Bug 1333712 (CVE-2016-4581)

Summary:	CVE-2016-4581 kernel: Slave being first propagated copy causes oops in propagate_mnt
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	andy.fletcher, aquini, arm-mgr, bhu, dhoward, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kstutsma, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, plougher, rt-maint, rvrbovsk, slawomir, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:51:18 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1333713, 1335979, 1338808, 1338809, 1338810, 1338811, 1338812
Bug Blocks:	1333727

Description Adam Mariš 2016-05-06 08:07:37 UTC

It was reported that when first propagated copy is a slave, it causes kernel oops. This oops happens with the namespace_sem held and can be triggered by non-root users.

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5ec0811d30378ae104f250bfc9b3640242d81e3f

Comment 1 Adam Mariš 2016-05-06 08:08:43 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1333713]

Comment 3 Adam Mariš 2016-05-11 15:38:27 UTC

CVE-ID request and assignment:

http://seclists.org/oss-sec/2016/q2/313

http://seclists.org/oss-sec/2016/q2/318

Comment 4 Vladis Dronov 2016-05-13 17:00:42 UTC

Acknowledgements:

Name: Eric W. Biederman (Red Hat)

Comment 6 Fedora Update System 2016-05-14 23:22:53 UTC

kernel-4.5.4-300.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2016-05-16 14:52:34 UTC

kernel-4.4.9-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 8 Vladis Dronov 2016-05-23 13:11:44 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, as there is no user namespace support in the products listed.

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. Future Linux kernel updates for the respective releases might address this issue.

Comment 12 Fedora Update System 2016-06-02 14:59:44 UTC

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.

Comment 13 errata-xmlrpc 2016-11-03 16:28:19 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html

Comment 14 errata-xmlrpc 2016-11-03 19:49:55 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html

Comment 15 errata-xmlrpc 2016-11-03 21:34:14 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2574 https://rhn.redhat.com/errata/RHSA-2016-2574.html

Comment 16 errata-xmlrpc 2016-11-03 21:49:33 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2016:2584 https://rhn.redhat.com/errata/RHSA-2016-2584.html