[arch-security] [kernel] CVE-2014-2568 net: potential information leak when ubuf backed skbs are skb_zerocopy()ied

[Billy McCann]

[linux] CVE-2014-2568 net: potential information leak when ubuf backed
skbs are skb_zerocopy()ied

Description
"
An information leak flaw was found in the way skb_zerocopy() copied
skbs that are backed by userspace buffers (for example vhost-net and
recent xen netback). Once the source skb is consumed, ubuf destructor
is called and potentially releases the corresponding userspace
buffers, which can then for example be repurposed, while the
destination skb is still pointing to the them.
"

MITRE assignment
http://seclists.org/oss-sec/2014/q1/630

Upstream Patch
https://lkml.org/lkml/2014/3/20/421

Bug Report
https://bugs.archlinux.org/task/39566
Patch attached to bug report