oss-security - CVE request -- Linux kernel: vhost: fix length for cross region descriptor

Follow @Openwall on Twitter for new release announcements and other news

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20130220004159.GU14748@dhcp-25-225.brq.redhat.com>
Date: Wed, 20 Feb 2013 01:41:59 +0100
From: Petr Matousek <pmatouse@...hat.com>
To: oss-security@...ts.openwall.com
Cc: Kurt Seifried <kseifrie@...hat.com>
Subject: CVE request -- Linux kernel: vhost: fix length for cross region
 descriptor

If a single descriptor crosses a region, the second chunk length should
be decremented by size translated so far, instead it includes the full
descriptor length. A privileged guest user could use this flaw to crash
the host or, potentially, corrupt host memory.

Upstream fix:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=bd97120fc3d1a11f3124c7c9ba1d91f51829eb85

References:
https://bugzilla.redhat.com/show_bug.cgi?id=912905

Thanks,
-- 
Petr Matousek / Red Hat Security Response Team

Please check out the Open Source Software Security Wiki, which is counterpart to this mailing list.

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.