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Back to official kernel or check the kernel with the PoC exploit code yourself to confirm.

Samiux

The available PoC (Proof of Concept) exploit code is for Fedora and Ubuntu as well as Arch only. It is available for ethical and malicious hackers. Please read my blog at here for the details. If...

Where did you get this kernel?

As far as I know, the latest kernel for Ubuntu 12.04 LTS and 12.10 is 3.5.0-25 which is fixed the problem.

Samiux

I think 3.5.0-21 is not from PPA.

You can upgrade to the latest kernel in your distribution, you can :


sudo apt-get update
sudo apt-get dist-upgrade

Samiux

I don't think this statement is correct. Please refer to the "Reference" at my blog, it mentioned that the kernel range that affected.

Edit :

Latest learnt that kernel version 2.6.x are also...

After the publishing of the vulnerability, I do some study on this and find something that you may interested in.

The affected Linux kernel is from 3.0.8 to 3.7.9 that including Ubuntu 12.04 LTS...