Bug 886959 (CVE-2012-5634) - CVE-2012-5634 kernel: xen: VT-d interrupt remapping source validation flaw
Summary: CVE-2012-5634 kernel: xen: VT-d interrupt remapping source validation flaw
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2012-5634
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: 893568
Blocks: 886962
TreeView+ depends on / blocked
 
Reported: 2012-12-13 16:52 UTC by Petr Matousek
Modified: 2019-09-29 12:58 UTC (History)
5 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2013-08-24 13:50:09 UTC


Attachments (Terms of Use)

Description Petr Matousek 2012-12-13 16:52:02 UTC
When passing a device which is behind a legacy PCI Bridge through to
a guest Xen incorrectly configures the VT-d hardware. This could allow
incorrect interrupts to be injected to other guests which also have
passthrough devices.

In a typical Xen system many devices are owned by domain 0 or driver
domains, leaving them vulnerable to such an attack. Such a DoS is
likely to have an impact on other guests running in the system.

On systems using Intel VT-d for PCI passthrough a malicious domain,
given access to a device which is behind a legacy PCI bridge, can
mount a denial of service attack affecting the whole system.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.

Comment 3 Petr Matousek 2012-12-13 16:57:01 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 2013-01-09 13:25:04 UTC
Created xen tracking bugs for this issue

Affects: fedora-all [bug 893568]

Comment 5 Fedora Update System 2013-01-23 01:28:48 UTC
xen-4.1.4-2.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2013-01-23 02:05:31 UTC
xen-4.2.1-3.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2013-02-02 04:28:40 UTC
xen-4.1.4-3.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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