Bug 1492984 (CVE-2017-12168)

Summary:	CVE-2017-12168 Kernel: kvm: ARM64: assert failure when accessing PMCCNTR register
Product:	[Other] Security Response	Reporter:	Prasad Pandit <ppandit>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, airlied, ajax, aquini, bhu, blc, bskeggs, dhoward, eparis, esammons, esandeen, fhrbata, hdegoede, hkrzesin, hwkernel-mgr, iboverma, ichavero, itamar, jarodwilson, jforbes, jglisse, jkacur, jonathan, josef, jross, jwboyer, kernel-maint, kernel-mgr, labbott, lgoncalv, linville, lwang, matt, mchehab, mcressma, mguzik, mjg59, mlangsdo, nhorman, nmurray, plougher, quintela, rt-maint, rvrbovsk, steved, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	An assertion failure issue was found in the Linux kernel's KVM hypervisor module built to support visualization on ARM64 architecture platforms. The failure could occur while accessing Performance Monitors Cycle Count Register (PMCCNTR) from a guest. A privileged guest user could use this flaw to crash the host kernel resulting in denial of service.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2017-11-09 15:10:33 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:	1403106
Bug Blocks:	1403799

Description Prasad Pandit 2017-09-19 05:49:17 UTC

Linux kernel built for the ARM64(CONFIG_ARM64) architecture platform with
KVM virtualisation(CONFIG_KVM) support is vulnerable to an assert failure
issue. It could occur while accessing Performance Monitors Cycle Count
Register(PMCCNTR).

A privileged guest user/process could use this flaw to crash the host
kernel resulting in DoS.

Upstream patch:
---------------
  -> https://git.kernel.org/linus/9e3f7a29694049edd728e2400ab57ad7553e5aa9

Comment 4 Eric Christensen 2017-09-19 14:51:48 UTC

Statement:

This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6, 7 and Red Hat Enterprise MRG 2.