Bug 1153322 – CVE-2014-3690 kernel: kvm: vmx: invalid host cr4 handling across vm entries

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Bug 1153322 - (CVE-2014-3690) CVE-2014-3690 kernel: kvm: vmx: invalid host cr4 handling across vm entries

Summary:	CVE-2014-3690 kernel: kvm: vmx: invalid host cr4 handling across vm entries

Status:	NEW

Aliases:	CVE-2014-3690

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20141021,repor...
Keywords:	Security

Depends On:	1153326 1153327 1153328 1153329 1155372 1170559
Blocks:	1153325
	Show dependency tree / graph

Reported:	2014-10-15 15:02 EDT by Petr Matousek
Modified:	2018-08-28 17:55 EDT (History)
CC List:	13 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:	It was found that the Linux kernel's KVM implementation did not ensure that the host CR4 control register value remained unchanged across VM entries on the same virtual CPU. A local, unprivileged user could use this flaw to cause a denial of service on the system.
Story Points:	---
Clone Of:
Environment:
Last Closed:
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

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External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2015:0290	normal	SHIPPED_LIVE	Important: kernel security, bug fix, and enhancement update	2015-03-05 11:13:58 EST
Red Hat Product Errata	RHSA-2015:0782	normal	SHIPPED_LIVE	Important: kernel security and bug fix update	2015-04-07 15:08:32 EDT
Red Hat Product Errata	RHSA-2015:0864	normal	SHIPPED_LIVE	Important: kernel security and bug fix update	2015-04-21 15:00:52 EDT

Groups: None (edit)

Description Petr Matousek 2014-10-15 15:02:42 EDT

It was found that the host cr4 value can change across vm entries on the same
vcpu and yet it was being treated as being constant. This can interfere with,
for example, PR_SET_TSC settings (cr4/TSD bit), leading to inconsistent state.

A local, unprivileged user could use this flaw to cause denial of service on
the system.

Acknowledgements:

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

Comment 1 Petr Matousek 2014-10-15 15:03:05 EDT

Statement:

This issue does affects the Linux kernel packages as shipped with Red Hat
Enterprise Linux 6 and 7. Future updates may address this issue in the
respective Red Hat Enterprise Linux releases.

This issue does affect the kvm packages as shipped with Red Hat Enterprise Linux 5, even though the impact is limited.

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 5 Murray McAllister 2014-10-21 23:05:53 EDT

This issue is public now:

http://seclists.org/oss-sec/2014/q4/416

Upstream fix:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=d974baa398f34393db76be45f7d4d04fbdbb4a0a

Comment 6 Murray McAllister 2014-10-21 23:08:49 EDT

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1155372]

Comment 7 Fedora Update System 2014-10-28 02:43:04 EDT

kernel-3.16.6-202.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Fedora Update System 2014-11-03 00:22:53 EST

kernel-3.17.2-300.fc21 has been pushed to the Fedora 21 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 9 Fedora Update System 2014-11-16 09:46:30 EST

kernel-3.14.23-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 11 errata-xmlrpc 2015-03-05 07:52:54 EST

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0290 https://rhn.redhat.com/errata/RHSA-2015-0290.html

Comment 12 errata-xmlrpc 2015-04-07 11:12:46 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6.5 EUS - Server and Compute Node Only

Via RHSA-2015:0782 https://rhn.redhat.com/errata/RHSA-2015-0782.html

Comment 13 errata-xmlrpc 2015-04-21 11:01:25 EDT

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:0864 https://rhn.redhat.com/errata/RHSA-2015-0864.html

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