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Bug 1422825 - (CVE-2017-6001) CVE-2017-6001 kernel: Race condition between multiple sys_perf_event_open() calls
CVE-2017-6001 kernel: Race condition between multiple sys_perf_event_open() c...
Status: NEW
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=20170114,repor...
: Security
Depends On: 1434752 1422827 1434751 1434753 1434754
Blocks: 1422826
  Show dependency tree / graph
 
Reported: 2017-02-16 05:59 EST by Andrej Nemec
Modified: 2018-08-28 18:13 EDT (History)
34 users (show)

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Doc Text:
It was found that the original fix for CVE-2016-6786 was incomplete. There exist a race between two concurrent sys_perf_event_open() calls when both try and move the same pre-existing software group into a hardware context.
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RHEL 7.3 requirements from Atomic Host:
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External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2017:1842 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2017-08-01 14:22:09 EDT
Red Hat Product Errata RHSA-2017:2077 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2017-08-01 14:13:37 EDT
Red Hat Product Errata RHSA-2017:2669 normal SHIPPED_LIVE Important: kernel-rt security and bug fix update 2017-09-06 20:36:52 EDT
Red Hat Product Errata RHSA-2018:1854 None None None 2018-06-19 00:47 EDT

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Description Andrej Nemec 2017-02-16 05:59:29 EST 
It was found that the original fix for CVE-2016-6786 was incomplete. There exist a race between two concurrent sys_perf_event_open() calls when both try and move the same pre-existing software group into a hardware context.

References:

https://marc.info/?l=linux-kernel&m=148370849716035
http://seclists.org/oss-sec/2017/q1/446

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=321027c1fe77f892f4ea07846aeae08cefbbb290
Comment 1 Andrej Nemec 2017-02-16 06:03:17 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1422827]
Comment 2 Justin M. Forbes 2017-02-16 07:57:40 EST 
This was fixed in the 4.9.7 stable update available to all Fedora releases.
Comment 4 Vladis Dronov 2017-03-22 05:49:35 EDT 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the perf subsystem where the flaw was found is not present in this product.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.
Comment 10 errata-xmlrpc 2017-08-01 15:13:12 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2077 https://access.redhat.com/errata/RHSA-2017:2077
Comment 11 errata-xmlrpc 2017-08-02 03:53:17 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:1842 https://access.redhat.com/errata/RHSA-2017:1842
Comment 12 errata-xmlrpc 2017-09-06 16:40:08 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2669 https://access.redhat.com/errata/RHSA-2017:2669
Comment 13 errata-xmlrpc 2018-06-19 00:47:09 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:1854 https://access.redhat.com/errata/RHSA-2018:1854
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