Bug 1035823 - (CVE-2013-6885) CVE-2013-6885 hw: AMD CPU erratum may cause core hang
CVE-2013-6885 hw: AMD CPU erratum may cause core hang
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On: 1035834 1035836
Blocks: 1035806
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Reported: 2013-11-28 09:57 EST by Petr Matousek
Modified: 2015-02-16 10:48 EST (History)
15 users (show)

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Fixed In Version:
Doc Type: Bug Fix
Doc Text:
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Last Closed: 2014-06-20 09:16:06 EDT
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RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2013-11-28 09:57:09 EST
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.



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 09:58:48 EST

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 12:44:04 EST
Xen issued advisory:

Comment 6 Vincent Danen 2014-02-19 16:42:10 EST
It was noted that the previous fix was not sufficient for 32bit systems and also requires the following patch:




The advisory has further details.

External References:

Comment 7 Andrew Jones 2014-02-20 06:42:14 EST
This shouldn't affect our backport. No additional patch needed for rhel5.
Comment 8 errata-xmlrpc 2014-03-12 14:30:18 EDT
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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