Bug 984722 (CVE-2013-4127)

Summary:	CVE-2013-4127 kernel: vhost-net: use-after-free in vhost_net_flush
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, anton, bhu, davej, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jkurik, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, matt, mcressma, npajkovs, plougher, rt-maint, rvrbovsk, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-07-15 19:55:38 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:	980643, 984723
Bug Blocks:	984728

Description Petr Matousek 2013-07-15 19:52:19 UTC

vhost_net_ubuf_put_and_wait has a confusing name: it will actually also free it's argument. vhost_net_flush tries to use the argument after passing it to vhost_net_ubuf_put_and_wait, this results in use after free.

Upstream fix:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=dd7633ecd553a5e304d349aa6f8eb8a0417098c5

Introduced by:
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=1280c27f8e29acf4af2da914e80ec27c3dbd5c01

Introduced in upstream version:
v3.8-rc1

References:
https://bugzilla.redhat.com/show_bug.cgi?id=980643
http://pkgs.fedoraproject.org/cgit/kernel.git/commit/?h=f19&id=da4ebd83da1869778909f394f6ebd50850ef5fec

Comment 1 Petr Matousek 2013-07-15 19:55:38 UTC

Statement:

Not vulnerable.

This issue did not affect the kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.