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Date: Tue, 11 Mar 2014 09:50:45 -0700
From: Chris Palmer <>
Subject: Re: CVE-2014-0131 -- kernel: net: use-after-free
 during segmentation with zerocopy

It would be nice to clarify this bug description. It's a kernel memory
disclosure bug (not a memory leak in the sense of failing to collect
garbage). Although UAF is often worse than that, it's not in this case,
because there's 0 chance the after-free-user of the fragment will think the
fragment is bigger than it is and subsequently write too much data into it.

Is that right?
On Mar 10, 2014 9:41 AM, "Petr Matousek" <> wrote:

> A flaw was found in the way segmentation was performed on skbs
> originated from vhost-net when zerocopy feature was enabled.
> This flaw could be potentially used to leak kernel memory.
> Upstream patch submission:
> --
> Petr Matousek / Red Hat Security Response Team
> PGP: 0xC44977CA 8107 AF16 A416 F9AF 18F3  D874 3E78 6F42 C449 77CA

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