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CVE-2013-1792 Linux kernel: KEYS: race with concurrent install_user_keyrings()
From: P J P <ppandit () redhat com>
Date: Thu, 7 Mar 2013 13:05:37 +0530 (IST)

   Hello,

Mateusz Guzik of Red Hat discovered a race condition in install_user_keyrings() routine, leading to a NULL pointer dereference. It occurs during parallel invocation of the install_user_keyrings & lookup_user_key routines, for the same user, if `uid' and `uid-session' keyrings are not yet created.

An unprivileged user could use this flaw to crash the system, resulting in DoS.

Upstream fix:
-------------
 -> https://lkml.org/lkml/2013/3/6/535

Reference:
----------
 -> https://bugzilla.redhat.com/show_bug.cgi?id=916646

Thank you.
--
Prasad J Pandit / Red Hat Security Response Team
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