CVE-2011-1083
First published: Wed Mar 02 2011(Updated: )
Description of problem: The epoll subsystem allows users to create large nested epoll structures, which the kernel will then to walk with preemption disabled, causing a denial of service via excessive CPU consumption in the kernel. References: <a href="http://thread.gmane.org/gmane.linux.kernel/1105744">http://thread.gmane.org/gmane.linux.kernel/1105744</a> <a href="http://thread.gmane.org/gmane.linux.kernel/1105744/focus=1105888">http://thread.gmane.org/gmane.linux.kernel/1105744/focus=1105888</a> <a href="http://seclists.org/oss-sec/2011/q1/337">http://seclists.org/oss-sec/2011/q1/337</a> Acknowledgements: Red Hat would like to thank Nelson Elhage for reporting this issue.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | <=2.6.37.2 | |
| SUSE Linux Enterprise Server | =11-sp1 | |
| SUSE Linux Enterprise Desktop | =11-sp1 | |
| SUSE Linux Enterprise Desktop | =11-sp2 | |
| SUSE Linux Enterprise Server | =11-sp2 | |
| SUSE Linux Enterprise Server | =11-sp2 | |
| SUSE Linux Enterprise Server | =11-sp1 | |
| Red Hat Enterprise Linux Desktop | =6.0 | |
| Red Hat Enterprise Linux Server | =6.0 | |
| Red Hat Enterprise Linux Workstation | =6.0 |
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Reference Links
- http://thread.gmane.org/gmane.linux.kernel/1105744
- http://thread.gmane.org/gmane.linux.kernel/1105744/focus=1105888
- http://seclists.org/oss-sec/2011/q1/337
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=748668
- https://rhn.redhat.com/errata/RHSA-2012-0150.html
- http://dovecot.org/list/dovecot/2012-February/064004.html
- http://www.ksplice.com/uptrack/notification-options
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=569503&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=569503&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=570690&action=diff
- https://bugzilla.redhat.com/show_bug.cgi/attachment.cgi?id=570690&action=edit
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=681578#c31
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=681578#c33
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=681578#c25
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=804778
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=807860
- http://bugs.centos.org/view.php?id=5634
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=681578#c44
- https://rhn.redhat.com/errata/RHSA-2012-0862.html
- https://rhn.redhat.com/errata/RHSA-2012-1129.html
- https://bugzilla.redhat.com/show_bug.cgi?id=681578
- http://article.gmane.org/gmane.linux.kernel/1105744
- http://openwall.com/lists/oss-security/2011/03/02/2
- http://article.gmane.org/gmane.linux.kernel/1106686
- http://openwall.com/lists/oss-security/2011/03/02/1
- http://secunia.com/advisories/43522
- http://www.osvdb.org/71265
- http://article.gmane.org/gmane.linux.kernel/1105888
- http://rhn.redhat.com/errata/RHSA-2012-0862.html
- http://secunia.com/advisories/48898
- http://secunia.com/advisories/48964
- http://lists.opensuse.org/opensuse-security-announce/2012-05/msg00013.html
- http://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html
- http://secunia.com/advisories/48410
- http://secunia.com/advisories/48115
Frequently Asked Questions
What is the severity of CVE-2011-1083?
CVE-2011-1083 is classified as a denial-of-service vulnerability due to excessive CPU consumption.
How do I fix CVE-2011-1083?
To mitigate CVE-2011-1083, users should update their Linux kernel to a version newer than 2.6.37.2.
Which versions of the Linux kernel are affected by CVE-2011-1083?
CVE-2011-1083 affects Linux kernel versions up to and including 2.6.37.2.
Can CVE-2011-1083 be exploited remotely?
CVE-2011-1083 can potentially be exploited locally as it requires the ability to create nested epoll structures.
What platforms are affected by CVE-2011-1083?
CVE-2011-1083 impacts various distributions including SUSE Linux Enterprise Desktop and Server, as well as Red Hat Enterprise Linux.
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