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Date: Wed, 20 Feb 2013 01:41:59 +0100
From: Petr Matousek <>
Cc: Kurt Seifried <>
Subject: CVE request -- Linux kernel: vhost: fix length for cross region

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:;a=commitdiff;h=bd97120fc3d1a11f3124c7c9ba1d91f51829eb85


Petr Matousek / Red Hat Security Response Team

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