Vulnerabilities
Misconfiguration
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CVE Vulnerabilities

CVE-2011-2491

Uncontrolled Resource Consumption

Published: Mar 01, 2013 | Modified: Apr 11, 2025
CVSS 3.x
N/A
Source:
NVD
CVSS 2.x
4.9 MEDIUM
AV:L/AC:L/Au:N/C:N/I:N/A:C
RedHat/V2
4.9 IMPORTANT
AV:L/AC:L/Au:N/C:N/I:N/A:C
RedHat/V3
Ubuntu
MEDIUM
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Additional information
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2011-2491
CWEhttps://cwe.mitre.org/data/definitions/400.html

The Network Lock Manager (NLM) protocol implementation in the NFS client functionality in the Linux kernel before 3.0 allows local users to cause a denial of service (system hang) via a LOCK_UN flock system call.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

NameVendorStart VersionEnd Version
Linux_kernelLinux*3.0 (excluding)
Red Hat Enterprise Linux 5RedHatkernel-0:2.6.18-274.3.1.el5*
Red Hat Enterprise Linux 5.6 EUS - Server OnlyRedHatkernel-0:2.6.18-238.31.1.el5*
Red Hat Enterprise Linux 6RedHatkernel-0:2.6.32-131.12.1.el6*
Red Hat Enterprise MRG 2RedHatkernel-rt-0:2.6.33.9-rt31.75.el6rt*
LinuxUbuntuhardy*
LinuxUbuntulucid*
LinuxUbuntumaverick*
LinuxUbuntunatty*
LinuxUbuntuupstream*
Linux-armadaxpUbuntuupstream*
Linux-ec2Ubuntulucid*
Linux-ec2Ubuntumaverick*
Linux-ec2Ubuntuupstream*
Linux-floUbuntuupstream*
Linux-fsl-imx51Ubuntulucid*
Linux-fsl-imx51Ubuntuupstream*
Linux-goldfishUbuntusaucy*
Linux-goldfishUbuntuupstream*
Linux-grouperUbuntusaucy*
Linux-grouperUbuntuupstream*
Linux-lts-backport-maverickUbuntulucid*
Linux-lts-backport-maverickUbuntuupstream*
Linux-lts-backport-nattyUbuntulucid*
Linux-lts-backport-nattyUbuntuupstream*
Linux-lts-backport-oneiricUbuntuupstream*
Linux-lts-quantalUbuntuupstream*
Linux-lts-raringUbuntuupstream*
Linux-lts-saucyUbuntuupstream*
Linux-lts-trustyUbuntuupstream*
Linux-lts-utopicUbuntuupstream*
Linux-lts-vividUbuntuupstream*
Linux-maguroUbuntusaucy*
Linux-maguroUbuntuupstream*
Linux-makoUbuntusaucy*
Linux-makoUbuntuupstream*
Linux-mantaUbuntusaucy*
Linux-mantaUbuntuupstream*
Linux-mvl-doveUbuntulucid*
Linux-mvl-doveUbuntumaverick*
Linux-mvl-doveUbuntuupstream*
Linux-raspi2Ubuntuupstream*
Linux-raspi2Ubuntuvivid/ubuntu-core*
Linux-ti-omap4Ubuntumaverick*
Linux-ti-omap4Ubuntunatty*
Linux-ti-omap4Ubuntuupstream*

Potential Mitigations

  • Mitigation of resource exhaustion attacks requires that the target system either:

  • The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.

  • The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

References

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