Bug 1035823 (CVE-2013-6885) - CVE-2013-6885 hw: AMD CPU erratum may cause core hang
Summary: CVE-2013-6885 hw: AMD CPU erratum may cause core hang
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2013-6885
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard: impact=moderate,public=20131128,repor...
Depends On: 1035834 1035836
Blocks: 1035806
TreeView+ depends on / blocked
 
Reported: 2013-11-28 14:57 UTC by Petr Matousek
Modified: 2019-06-08 19:48 UTC (History)
15 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-06-20 13:16:06 UTC


Attachments (Terms of Use)


Links
System ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2014:0285 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2014-03-12 22:28:54 UTC

Description Petr Matousek 2013-11-28 14:57:09 UTC
793 Specific Combination of Writes to Write Combined Memory
Types and Locked Instructions May Cause Core Hang

Under a highly specific and detailed set of internal timing
conditions, a locked instruction may trigger a timing sequence whereby
the write to a write combined memory type is not flushed, causing the
locked instruction to stall indefinitely.

Potential Effect on System
Processor core hang.

Suggested Workaround
BIOS should set MSRC001_1020[15] = 1b.

The vulnerability is applicable only to family 16h model 00h-0fh AMD
CPUs. Non-AMD CPUs are not vulnerable.

References:
http://support.amd.com/TechDocs/51810_16h_00h-0Fh_Rev_Guide.pdf
http://thread.gmane.org/gmane.comp.security.oss.general/11555

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Jan Beulich as the original reporter.

Comment 2 Petr Matousek 2013-11-28 14:58:48 UTC
Statement:

This hardware issue is affecting certain AMD processors. Please consult your hardware vendor for any potential firmware updates providing a workaround for this issue.

Comment 4 Petr Matousek 2013-12-02 17:44:04 UTC
Xen issued advisory:

  http://www.openwall.com/lists/oss-security/2013/12/02/1

Comment 6 Vincent Danen 2014-02-19 21:42:10 UTC
It was noted that the previous fix was not sufficient for 32bit systems and also requires the following patch:

http://xenbits.xenproject.org/xsa/xsa82-4.1-32bit.patch

or

http://xenbits.xenproject.org/xsa/xsa82-4.2-32bit.patch

The advisory has further details.


External References:

http://xenbits.xenproject.org/xsa/advisory-82.html

Comment 7 Andrew Jones 2014-02-20 11:42:14 UTC
This shouldn't affect our backport. No additional patch needed for rhel5.

Comment 8 errata-xmlrpc 2014-03-12 18:30:18 UTC
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2014:0285 https://rhn.redhat.com/errata/RHSA-2014-0285.html


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