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Bug 1332139 - (CVE-2016-3713) CVE-2016-3713 kernel: kvm: out-of-bounds access in set_var_mtrr_msr
CVE-2016-3713 kernel: kvm: out-of-bounds access in set_var_mtrr_msr
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=20160516,repor...
: Security
Depends On: 1336410
Blocks: 1332140
  Show dependency tree / graph
 
Reported: 2016-05-02 07:04 EDT by Adam Mariš
Modified: 2018-08-28 18:05 EDT (History)
30 users (show)

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Doc Type: Bug Fix
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RHEL 7.3 requirements from Atomic Host:
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Attachments (Terms of Use)
Proposed patch (1.56 KB, patch)
2016-05-02 07:08 EDT, Adam Mariš 		no flags Details | Diff
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Description Adam Mariš 2016-05-02 07:04:39 EDT 
Linux kernel built with the Kernel-based Virtual Machine(CONFIG_KVM) with variable Memory Type Range Registers(MTRR) support is vulnerable to an out-of-bounds r/w access issue. It could occur while accessing processor's MTRRs via ioctl(2) calls.

A privileged user inside guest could use this flaw to manipulate host kernel's memory bytes leading to information disclosure or crashing the kernel resulting in DoS.

Upstream patch:
---------------
  -> https://lkml.org/lkml/2016/5/17/350

Reference:
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  -> http://www.openwall.com/lists/oss-security/2016/05/16/2
Comment 1 Adam Mariš 2016-05-02 07:04:45 EDT 
Acknowledgments:

Name: David Matlack (Google)
Comment 2 Adam Mariš 2016-05-02 07:08 EDT 
Created attachment 1152898 [details]
Proposed patch
Comment 3 Prasad J Pandit 2016-05-12 06:57:01 EDT 
Statement:

This issue does not affect the versions of the kernel package as shipped with
Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.
Comment 4 Prasad J Pandit 2016-05-16 08:02:12 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1336410]
Comment 5 Fedora Update System 2016-05-24 14:02:48 EDT 
kernel-4.5.5-300.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.
Comment 6 Fedora Update System 2016-06-01 16:23:07 EDT 
kernel-4.4.11-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2016-06-02 10:57:34 EDT 
kernel-4.5.5-201.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
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