Members of both iPhone Dev Team and Chronic Dev Team confirmed this on Twitter:
cpich3g: congrats to @pod2g for the latest exploit and also @p0sixninja who have been trying for months.
pod2g: iPhone 4G iBSS 4.0.1: iv=91f94e5d726a2d2f2c7ffad58d4f3b77 key=d05c3c40db40e738926f811b8b1314038d26096c4102461698a49098c47a3fe6
MuscleNerd: Crazy timing that @pod2g got latest exploit just as 4.1 went public (lots of work left…keep away from 4.1 for now!)
Also, the best thing about a low-level bootrom exploit is that Apple wont be able to patch it simply by releasing a new firmware update. Instead, it will require Apple to release a revised hardware version of iPhone 4, iPhone 3GS, iPad and the iPod touches with new bootroms in order to patch the bootrom exploit. This is the reason why iOS devices (like iPhone 3GS (new bootrom), iPhone 4, iPad, iPod touch 3G / 4G) which shipped after November 2009 are currently not jailbreakable via PwnageTool because it uses the 24kpwn bootrom exploit, already patched by Apple.
Stay tuned as we will keep you updated as soon as we get more info about this!
UPDATE 1: pod2g has just tested the exploit on iOS 4.1 (final version) and confirmed that it is working!
Works on 4.1 (!) iBSS iv=c2c5416472e5a0d6f0a25a123d5a2b1c key=1fbc7dcafaec21a150a51eb0eb99367550e24a077b128831b28c065e61f894a0
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