Bug 1124350 (CVE-2014-5146, CVE-2014-5149) - CVE-2014-5146 CVE-2014-5149 xen: Long latency virtual-mmu operations are not preemptible (xsa-97)
Summary: CVE-2014-5146 CVE-2014-5149 xen: Long latency virtual-mmu operations are not ...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2014-5146, CVE-2014-5149
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: impact=moderate,public=20140812,repor...
Depends On:
Blocks: 1124353
TreeView+ depends on / blocked
 
Reported: 2014-07-29 09:56 UTC by Petr Matousek
Modified: 2019-06-08 20:07 UTC (History)
3 users (show)

Fixed In Version:
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2014-07-29 12:55:11 UTC


Attachments (Terms of Use)

Description Petr Matousek 2014-07-29 09:56:33 UTC
Some MMU virtualization operations on HVM guests must process every
page assigned to a guest.  For larger guests, this can tie up a vcpu
for a significant amount of time, as the operations are not
preemptible.

A malicious HVM guest with a large allocation of shadow/p2m RAM
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 2 Petr Matousek 2014-07-29 09:57:19 UTC
Statement:

Not vulnerable.

This issue does not affect the versions of the kernel-xen package as shipped
with Red Hat Enterprise Linux 5.


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