Bug 870101 - (CVE-2012-4537) CVE-2012-4537 kernel: xen: Memory mapping failure can crash Xen
CVE-2012-4537 kernel: xen: Memory mapping failure can crash Xen
Status: CLOSED ERRATA
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
unspecified
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
impact=moderate,public=20121113,repor...
: Security
Depends On: 870148 870149 876203
Blocks: 870154
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Reported: 2012-10-25 10:41 EDT by Petr Matousek
Modified: 2015-02-16 10:51 EST (History)
16 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-04-15 10:28:10 EDT
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Description Petr Matousek 2012-10-25 10:41:40 EDT
When set_p2m_entry fails, Xen's internal data structures (the p2m and m2p tables) can get out of sync. This failure can be triggered by unusual guest behaviour exhausting the memory reserved for the p2m table. If it happens, subsequent guest-invoked memory operations can cause Xen to fail an assertion and crash.

A malicious HVM guest administrator might be able to cause Xen to crash.


Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 3 Petr Matousek 2012-10-25 12:19:06 EDT
Statement:

This issue did 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 12 Petr Matousek 2012-11-13 09:45:59 EST
Created xen tracking bugs for this issue

Affects: fedora-all [bug 876203]
Comment 13 Fedora Update System 2012-11-22 21:55:26 EST
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 14 Fedora Update System 2012-11-22 21:59:06 EST
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 15 Fedora Update System 2012-11-23 02:20:37 EST
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.
Comment 16 errata-xmlrpc 2012-12-04 15:53:40 EST
This issue has been addressed in following products:

  Red Hat Enterprise Linux 5

Via RHSA-2012:1540 https://rhn.redhat.com/errata/RHSA-2012-1540.html

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