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Date: Wed, 21 Dec 2011 15:20:12 -0700
From: Kurt Seifried <>
Subject: Re: CVE Request -- kernel: tight loop and no preemption
 can cause system stall

On 12/21/2011 03:10 PM, Petr Matousek wrote:
> A tight loop in user level process isn't preempted unless a realtime
> process is woken up on the cpu.  Some important kernel threads such as
> events/*, kblockd/* can be blocked by the process, and the machine
> stalls.
> Unprivileged local user could use this flaw to DoS the system.
> Upstream commit:
> f26f9aff6aaf67e9a430d16c266f91b13a5bff64
> Reference:
> Thanks,
Please use CVE-2011-4621 for this issue.


-Kurt Seifried / Red Hat Security Response Team

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