Public Date:
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 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.

Find out more about CVE-2011-1083 from the MITRE CVE dictionary dictionary and NIST NVD.


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.

CVSS v2 metrics

NOTE: The following CVSS v2 metrics and score provided are preliminary and subject to review.

Base Score 4.9
Base Metrics AV:L/AC:L/Au:N/C:N/I:N/A:C
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete

Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).

Red Hat Security Errata

Platform Errata Release Date
Red Hat Enterprise Linux Server EUS (v. 6.2) (kernel) RHSA-2012:1129 2012-07-31
Red Hat Enterprise Linux version 5 (kernel) RHSA-2012:0150 2012-02-21
MRG Grid for RHEL 6 Server v.2 (kernel-rt) RHBA-2012:0496 2012-04-18
Red Hat Enterprise Linux version 6 (kernel) RHSA-2012:0862 2012-06-19

Affected Packages State

Platform Package State
Red Hat Enterprise Linux 4 kernel Will not fix


Red Hat would like to thank Nelson Elhage for reporting this issue.