Bug 862900 (CVE-2012-4461)

Summary:	CVE-2012-4461 kernel: kvm: invalid opcode oops on SET_SREGS with OSXSAVE bit set
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, anton, dhoward, fhrbata, gleb, juzhang, kernel-mgr, knoel, lersek, lwang, michen, mtosatti, pbonzini, security-response-team, sforsber, shuang, xfu
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:	2013-05-30 14:35:20 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:	862903, 862904, 878518, 953234
Bug Blocks:	862923

Description Petr Matousek 2012-10-03 20:36:26 UTC

A flaw has been found in the way Linux kernel's KVM subsystem handled vcpu->arch.cr4 X86_CR4_OSXSAVE bit set upon guest enter. On hosts without the XSAVE feature an unprivileged local user could use this flaw to crash the system.

Acknowledgements:

Red Hat would like to thank Jon Howell for reporting this issue.

Comment 3 Petr Matousek 2012-10-03 20:42:55 UTC

Statement:

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

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 MRG 2.

Comment 30 Petr Matousek 2012-11-06 18:26:33 UTC

Public now via http://article.gmane.org/gmane.comp.emulators.kvm.devel/100742

Comment 31 Petr Matousek 2012-11-13 11:00:15 UTC

Upstream fix:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=6d1068b3a98519247d8ba4ec85cd40ac136dbdf9

Comment 34 Fedora Update System 2012-11-22 03:52:15 UTC

kernel-3.6.7-4.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 35 Fedora Update System 2012-11-27 04:42:17 UTC

kernel-3.6.7-5.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 36 Fedora Update System 2012-11-28 11:31:32 UTC

kernel-3.6.7-4.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 37 errata-xmlrpc 2013-02-05 19:55:59 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2013:0223 https://rhn.redhat.com/errata/RHSA-2013-0223.html

Comment 39 errata-xmlrpc 2013-05-30 18:31:24 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