Bug 1404284 (CVE-2015-8967)

Summary:	CVE-2015-8967 kernel: arm64: Strict page permission bypass
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
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, aquini, arm-mgr, bhu, dhoward, esammons, fhrbata, gansalmon, iboverma, ichavero, itamar, jforbes, jkacur, jkastner, joelsmith, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, mguzik, nmurray, pholasek, plougher, rt-maint, rvrbovsk, slawomir, vdronov, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A flaw in 'arch/arm64/kernel/sys.c' in the Linux kernel allows local users to bypass the 'strict page permissions' protection mechanism and modify the system-call table and, consequently, gain privileges by leveraging write access.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-12-21 10:31:11 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:	1404286

Description Andrej Nemec 2016-12-13 14:25:04 UTC

The flaw in the code in 'arch/arm64/kernel/sys.c' in the Linux kernel allows local users to bypass the "strict page permissions" protection mechanism and modify the system-call table, and consequently gain privileges, by leveraging write access.

Upstream fix:

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c623b33b4e9599c6ac5076f7db7369eb9869aa04

References:

http://source.android.com/security/bulletin/2016-12-01.html

https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2015-8967

Comment 3 Vladis Dronov 2016-12-21 10:31:11 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 as code with the flaw is not present in the products listed.

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG-2 as code with the flaw is not built and shipped in the products listed.