Bug 862900 - (CVE-2012-4461) CVE-2012-4461 kernel: kvm: invalid opcode oops on SET_SREGS with OSXSAVE bit set
CVE-2012-4461 kernel: kvm: invalid opcode oops on SET_SREGS with OSXSAVE bit set
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20121106,repor...
: Security
Depends On: 862903 862904 878518 953234
Blocks: 862923
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Reported: 2012-10-03 16:36 EDT by Petr Matousek
Modified: 2015-02-16 10:53 EST (History)
17 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-05-30 10:35:20 EDT
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Description Petr Matousek 2012-10-03 16:36:26 EDT
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 16:42:55 EDT
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 13:26:33 EST
Public now via http://article.gmane.org/gmane.comp.emulators.kvm.devel/100742
Comment 34 Fedora Update System 2012-11-21 22:52:15 EST
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 2012-11-26 23:42:17 EST
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 06:31:32 EST
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 14:55:59 EST
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 14:31:24 EDT
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

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