Bug 1549421 (CVE-2017-18193)

Summary:	CVE-2017-18193 kernel: Mishandled extent trees in fs/f2fs/extent_cache.c can allow a local user to cause a denial of service
Product:	[Other] Security Response	Reporter:	Sam Fowler <sfowler>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	aquini, bhu, blc, dhoward, esammons, fhrbata, hkrzesin, hwkernel-mgr, iboverma, jforbes, jkacur, jross, kernel-mgr, lgoncalv, lwang, matt, mcressma, mguzik, mlangsdo, nmurray, plougher, rt-maint, rvrbovsk, skozina, vdronov, williams, yozone
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kernel 4.13	Doc Type:	If docs needed, set a value
Doc Text:	fs/f2fs/extent_cache.c in the Linux kernel, before 4.13, mishandles extent trees. This allows local users to cause a denial of service via an application with multiple threads.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-03-02 14:03:32 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:	1550994
Bug Blocks:	1549422

Description Sam Fowler 2018-02-27 04:18:56 UTC

fs/f2fs/extent_cache.c in the Linux kernel before 4.13 mishandles extent trees, which allows local users to cause a denial of service via an application with multiple threads.

An upstream patch:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=dad48e73127ba10279ea33e6dbc8d3905c4d31c0

Comment 2 Vladis Dronov 2018-03-02 14:00:03 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1550994]

Comment 4 Vladis Dronov 2018-03-02 14:03:32 UTC

Statement:

This issue does not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 5, 6, 7, its real-time kernel, Red Hat Enterprise MRG 2, Red Hat Enterprise Linux 7 for ARM 64 and Red Hat Enterprise Linux 7 for Power 9 LE, as the code with the flaw is not built and shipped in the products listed.

Comment 5 Justin M. Forbes 2018-03-02 21:19:23 UTC

This issue was fixed for Fedora with the 4.13 kernel rebases.