Bug 1079012 (CVE-2014-2568)

Summary:	CVE-2014-2568 kernel: net: potential information leak when ubuf backed skbs are skb_zerocopy()ied
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, anton, aquini, bhu, carnil, davej, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jkurik, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mmcallis, mst, npajkovs, pholasek, plougher, rt-maint, rvrbovsk, williams
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-06-24 16:41:48 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1079013, 1079014, 1091345
Bug Blocks:	1078818

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