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I think I read on the bug's website that "No fix has been released". I understood that as there is no public fix, but maybe it only means it's not in a tagged version of the kernel and no hotfixed distro kernels have been released?

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The patch was posted to the kernel mailing list; someone saw the e-mail, read the patch, figured it out, and published an exploit very soon after.

The fix has been commited to the git tree for the `netdev` linux subsystem fork. That's how it was noticed by the grsecurity guy who published an exploit. Then, it will be merged by linus either into a RC/master for the next linux minor version release, or into the patch releases branch by GregKH/Sasha for already-released versions. Or in this case, both, because it's a security fix.

Spender didn't publish any exploit afaik

Oh you're right, it was this guy (_SiCk / @encrypted_past) who replied to his post

https://xcancel.com/encrypted_past/status/205240982299839296... https://xcancel.com/encrypted_past https://github.com/0xdeadbeefnetwork https://github.com/0xdeadbeefnetwork/Copy_Fail2-Electric_Boo...

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