Bug 1399711 (CVE-2015-8961)

Summary:	CVE-2015-8961 kernel: Use after free in __ext4_journal_stop
Product:	[Other] Security Response	Reporter:	Adam Mariš <amaris>
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, 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, 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:	A flaw was found in the ext4 subsystem. This vulnerability is a use after free vulnerability was found in __ext4_journal_stop(). Attackers could abuse this to allow any code which attempts to deal with the journal failure to be mishandled or not fail at all. This could lead to data corruption or crashes.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-02-09 13:22:59 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:
Bug Blocks:	1395238

Description Adam Mariš 2016-11-29 15:28:50 UTC

A flaw was found in the ext4 subsystem.  This vulnerability is a use after free vulnerability was found in __ext4_journal_stop() introduced by commit 9705acd63b125dee8b15c705216d7186daea4625.

Attackers could abuse this to allow any code which attempts to deal with the journal failure, to be mishandled or not a failure at all.  This could lead to data corruption or crashes.

Upstream patch:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6934da9238da947628be83635e365df41064b09b


Reference:

https://source.android.com/security/bulletin/2016-11-01.html#eop-in-kernel-file-system

Comment 1 Wade Mealing 2016-12-02 04:00:26 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6, 7 and MRG 2.x. This issue has been rated as having moderate security impact.