Bug 1420236 (CVE-2016-10044)

Summary:	CVE-2016-10044 kernel: aio_mount function does not properly restrict execute access
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED WONTFIX	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, aquini, bhu, dhoward, esammons, fhrbata, gansalmon, hwkernel-mgr, iboverma, ichavero, itamar, jforbes, jkacur, jkastner, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, slawomir, 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:	The aio_mount function in fs/aio.c in the Linux kernel does not properly restrict execute access, which makes it easier for local users to bypass intended SELinux W^X policy restrictions.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-05-22 04:41:17 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:	1431924, 1431925, 1431926, 1431927, 1431928
Bug Blocks:	1420237

Description Andrej Nemec 2017-02-08 09:35:09 UTC

The aio_mount function in fs/aio.c in the Linux kernel does not properly restrict execute access, which makes it easier for local users to bypass intended SELinux W^X policy restrictions, and consequently gain privileges, via an io_setup system call.

Upstream patch:

https://github.com/torvalds/linux/commit/22f6b4d34fcf039c63a94e7670e0da24f8575a5a

References:

https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.7.7
https://en.wikipedia.org/wiki/W%5EX