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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED ERRATA QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: 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:
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.