Bug 870106 (CVE-2012-4538)

Summary:	CVE-2012-4538 kernel: xen: Unhooking empty PAE entries can crash Xen
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	drjones, imammedo, 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:	2013-04-15 14:23:39 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:	876205
Bug Blocks:	870154

Description Petr Matousek 2012-10-25 14:48:22 UTC

The HVMOP_pagetable_dying hypercall does not correctly check the caller's pagetable state, leading to a hypervisor crash.

An HVM guest running on shadow pagetables (that is, not HAP) can cause the hypervisor to crash.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.

Comment 2 Paolo Bonzini 2012-10-25 15:00:52 UTC

RHEL5 is not affected.

Comment 3 Petr Matousek 2012-10-25 16:18:38 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 2012-11-13 14:48:06 UTC

Created xen tracking bugs for this issue

Affects: fedora-all [bug 876205]

Comment 5 Fedora Update System 2012-11-23 02:55:36 UTC

xen-4.1.3-4.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2012-11-23 02:59:15 UTC

xen-4.1.3-6.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2012-11-23 07:20:47 UTC

xen-4.2.0-4.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.