Bug 1338625 (CVE-2016-4951)

Summary:	CVE-2016-4951 kernel: Null pointer dereference in tipc_nl_publ_dump
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:	agordeev, aquini, arm-mgr, bhu, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kstutsma, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, pmatouse, 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:	A vulnerability was found in the Linux kernel. The pointer to the netlink socket attribute is not checked, which could cause a null pointer dereference when parsing the nested attributes in function tipc_nl_publ_dump(). This allows local users to cause a DoS.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-06-15 11:38:52 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:	1338626, 1346815
Bug Blocks:	1338627

Description Andrej Nemec 2016-05-23 07:20:11 UTC

A vulnerability was found in the Linux kernel. The pointer to the netlink socket attribute is not checked, which could cause a null pointer dereference when parsing the nested attributes in function tipc_nl_publ_dump. This allows local users to cause a DoS.

References:

http://lists.openwall.net/netdev/2016/05/14/28

http://lists.openwall.net/netdev/2016/05/16/26

CVE-ID request and assignment:

http://seclists.org/oss-sec/2016/q2/385

http://seclists.org/oss-sec/2016/q2/386

Introduced by:

https://github.com/torvalds/linux/commit/1a1a143daf84db95dd7212086042004a3abb7bc2

Upstream fix:

https://github.com/torvalds/linux/commit/45e093ae2830cd1264677d47ff9a95a71f5d9f9c

Comment 1 Andrej Nemec 2016-05-23 07:21:37 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1338626]

Comment 2 Fedora Update System 2016-06-01 20:23:48 UTC

kernel-4.4.11-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 3 Fedora Update System 2016-06-08 22:53:26 UTC

kernel-4.5.6-200.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 6 Vladis Dronov 2016-06-15 11:38:52 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG-2, as there is no code which introduced the flaw in the products listed.

Comment 8 Fedora Update System 2016-06-18 18:49:42 UTC

kernel-4.5.6-300.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.