Bug 1403260 (CVE-2016-9919)

Summary:	CVE-2016-9919 kernel: Linux panic on fragemented IPv6 traffic (icmp6_send)
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, aquini, arm-mgr, bhu, dhoward, esammons, fhrbata, gansalmon, iboverma, ichavero, itamar, jforbes, jkacur, jkastner, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, sardella, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	The icmp6_send function in net/ipv6/icmp.c in the Linux kernel through 4.8.12 omits a certain check of the dst data structure which allows remote attackers to cause a denial of service (panic) via a fragmented IPv6 packet.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-12-13 08:51:18 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:	1403261
Bug Blocks:	1403262

Description Andrej Nemec 2016-12-09 14:26:29 UTC

The linux kernel contains a bug where a fragmented IPv6 packet causes a panic after a timeout (seems to be roughly 60 seconds). This can be triggered remotely via the internet and results in a DoS (kernel panic). The icmp6_send function in net/ipv6/icmp.c in the Linux kernel through 4.8.12 omits a certain check of the dst data structure, which allows remote attackers to cause a denial of service (panic) via a fragmented IPv6 packet.

Upstream bug:

https://bugzilla.kernel.org/show_bug.cgi?id=189851

Upstream patches:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=79dc7e3f1c

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=5d41ce29e3

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1d2f7b2d95

CVE assignment:

http://seclists.org/oss-sec/2016/q4/641

Comment 1 Andrej Nemec 2016-12-09 14:27:18 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1403261]

Comment 4 Vladis Dronov 2016-12-13 08:51:18 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG-2 as the code with the flaw is not present in the products listed.