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Bug 1104097 - (CVE-2014-3940) CVE-2014-3940 Kernel: missing check during hugepage migration
CVE-2014-3940 Kernel: missing check during hugepage migration
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
: ---
: ---
Assigned To: Red Hat Product Security
impact=moderate,public=20140318,repor...
: Security
Depends On: 1105037 1105038 1105039 1105040 1105041 1105042
Blocks: 1104017
  Show dependency tree / graph
 
Reported: 2014-06-03 05:34 EDT by Prasad J Pandit
Modified: 2015-07-31 03:21 EDT (History)
31 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
A flaw was found in the way Linux kernel's Transparent Huge Pages (THP) implementation handled non-huge page migration. A local, unprivileged user could use this flaw to crash the kernel by migrating transparent hugepages.
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Clone Of:
Environment:
Last Closed: 2015-07-22 15:27:06 EDT
Type: ---
Regression: ---
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Documentation: ---
CRM:
Verified Versions:
Category: ---
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-2014:0913 normal SHIPPED_LIVE Important: kernel-rt security update 2014-07-22 18:00:11 EDT
Red Hat Product Errata RHSA-2015:0290 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2015-03-05 11:13:58 EST
Red Hat Product Errata RHSA-2015:1272 normal SHIPPED_LIVE Moderate: kernel security, bug fix, and enhancement update 2015-07-22 07:56:25 EDT

  None (edit)
Description Prasad J Pandit 2014-06-03 05:34:56 EDT 
Linux kernel built with the HugeTLB file system(CONFIG_HUGETLBFS
+ CONFIG_HUGETLB_PAGE) along with Non Uniform Memory Access(CONFIG_NUMA)
support is vulnerable to possible race conditions. It could occur when kernel
attempts to perform hugepage migration.

Upstream fix:
-------------
  -> https://lkml.org/lkml/2014/3/18/784  (only part 1 of the 2 patches)
  Ie: mm: add !pte_present() check on existing hugetlb_entry callbacks

Reference:
----------
  -> http://seclists.org/oss-sec/2014/q2/399
Comment 1 Prasad J Pandit 2014-06-05 05:16:40 EDT 
Statement:

This issue did not affect the version of the kernel package as shipped with
Red Hat Enterprise Linux 5.
Comment 4 Prasad J Pandit 2014-06-05 05:27:22 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1105042]
Comment 7 Fedora Update System 2014-06-11 12:30:59 EDT 
kernel-3.14.6-200.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 8 Fedora Update System 2014-06-16 19:30:02 EDT 
kernel-3.14.7-100.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 9 John Kacur 2014-06-26 18:38:03 EDT 
commit d4c54919ed86302094c0ca7d48a8cbd4ee753e92 upstream
Comment 10 errata-xmlrpc 2014-07-22 14:04:32 EDT 
This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2014:0913 https://rhn.redhat.com/errata/RHSA-2014-0913.html
Comment 11 errata-xmlrpc 2015-03-05 07:15:51 EST 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2015:0290 https://rhn.redhat.com/errata/RHSA-2015-0290.html
Comment 12 errata-xmlrpc 2015-07-22 04:07:18 EDT 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2015:1272 https://rhn.redhat.com/errata/RHSA-2015-1272.html
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