Bug 1079012 (CVE-2014-2568) - CVE-2014-2568 kernel: net: potential information leak when ubuf backed skbs are skb_zerocopy()ied
Summary: CVE-2014-2568 kernel: net: potential information leak when ubuf backed skbs a...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2014-2568
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1079013 1079014 1091345
Blocks: 1078818
TreeView+ depends on / blocked
 
Reported: 2014-03-20 18:14 UTC by Petr Matousek
Modified: 2021-02-17 06:44 UTC (History)
34 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-06-24 16:41:48 UTC

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2014:0786 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2014-06-24 19:58:32 UTC

Description Petr Matousek 2014-03-20 18:14:13 UTC 
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.

Upstream patch:
https://lkml.org/lkml/2014/3/20/421
Comment 1 Petr Matousek 2014-03-20 18:15:43 UTC 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.
Comment 3 Petr Matousek 2014-03-20 18:18:26 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1079013]
Comment 4 Murray McAllister 2014-03-21 01:26:19 UTC 
MITRE assigned CVE-2014-2568 to this issue:

http://seclists.org/oss-sec/2014/q1/630
Comment 5 Josh Boyer 2014-03-28 13:09:19 UTC 
Upstream commit:

https://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=36d5fe6a000790f56039afe26834265db0a3ad4c
Comment 6 Fedora Update System 2014-04-04 09:46:14 UTC 
kernel-3.13.8-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2014-04-09 00:51:46 UTC 
kernel-3.13.9-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 10 errata-xmlrpc 2014-06-24 15:58:48 UTC 
This issue has been addressed in following products:

  Red Hat Enterprise Linux 7

Via RHSA-2014:0786 https://rhn.redhat.com/errata/RHSA-2014-0786.html
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