Bug 1301893 (CVE-2016-2069) - CVE-2016-2069 kernel: race condition in the TLB flush logic
Summary: CVE-2016-2069 kernel: race condition in the TLB flush logic
Status: CLOSED ERRATA
Alias: CVE-2016-2069
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=20160125,repor...
Keywords: Security
Depends On: 1332601 1332602 1332603 1332604
Blocks: 1301883
TreeView+ depends on / blocked
 
Reported: 2016-01-26 09:58 UTC by Andrej Nemec
Modified: 2019-06-11 11:13 UTC (History)
11 users (show)

(edit)
A flaw was discovered in the way the Linux kernel dealt with paging structures. When the kernel invalidated a paging structure that was not in use locally, it could, in principle, race against another CPU that is switching to a process that uses the paging structure in question. A local user could use a thread running with a stale cached virtual->physical translation to potentially escalate their privileges if the translation in question were writable and the physical page got reused for something critical (for example, a page table).
Clone Of:
(edit)
Last Closed: 2019-06-08 02:47:48 UTC


Attachments (Terms of Use)


External Trackers
Tracker ID Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2016:2574 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2016-11-03 12:06:10 UTC
Red Hat Product Errata RHSA-2016:2584 normal SHIPPED_LIVE Important: kernel-rt security, bug fix, and enhancement update 2016-11-03 12:08:49 UTC
Red Hat Product Errata RHSA-2017:0817 normal SHIPPED_LIVE Moderate: kernel security, bug fix, and enhancement update 2017-03-21 13:06:51 UTC

Description Andrej Nemec 2016-01-26 09:58:16 UTC
A flaw was discovered in a way the Linux deals with paging structures.
When Linux invalidates a paging structure that is not in use locally, it could, in principle, race against another CPU that is switching to a process that uses the paging structure in question.

External reference:

http://seclists.org/oss-sec/2016/q1/194

Upstream fix:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=71b3c126e61177eb693423f2e18a1914205b165e

CVE assignment:

http://seclists.org/oss-sec/2016/q1/210

Comment 6 Vladis Dronov 2016-05-03 17:18:37 UTC
Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5. This has been rated as having Moderate security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.

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 7 errata-xmlrpc 2016-11-03 15:12:12 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html

Comment 8 errata-xmlrpc 2016-11-03 19:40:41 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html

Comment 9 errata-xmlrpc 2016-11-03 21:31:44 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html

Comment 10 errata-xmlrpc 2016-11-03 21:47:13 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html

Comment 11 errata-xmlrpc 2017-03-21 12:33:47 UTC
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2017:0817 https://rhn.redhat.com/errata/RHSA-2017-0817.html


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