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Date: Fri, 31 Aug 2012 12:37:58 -0700
From: akuster <>
To: Petr Matousek <>
Subject: Re: CVE Request -- kernel: net: slab corruption due
 to improper synchronization around inet->opt


Is there a range of affected kernel versions?

Was this issue introduced by 1c32c5ad6fac8cee1a77449f5abf211e911ff830?

- Armin

On 08/31/2012 09:11 AM, 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.
> Upstream fix:
> Thanks,

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