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Date: Wed, 26 Oct 2011 09:26:36 -0600
From: Kurt Seifried <>
Subject: Re: CVE Request -- kernel: sysctl: restrict write
 access to dmesg_restrict

On 10/26/2011 09:16 AM, Petr Matousek wrote:
> When dmesg_restrict is set to 1 CAP_SYS_ADMIN is needed to read the
> kernel ring buffer. But a root user without CAP_SYS_ADMIN is able
> to reset dmesg_restrict to 0.
> This is an issue when e.g.  LXC (Linux Containers) are used and complete
> user space is running without CAP_SYS_ADMIN.  A unprivileged and jailed
> root user can bypass the dmesg_restrict protection.
> Introduced by:
> eaf06b241b091357e72b76863ba16e89610d31bd
> Fixed by:
> bfdc0b497faa82a0ba2f9dddcf109231dd519fcc
> Thanks,
Please use CVE-2011-4080 for this issue.


-Kurt Seifried / Red Hat Security Response Team

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