|Bugzilla:||681578: CVE-2011-1083 kernel: excessive in kernel CPU consumption when creating large nested epoll structures|
The MITRE CVE dictionary describes this issue as:
The epoll implementation in the Linux kernel 18.104.22.168 and earlier does not properly traverse a tree of epoll file descriptors, which allows local users to cause a denial of service (CPU consumption) via a crafted application that makes epoll_create and epoll_ctl system calls.
This issue affected the versions of Linux kernel as shipped with Red Hat Enterprise Linux 4, 5, 6, and Red Hat Enterprise MRG. It was addressed in Red Hat Enterprise Linux 5 and 6 via RHSA-2012:0150 and RHSA-2012:0862 respectively. There is no plan to address this flaw in Red Hat Enterprise Linux 4. Future updates may address this issue in Red Hat Enterprise MRG.
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Red Hat security errata
|MRG Grid for RHEL 6 Server v.2 (kernel-rt)||RHBA-2012:0496||April 18, 2012|
|Red Hat Enterprise Linux Server EUS (v. 6.2) (kernel)||RHSA-2012:1129||July 31, 2012|
|Red Hat Enterprise Linux version 5 (kernel)||RHSA-2012:0150||February 21, 2012|
|Red Hat Enterprise Linux version 6 (kernel)||RHSA-2012:0862||June 19, 2012|
Red Hat would like to thank Nelson Elhage for reporting this issue.
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For clarification or corrections please contact the Red Hat Security Response Team.