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Bug 1144883 - (CVE-2014-3610) CVE-2014-3610 kernel: kvm: noncanonical MSR writes
CVE-2014-3610 kernel: kvm: noncanonical MSR writes
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
: ---
: ---
Assigned To: Red Hat Product Security
impact=important,public=20141021,repo...
: Security
Depends On: 1144884 1144885 1152982 1152983 1156543
Blocks: 1144830
  Show dependency tree / graph
 
Reported: 2014-09-21 16:12 EDT by Petr Matousek
Modified: 2015-07-15 22:36 EDT (History)
26 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
It was found that KVM's Write to Model Specific Register (WRMSR) instruction emulation would write non-canonical values passed in by the guest to certain MSRs in the host's context. A privileged guest user could use this flaw to crash the host.
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Clone Of:
Environment:
Last Closed: 2015-04-22 07:05:10 EDT
Type: ---
Regression: ---
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Documentation: ---
CRM:
Verified Versions:
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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-2015:0869 normal SHIPPED_LIVE Important: kvm security update 2015-04-22 10:09:46 EDT

  None (edit)
Description Petr Matousek 2014-09-21 16:12:19 EDT 
If the guest writes a noncanonical value to certain MSR registers, KVM will
write that value to the MSR in the host context and a #GP will be raised
leading to kernel panic.

A privileged guest user can use this flaw to crash the host.

Enabling CONFIG_PARAVIRT when building the kernel mitigates this issue because wrmsrl() ends up invoking safe msr write variant.

Acknowledgements:

Red Hat would like to thank Lars Bull of Google and Nadav Amit for reporting
this issue.
Comment 5 Petr Matousek 2014-10-15 06:30:45 EDT 
Statement:

This issue does not affect Linux kernel packages as shipped with Red Hat Enterprise Linux 6 and 7. Future kvm package updates for Red Hat Enterprise Linux 5 may address this issue.
Comment 7 Petr Matousek 2014-10-24 12:09:38 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1156543]
Comment 8 Fedora Update System 2014-10-28 02:44:38 EDT 
kernel-3.16.6-203.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 9 Fedora Update System 2014-11-03 00:22:37 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 10 Fedora Update System 2014-11-16 09:46:13 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 2015-04-22 06:10:36 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5

Via RHSA-2015:0869 https://rhn.redhat.com/errata/RHSA-2015-0869.html
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