firmware upgraded via OTA will have a lot of influence factors. If you have several failed attempts, Please try to download the latest firmware and restore your iOS devices. In addition, Pangu (iOS 8) tool now add a function to restore iOS devices and execute automatic activation, you can try click the jailbreak button after restoring, and Pangu will automatically activate your device and do jailbreak. Source @iClairified