Bug 1259577 (CVE-2015-5157)

Summary:	CVE-2015-5157 kernel: x86-64: IRET faults during NMIs processing
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, aquini, arm-mgr, bhu, dhoward, dvlasenk, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, slawomir, slong, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way the Linux kernel handled IRET faults during the processing of NMIs. An unprivileged, local user could use this flaw to crash the system or, potentially (although highly unlikely), escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-05-05 09:59:15 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1259580, 1259581, 1259582, 1259583, 1259584, 1259585, 1259586
Bug Blocks:	1256394

Description Petr Matousek 2015-09-03 06:09:43 UTC

A flaw was found in the Linux kernel handles IRET faults during NMIs
processing.

An unprivileged local user could use this flaw to crash the system or,
potentially (though we believe it's unlikely), escalate their privileges
on the system.

Upstream patch:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=9b6e6a8334d56354853f9c255d1395c2ba570e0a

References:
http://www.openwall.com/lists/oss-security/2015/07/22/7

Acknowledgements:
Red Hat would like to thank Andy Lutomirski for reporting this issue.

Comment 1 Petr Matousek 2015-09-03 06:11:35 UTC

Statement:

This issue does affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2. Future updates in the respective releases may address this flaw.

Red Hat Enterprise Linux 5 is now in Production 3 Phase of the support and maintenance life cycle. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

Comment 6 errata-xmlrpc 2016-02-16 10:48:25 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:0212 https://rhn.redhat.com/errata/RHSA-2016-0212.html

Comment 7 errata-xmlrpc 2016-02-16 11:18:48 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:0185 https://rhn.redhat.com/errata/RHSA-2016-0185.html

Comment 8 errata-xmlrpc 2016-02-16 15:04:54 UTC

This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2016:0224 https://rhn.redhat.com/errata/RHSA-2016-0224.html

Comment 9 errata-xmlrpc 2016-05-04 00:32:47 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2016:0715 https://rhn.redhat.com/errata/RHSA-2016-0715.html