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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: 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: impact=moderate,public=20161105,reported=20161105,source=oss-security,cvss2=5.2/AV:A/AC:M/Au:S/C:N/I:N/A:C,cvss3=5.5/CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H,cwe=CWE-400,rhel-5/kernel=notaffected,rhel-6/kernel=notaffected,rhel-7/kernel=notaffected,rhel-7/kernel-rt=notaffected,mrg-2/realtime-kernel=notaffected,rhelsa-7/arm-kernel=notaffected,fedora-all/kernel=affected
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:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
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]