oss-security - CVE request: Linux kernel: tuntap refuse to re-attach to different tun

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Message-ID: <alpine.LFD.2.03.1305101722130.22064@erqung.pbz>
Date: Fri, 10 May 2013 17:33:37 +0530 (IST)
From: P J P <ppandit@...hat.com>
To: oss security list <oss-security@...ts.openwall.com>
Subject: CVE request: Linux kernel: tuntap refuse to re-attach to different
 tun_struct

   Hello,

Linux kernels built with Universal TUN/TAP device driver(CONFIG_TUN) that 
includes multiqueue - ioctl(TUNSETQUEUE) - support, is vulnerable to a kernel 
crash while attaching a device to a new queue.

A user/program could use this flaw to crash the system resulting in DoS.

Upstream fix:
-------------
   -> https://git.kernel.org/linus/6e331f4c83021e4de2a2fc4981574b5d5b16c425
   -> https://git.kernel.org/linus/7c0c3b1a8a175437991ccc898ed66ec5e4a96208

Thank you.
--
Prasad J Pandit / Red Hat Security Response Team
DB7A 84C5 D3F9 7CD1 B5EB  C939 D048 7860 3655 602B

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