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Bug 1399528 - (CVE-2016-9644) CVE-2016-9644 kernel: Incorrect fix for CVE-2016-9178
CVE-2016-9644 kernel: Incorrect fix for CVE-2016-9178
Status: CLOSED NOTABUG
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
high Severity high
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Assigned To: Red Hat Product Security
impact=important,public=20161103,repo...
: Security
Depends On: 1415125
Blocks:
  Show dependency tree / graph
 
Reported: 2016-11-29 04:16 EST by Andrej Nemec
Modified: 2017-01-20 05:52 EST (History)
35 users (show)

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Last Closed: 2016-11-29 04:17:27 EST
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RHEL 7.3 requirements from Atomic Host:
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Description Andrej Nemec 2016-11-29 04:16:01 EST 
The __get_user_asm_ex macro in arch/x86/include/asm/uaccess.h in the Linux
kernel 4.4.22 through 4.4.28 contains extended asm statements that are
incompatible with the exception table, which allows local users to obtain root
access on non-SMEP platforms via a crafted application.  NOTE: this
vulnerability exists because of incorrect backporting of the CVE-2016-9178 patch
to older kernels.

Above refers to a new issue which affected some Linux stable lines, which backported 1c109fabbd51863475cd12ac206bdd249aee35af without also backporting 548acf19234dbda5a52d5a8e7e205af46e9da840.

References:

http://seclists.org/oss-sec/2016/q4/535
https://lwn.net/Articles/705264/

Upstream patches:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1c109fabbd51863475cd12ac206bdd249aee35af
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=548acf19234dbda5a52d5a8e7e205af46e9da840
Comment 2 Vladis Dronov 2017-01-20 05:51:47 EST 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1415125]
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