Bug 1124350 – CVE-2014-5146 CVE-2014-5149 xen: Long latency virtual-mmu operations are not preemptible (xsa-97)

Bugzilla will be upgraded to version 5.0 on a still to be determined date in the near future. The original upgrade date has been delayed.

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 ...

Status:	CLOSED NOTABUG

Aliases:	CVE-2014-5146, CVE-2014-5149

Product:	Security Response
Classification:	Other
Component:	vulnerability (Show other bugs)
Sub Component:
Version:	unspecified
Hardware:	All Linux

Priority	medium Severity medium
Target Milestone:	---
Target Release:	---
Assigned To:	Red Hat Product Security
QA Contact:
Docs Contact:

URL:
Whiteboard:	impact=moderate,public=20140812,repor...
Keywords:	Security

Depends On:
Blocks:	1124353
	Show dependency tree / graph

Reported:	2014-07-29 05:56 EDT by Petr Matousek
Modified:	2014-08-12 11:47 EDT (History)
CC List:	3 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2014-07-29 08:55:11 EDT
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

Groups: None (edit)

Description Petr Matousek 2014-07-29 05:56:33 EDT

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 05:57:19 EDT

Statement:

Not vulnerable.

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

Note You need to log in before you can comment on or make changes to this bug.