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Bug 1391908 - (CVE-2016-9178) CVE-2016-9178 kernel: Information leak in get_user_ex function
CVE-2016-9178 kernel: Information leak in get_user_ex function
Status: CLOSED WONTFIX
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
low Severity low
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Assigned To: Red Hat Product Security
impact=low,public=20160915,reported=2...
: Reopened, Security
Depends On: 1391910
Blocks: 1391915
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Reported: 2016-11-04 07:12 EDT by Andrej Nemec
Modified: 2017-01-20 09:36 EST (History)
36 users (show)

See Also:
Fixed In Version:
Doc Type: Bug Fix
Doc Text:
The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel before 4.7.5 does not initialize a certain integer variable, which allows local users to obtain sensitive information from kernel stack memory by triggering failure of a get_user_ex call.
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Environment:
Last Closed: 2017-01-20 05:34:20 EST
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CRM:
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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Description Andrej Nemec 2016-11-04 07:12:05 EDT 
An information leak was found in the Linux kernel. The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux kernel before 4.7.5 does not initialize a certain integer variable, which allows local users to obtain sensitive information from kernel stack memory by triggering failure of a get_user_ex call.

References:

http://seclists.org/oss-sec/2016/q4/320

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c109fabbd51863475cd12ac206bdd249aee35af
Comment 1 Andrej Nemec 2016-11-04 07:13:03 EDT 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1391910]
Comment 2 Justin M. Forbes 2016-11-04 12:24:42 EDT 
This issue was fixed in 4.7.5 stable updates across all Fedora releases.
Comment 5 Vladis Dronov 2017-01-20 05:34:20 EST 
Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 as the code which can trigger the flaw is not present in the products listed.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 6, 7 and MRG-2. This has been rated as having Low 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/.
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