Bug 950686 - (CVE-2013-1919) CVE-2013-1919 kernel: xen: Several access permission issues with IRQs for unprivileged guests
CVE-2013-1919 kernel: xen: Several access permission issues with IRQs for unp...
Status: CLOSED NOTABUG
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=20130418,repor...
: Security
Depends On: 953568
Blocks: 950673
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Reported: 2013-04-10 12:34 EDT by Petr Matousek
Modified: 2013-05-13 04:01 EDT (History)
5 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-05-13 04:01:36 EDT
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Description Petr Matousek 2013-04-10 12:34:03 EDT
Various IRQ related access control operations may not have the intended effect, thus potentially permitting a stub domain to gran its client domain access to an IRQ it doesn't have access to itself.

Malicious or buggy stub domains kernels can mount a denial of service attack possibly affecting the whole system.

Only Xen systems using stub domains are vulnerable.

Only HVM guests with passed-through IRQs or PCI devices are able to exploit the vulnerability.

Acknowledgements:

Red Hat would like to thank the Xen for reporting this issue.
Comment 1 Petr Matousek 2013-04-10 12:36:24 EDT
Statement:

Not vulnerable.

This issue did not affect the versions of the kernel-xen package as shipped with Red Hat Enterprise Linux 5 as it has no support for stub domains.

This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.
Comment 7 Petr Matousek 2013-04-18 09:43:23 EDT
Created xen tracking bugs for this issue

Affects: fedora-all [bug 953568]
Comment 8 Fedora Update System 2013-05-04 22:25:03 EDT
xen-4.1.5-1.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 9 Fedora Update System 2013-05-04 22:25:39 EDT
xen-4.2.2-1.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

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