Bug 870086 (CVE-2012-4535) - CVE-2012-4535 kernel: xen: VCPU timer overflow leads to PCPU deadlock and host death-by-watchdog
Summary: CVE-2012-4535 kernel: xen: VCPU timer overflow leads to PCPU deadlock and hos...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2012-4535
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 870150 870151 876198
Blocks: 870154
TreeView+ depends on / blocked
 
Reported: 2012-10-25 14:30 UTC by Petr Matousek
Modified: 2023-05-11 20:20 UTC (History)
16 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-04-15 14:30:37 UTC
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2012:1540 0 normal SHIPPED_LIVE Important: kernel security, bug fix, and enhancement update 2012-12-05 01:51:24 UTC

Description Petr Matousek 2012-10-25 14:30:13 UTC 
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 16:19:12 UTC 
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 14:36:36 UTC 
Created xen tracking bugs for this issue

Affects: fedora-all [bug 876198]
Comment 6 Fedora Update System 2012-11-23 02:55:09 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 7 Fedora Update System 2012-11-23 02:58:51 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 8 Fedora Update System 2012-11-23 07:20:28 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.
Comment 9 errata-xmlrpc 2012-12-04 20:53:35 UTC 
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
Note You need to log in before you can comment on or make changes to this bug.