Bug 1549427 (CVE-2018-7480)

Summary:	CVE-2018-7480 kernel: Double free in block/blk-cgroup.c:blkcg_init_queue() 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:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aquini, bhu, blc, dhoward, esammons, fhrbata, hkrzesin, hwkernel-mgr, iboverma, 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 4.11	Doc Type:	If docs needed, set a value
Doc Text:	The blkcg_init_queue function in block/blk-cgroup.c in the Linux kernel, before 4.11, allows local users to cause a denial of service (double free) or possibly have unspecified other impact by triggering a creation failure.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2018-03-01 09:21:50 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:	1549429

Description Sam Fowler 2018-02-27 04:34:34 UTC

The blkcg_init_queue function in block/blk-cgroup.c in the Linux kernel before 4.11 allows local users to cause a denial of service (double free) or possibly have unspecified other impact by triggering a creation failure.

References:

https://marc.info/?t=148611364100003&r=1&w=2

An upstream commit:

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9b54d816e00425c3a517514e0d677bb3cec49258

Comment 3 Vladis Dronov 2018-03-01 09:21:50 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 present in the products listed.