Bug 870086 - (CVE-2012-4535) CVE-2012-4535 kernel: xen: VCPU timer overflow leads to PCPU deadlock and host death-by-watchdog
CVE-2012-4535 kernel: xen: VCPU timer overflow leads to PCPU deadlock and hos...
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: 870150 870151 876198
Blocks: 870154
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Reported: 2012-10-25 10:30 EDT by Petr Matousek
Modified: 2015-02-16 10:39 EST (History)
16 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-04-15 10:30:37 EDT
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Description Petr Matousek 2012-10-25 10:30:13 EDT
A guest which sets a VCPU with an inappropriate deadline can cause an infinite loop in Xen, blocking the affected physical CPU indefinitely.

A malicious guest administrator can trigger the bug. If the Xen watchdog is enabled, the whole system will crash. Otherwise the guest can cause the system to become completely unresponsive.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 3 Petr Matousek 2012-10-25 12:19:12 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 5 Petr Matousek 2012-11-13 09:36:36 EST
Created xen tracking bugs for this issue

Affects: fedora-all [bug 876198]
Comment 6 Fedora Update System 2012-11-22 21:55:09 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 7 Fedora Update System 2012-11-22 21:58:51 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 8 Fedora Update System 2012-11-23 02:20:28 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 9 errata-xmlrpc 2012-12-04 15:53:35 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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