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Date: Tue, 19 Mar 2013 10:16:25 +0400
From: Solar Designer <>
Subject: Re: CVE Request -- kernel: net: slab corruption due to improper synchronization around inet->opt

On Fri, Aug 31, 2012 at 06:11:53PM +0200, Petr Matousek wrote:
> Description of the problem:
> Lack proper synchronization to manipulate inet->opt ip_options can lead
> to system crash.
> Problem is that ip_make_skb() calls ip_setup_cork() and ip_setup_cork()
> possibly makes a copy of ipc->opt (struct ip_options), without any
> protection against another thread manipulating inet->opt. Another thread
> can change inet->opt pointer and free old one under us.
> Given right server application (setting socket options and processing
> traffic over the same socket at the same time), remote attacker could
> use this flaw to crash the system. More likely though, local
> unprivileged user could use this flaw to crash the system.

What are our reasons to claim that this is merely a DoS, as opposed to a
potential for arbitrary code execution with kernel privileges (at least
in the local attack case)?

> Upstream fix:

This was assigned CVE-2012-3552:


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