Bug 851172 - (CVE-2012-3496) CVE-2012-3496 kernel: xen: XENMEM_populate_physmap DoS vulnerability
CVE-2012-3496 kernel: xen: XENMEM_populate_physmap DoS vulnerability
Status: NEW
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=20120905,repor...
: Security
Depends On: 854590
Blocks: 851204
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Reported: 2012-08-23 08:09 EDT by Petr Matousek
Modified: 2015-11-06 11:33 EST (History)
5 users (show)

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RHEL 7.3 requirements from Atomic Host:


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Description Petr Matousek 2012-08-23 08:09:16 EDT
XENMEM_populate_physmap can be called with invalid flags.  By calling it with MEMF_populate_on_demand flag set, a BUG can be triggered if a translating paging mode is not being used.

A malicious guest kernel can crash the host.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue. Upstream acknowledges Matthew Daley as the original reporter.
Comment 3 Petr Matousek 2012-08-23 08:10:47 EDT
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 2012-09-05 07:46:39 EDT
Now public via:

http://seclists.org/oss-sec/2012/q3/378
Comment 5 Petr Matousek 2012-09-05 07:47:45 EDT
Created xen tracking bugs for this issue

Affects: fedora-all [bug 854590]
Comment 6 Fedora Update System 2012-09-17 14:00:06 EDT
xen-4.1.3-2.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

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