How severe is CVE-2011-2491?

CVE-2011-2491 has a CVSS 2.0 base score of 4.9, rated medium severity.

Is CVE-2011-2491 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2491?

CVE-2011-2491 primarily affects Redhat Enterprise Linux Desktop. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-2491?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-2491 published?

CVE-2011-2491 was published on 2013-03-01 and last updated on 2026-06-16.

CVE-2011-2491

CVE-2011-2491 is a medium-severity vulnerability in Redhat Enterprise Linux Desktop with a CVSS 2.0 base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-400.

Key facts

Severity: Medium (CVSS 2.0 base score 4.9)
EPSS exploit prediction: 0% (32nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-400
Affected product: Redhat Enterprise Linux Desktop
Published: 2013-03-01
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2011-2491?: 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.
How severe is CVE-2011-2491?: CVE-2011-2491 has a CVSS 2.0 base score of 4.9, rated medium severity.
Is CVE-2011-2491 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (32nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2491?: CVE-2011-2491 primarily affects Redhat Enterprise Linux Desktop. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-2491?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-2491 published?: CVE-2011-2491 was published on 2013-03-01 and last updated on 2026-06-16.

References

Affected products (4)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:*

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