Bug 912905 (CVE-2013-0311)

Summary:	CVE-2013-0311 kernel: vhost: fix length for cross region descriptor
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, anton, bhu, davej, dhoward, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jneedle, jonathan, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, mcressma, npajkovs, plougher, rt-maint, rvrbovsk, sforsber, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-05-09 06:14:11 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:	862265, 953214, 953215
Bug Blocks:	961202

Description Petr Matousek 2013-02-20 00:37:08 UTC

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

Comment 1 Petr Matousek 2013-02-20 00:49:15 UTC

Statement:

This issue did affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 6.

This issue did not affect the version of Linux kernel as shipped with Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.

Comment 2 errata-xmlrpc 2013-02-21 07:03:49 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0496 https://rhn.redhat.com/errata/RHSA-2013-0496.html

Comment 3 errata-xmlrpc 2013-02-28 18:59:35 UTC

This issue has been addressed in following products:

  RHEV-H and Agents for RHEL-6

Via RHSA-2013:0579 https://rhn.redhat.com/errata/RHSA-2013-0579.html

Comment 5 errata-xmlrpc 2013-05-30 18:31:59 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.2 EUS - Server Only

Via RHSA-2013:0882 https://rhn.redhat.com/errata/RHSA-2013-0882.html

Comment 6 errata-xmlrpc 2013-06-11 17:39:26 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6.3 EUS - Server Only

Via RHSA-2013:0928 https://rhn.redhat.com/errata/RHSA-2013-0928.html