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Fencer Vulns
low 2.1

CVE-2004-0491 json

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 t…

published 2004-12-31 21 y ago modified 2026-06-16 4 mo ago also EUVD-2004-0490

cvss
2.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

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.

Patch / fix

  • kernel RHEL 3 2.4.21-32.0.1.EL
  • kernel-smp RHEL 3 2.4.21-32.0.1.EL
  • kernel-BOOT RHEL 3 2.4.21-32.0.1.EL
  • kernel-source RHEL 3 2.4.21-32.0.1.EL
  • kernel-hugemem RHEL 3 2.4.21-32.0.1.EL
  • kernel-unsupported RHEL 3 2.4.21-32.0.1.EL
  • kernel-smp-unsupported RHEL 3 2.4.21-32.0.1.EL
  • kernel-hugemem-unsupported RHEL 3 2.4.21-32.0.1.EL

red hat advisories RHSA-2005:472

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2004-0491 updated

security flaw

  • Red Hat Desktop version 3 kernel 2.4.21-32.0.1.EL, kernel-smp 2.4.21-32.0.1.EL, kernel-BOOT 2.4.21-32.0.1.EL, kernel-source 2.4.21-32.0.1.EL, kernel-hugemem 2.4.21-32.0.1.EL, kernel-unsupported 2.4.21-32.0.1.EL, +2 more Red Hat Enterprise Linux AS version 3 kernel 2.4.21-32.0.1.EL, kernel-smp 2.4.21-32.0.1.EL, kernel-BOOT 2.4.21-32.0.1.EL, kernel-source 2.4.21-32.0.1.EL, kernel-hugemem 2.4.21-32.0.1.EL, kernel-unsupported 2.4.21-32.0.1.EL, +2 more Red Hat Enterprise Linux ES version 3 kernel 2.4.21-32.0.1.EL, kernel-smp 2.4.21-32.0.1.EL, kernel-BOOT 2.4.21-32.0.1.EL, kernel-source 2.4.21-32.0.1.EL, kernel-hugemem 2.4.21-32.0.1.EL, kernel-unsupported 2.4.21-32.0.1.EL, +2 more Red Hat Enterprise Linux WS version 3 kernel 2.4.21-32.0.1.EL, kernel-smp 2.4.21-32.0.1.EL, kernel-BOOT 2.4.21-32.0.1.EL, kernel-source 2.4.21-32.0.1.EL, kernel-hugemem 2.4.21-32.0.1.EL, kernel-unsupported 2.4.21-32.0.1.EL, +2 more
    fixed: vendor fix RHSA-2005:472

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 2.1 AV:L/AC:L/Au:N/C:N/I:P/A:N

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.