Bug 1470659 (CVE-2017-11176)

Summary:	CVE-2017-11176 kernel: Use-after-free in sys_mq_notify()
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:	alexander.lin, apmukher, aquini, bhu, blc, dhoward, fhrbata, gansalmon, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, madhu.chinakonda, matt, mchehab, mcressma, mlangsdo, nmurray, pholasek, plougher, pmatouse, rt-maint, rvrbovsk, sardella, srikar.betarapalli, williams, wmealing, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	A use-after-free flaw was found in the Netlink functionality of the Linux kernel networking subsystem. Due to the insufficient cleanup in the mq_notify function, a local attacker could potentially use this flaw to escalate their privileges on the system.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-06-08 03:16:25 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:	1470660, 1476122, 1476123, 1476124, 1476125, 1476126, 1476127, 1476128, 1476129, 1476130, 1476131
Bug Blocks:	1470663

Description Adam Mariš 2017-07-13 12:13:50 UTC

The mq_notify function in the Linux kernel through 4.11.9 does not set the sock pointer to NULL upon entry into the retry logic. During a user-space close of a Netlink socket, it allows attackers to possibly cause a situation where a value may be used after being freed (Use after free) which may lead to memory corruption or other unspecified other impact.

Upstream patch:

https://github.com/torvalds/linux/commit/f991af3daabaecff34684fd51fac80319d1baad1

Mitre advisory: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-11176

What is use after free: https://access.redhat.com/use-after-free-flaw-type

Comment 1 Adam Mariš 2017-07-13 12:14:42 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1470660]

Comment 2 Fedora Update System 2017-07-23 22:55:03 UTC

kernel-4.11.11-200.fc25 has been pushed to the Fedora 25 stable repository. If problems still persist, please make note of it in this bug report.

Comment 7 Eric Christensen 2017-10-10 18:44:42 UTC

Statement:

This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5,6,7 and MRG-2.  Future Linux kernel updates for the respective releases may address this issue.

Comment 8 errata-xmlrpc 2017-10-19 13:26:00 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise MRG 2

Via RHSA-2017:2918 https://access.redhat.com/errata/RHSA-2017:2918

Comment 9 errata-xmlrpc 2017-10-19 15:05:41 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2930 https://access.redhat.com/errata/RHSA-2017:2930

Comment 10 errata-xmlrpc 2017-10-19 15:09:20 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2017:2931 https://access.redhat.com/errata/RHSA-2017:2931

Comment 11 errata-xmlrpc 2018-01-25 11:31:22 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 6

Via RHSA-2018:0169 https://access.redhat.com/errata/RHSA-2018:0169

Comment 13 errata-xmlrpc 2018-12-12 14:53:35 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 5 Extended Lifecycle Support

Via RHSA-2018:3822 https://access.redhat.com/errata/RHSA-2018:3822