Bug 851172 (CVE-2012-3496)

Summary:	CVE-2012-3496 kernel: xen: XENMEM_populate_physmap DoS vulnerability
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	drjones, lersek, pbonzini, security-response-team, tburke
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:	2019-06-10 10:59:11 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:	854590
Bug Blocks:	851204

Description Petr Matousek 2012-08-23 12:09:16 UTC

XENMEM_populate_physmap can be called with invalid flags.  By calling it with MEMF_populate_on_demand flag set, a BUG can be triggered if a translating paging mode is not being used.

A malicious guest kernel can crash the host.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Matthew Daley as the original reporter.

Comment 3 Petr Matousek 2012-08-23 12:10:47 UTC

Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5.

This issue did not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.

Comment 4 Petr Matousek 2012-09-05 11:46:39 UTC

Now public via:

http://seclists.org/oss-sec/2012/q3/378

Comment 5 Petr Matousek 2012-09-05 11:47:45 UTC

Created xen tracking bugs for this issue

Affects: fedora-all [bug 854590]

Comment 6 Fedora Update System 2012-09-17 18:00:06 UTC

xen-4.1.3-2.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.