Bug 769711 – CVE-2011-4621 kernel: tight loop and no preemption can cause system stall

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Bug 769711 - (CVE-2011-4621) CVE-2011-4621 kernel: tight loop and no preemption can cause system stall

Summary:	CVE-2011-4621 kernel: tight loop and no preemption can cause system stall

Status:	CLOSED ERRATA

Aliases:	CVE-2011-4621

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=20101121,repor...
Keywords:	Security

Depends On:	749785 769715 812183
Blocks:	767920
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Reported:	2011-12-21 15:29 EST by Petr Matousek
Modified:	2016-11-08 11:00 EST (History)
CC List:	7 users (show)

See Also:
Fixed In Version:
Doc Type:	Bug Fix
Doc Text:
Story Points:	---
Clone Of:
Environment:
Last Closed:	2013-08-24 08:48:31 EDT
Type:	---
Regression:	---
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oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
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Description Petr Matousek 2011-12-21 15:29:32 EST

A tight loop in user level process isn't preempted unless a realtime process is woken up on the cpu.  Some important kernel threads such as events/*, kblockd/* can be blocked by the process, and the machine stalls.

Unprivileged local user could use this flaw to DoS the system.

Upstream commit:
http://git.kernel.org/linus/f26f9aff6aaf67e9a430d16c266f91b13a5bff64

Reference:
https://lkml.org/lkml/2010/11/20/212

Acknowledgements:

Red Hat would like to thank Masaki Tachibana for reporting this issue.

Comment 2 Kurt Seifried 2011-12-21 17:23:00 EST

Added CVE-2011-4621 as per http://www.openwall.com/lists/oss-security/2011/12/21/6

Comment 3 Eugene Teo (Security Response) 2012-04-12 21:40:31 EDT

Created kernel tracking bugs for this issue

Affects: fedora-all [bug 812183]

Comment 6 Petr Matousek 2013-08-24 08:48:31 EDT

Statement:

This issue does not affect Red Hat Enterprise Linux 5 and Red Hat Enterprise MRG 2.

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