Bug 1392439 (CVE-2016-9191)

Summary:	CVE-2016-9191 kernel: Local DoS via cgroup offline code
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, arm-mgr, bhu, dhoward, fhrbata, gansalmon, iboverma, ichavero, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, pholasek, plougher, rt-maint, rvrbovsk, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:01:51 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1392440
Bug Blocks:

Description Andrej Nemec 2016-11-07 14:06:16 UTC

A malicious user who can run an arbitrary image with a non-privileged user
in a Container-as-a-service cloud environment could use the exploit to
deadlock the container nodes to deny the service for other users.

This is confirmed to affect the latest mainline kernel (4.9-rc3) using this
kernel config, http://people.redhat.com/qcai/tmp/config-god-4.9rc2
and as old as v3.17. RHEL 7.3 kernel is not affected.

References:

http://seclists.org/oss-sec/2016/q4/340

Comment 1 Andrej Nemec 2016-11-07 14:07:09 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1392440]

Comment 2 Andrej Nemec 2017-01-30 08:35:45 UTC

Upstream patch:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=93362fa47fe98b62e4a34ab408c4a418432e7939