How severe is CVE-2004-0491?

CVE-2004-0491 has a CVSS 2.0 base score of 2.1, rated low severity.

Is CVE-2004-0491 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2004-0491?

CVE-2004-0491 affects Redhat Enterprise Linux. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2004-0491?

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

When was CVE-2004-0491 published?

CVE-2004-0491 was published on 2004-12-31 and last updated on 2026-06-16.

CVE-2004-0491

CVE-2004-0491 is a low-severity vulnerability in Redhat Enterprise Linux with a CVSS 2.0 base score of 2.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Low (CVSS 2.0 base score 2.1)
EPSS exploit prediction: 0% (28th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Redhat Enterprise Linux
Published: 2004-12-31
Last modified: 2026-06-16

Description

The linux-2.4.21-mlock.patch in Red Hat Enterprise Linux 3 does not properly maintain the mlock page count when one process unlocks pages that belong to another process, which allows local users to mlock more memory than specified by the rlimit.

Frequently asked questions

What is CVE-2004-0491?: The linux-2.4.21-mlock.patch in Red Hat Enterprise Linux 3 does not properly maintain the mlock page count when one process unlocks pages that belong to another process, which allows local users to mlock more memory than specified by the rlimit.
How severe is CVE-2004-0491?: CVE-2004-0491 has a CVSS 2.0 base score of 2.1, rated low severity.
Is CVE-2004-0491 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (28th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2004-0491?: CVE-2004-0491 affects Redhat Enterprise Linux. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2004-0491?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2004-0491 published?: CVE-2004-0491 was published on 2004-12-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:o:redhat:enterprise_linux:3.0:*:*:*:*:*:*:*

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