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Date: Wed, 30 Oct 2013 15:52:31 +0100
From: Petr Matousek <>
Subject: CVE Request -- Linux kernel: ipc: ipc_rcu_putref refcount races

A flaw was found in the way ipc_rcu_putref() function handled reference
counter decrementing. Without external synchronization reference counter
might not be adjusted properly, as presented with the freeque() vs
do_msgsnd() race, leading to memory leaks.

An unprivileged local user could use this flaw to cause OOM conditions,
potentially crashing the system.


Upstream patch:
(making the refcounter atomic hunks)


Red Hat would like to thank Vladimir Davydov (Parallels) for reporting
this issue.

Petr Matousek / Red Hat Security Response Team

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