Bug 1364971 (CVE-2016-3841)

Summary:	CVE-2016-3841 kernel: use-after-free via crafted IPV6 sendmsg for raw / tcp / udp / l2tp sockets.
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	aquini, arm-mgr, bhu, dhoward, fhrbata, gansalmon, hmatsumo, iboverma, itamar, jforbes, jkacur, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, kstutsma, labbott, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, nmurray, plougher, pmatouse, rt-maint, rvrbovsk, security-response-team, vdronov, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	It was found that the Linux kernel's IPv6 implementation mishandled socket options. A local attacker could abuse concurrent access to the socket options to escalate their privileges, or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 02:57:24 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:	1286695, 1312740, 1364972, 1366974, 1374026
Bug Blocks:	1364973

Description Martin Prpič 2016-08-08 10:02:29 UTC

It was found that the Linux kernel's IPv6 implementation mishandles socket option data. A local attacker can abuse concurrent access to the socket options to escalate their privileges, or cause a denial of service (use-after-free and system crash) via a crafted sendmsg system call.

Upstream patch:

https://github.com/torvalds/linux/commit/45f6fad84cc305103b28d73482b344d7f5b76f39

Comment 1 Martin Prpič 2016-08-08 10:02:50 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1364972]

Comment 2 Justin M. Forbes 2016-08-08 17:41:20 UTC

This was fixed in upstream 4.4 kernels. All Fedora releases are currently shipping newer kernels than this which contain the listed fix.

Comment 6 Wade Mealing 2016-08-15 08:08:47 UTC

Statement:

This issue affects Red Hat Enterprise Linux 6 and 7 kernels.  This issue was fixed in a version 6 prior to this issue being raised.

As this issue is rated as important, it has been scheduled to be fixed in a future version of Red Hat Enterprise Linux 7.

Comment 12 errata-xmlrpc 2016-11-03 17:24:19 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 13 errata-xmlrpc 2016-11-03 19:56:43 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 16 errata-xmlrpc 2016-11-09 16:50:55 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7.2 Extended Update Support

Via RHSA-2016:2695 https://rhn.redhat.com/errata/RHSA-2016-2695.html