Bug 1251839 (CVE-2015-6252)

Summary:	CVE-2015-6252 kernel: vhost fd leak in ioctl VHOST_SET_LOG_FD
Product:	[Other] Security Response	Reporter:	Wade Mealing <wmealing>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	low	Docs Contact:
Priority:	low
Version:	unspecified	CC:	agordeev, aquini, arm-mgr, bhu, carnil, dhoward, fhrbata, gansalmon, itamar, jkacur, joelsmith, jonathan, kernel-maint, kernel-mgr, kstutsma, lgoncalv, lwang, madhu.chinakonda, mchehab, mguzik, nmurray, pholasek, plougher, pmatouse, rt-maint, rvrbovsk, slong, vgoyal, vkaigoro, williams, wmealing
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw was found in the way the Linux kernel's vhost driver treated userspace provided log file descriptor when processing the VHOST_SET_LOG_FD ioctl command. The file descriptor was never released and continued to consume kernel memory. A privileged local user with access to the /dev/vhost-net files could use this flaw to create a denial-of-service attack.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-09-01 11:45:05 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:	1251871
Bug Blocks:	1250300

Description Wade Mealing 2015-08-10 06:24:19 UTC

A flaw was found in the way the Linux kernel's vhost driver treated userspace provided log file descriptor when processing the VHOST_SET_LOG_FD ioctl command. The file descriptor was never released and continued to consume kernel memory. A privileged local user with access to the /dev/vhost-net files could use this flaw to create a denial-of-service attack.

Upstream patch:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7932c0bd7740f4cd2aa168d3ce0199e7af7d72d5

Comment 1 Wade Mealing 2015-08-10 08:04:44 UTC

Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1251871]

Comment 2 Wade Mealing 2015-08-18 04:58:46 UTC

Acknowledgements:

Red Hat would like to thank Michael S. Tsirkin of Red Hat Engineering for reporting this issue responsibly.

Comment 3 Wade Mealing 2015-08-18 05:03:55 UTC

Statement:

This issue does not affect the Linux kernels as shipped with Red Hat Enterprise Linux 5.

This issue has been rated as having Low impact, affects the Linux kernels as shipped with Red Hat Enterprise Linux 6, 7 and Red Hat Enterprise MRG 2 and is currently not planned to be addressed in a future updates.