Bug 851172 (CVE-2012-3496) - CVE-2012-3496 kernel: xen: XENMEM_populate_physmap DoS vulnerability
Summary: CVE-2012-3496 kernel: xen: XENMEM_populate_physmap DoS vulnerability
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2012-3496
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: 854590
Blocks: 851204
TreeView+ depends on / blocked
 
Reported: 2012-08-23 12:09 UTC by Petr Matousek
Modified: 2023-05-11 20:27 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2019-06-10 10:59:11 UTC
Embargoed:

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Description Petr Matousek 2012-08-23 12:09:16 UTC 
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 12:10:47 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 2012-09-05 11:46:39 UTC 
Now public via:

http://seclists.org/oss-sec/2012/q3/378
Comment 5 Petr Matousek 2012-09-05 11:47:45 UTC 
Created xen tracking bugs for this issue

Affects: fedora-all [bug 854590]
Comment 6 Fedora Update System 2012-09-17 18:00:06 UTC 
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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