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Fencer Vulns
high 7.2

CVE-2003-0985 json

The mremap system call (do_mremap) in Linux kernel 2.4.x before 2.4.21, and possibly other versions before 2.4.24, does not properly perfor…

published 2004-01-20 22 y ago modified 2026-06-16 4 mo ago also EUVD-2003-0975

cvss
7.2
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.2%
EPSS 1.2% chance of exploitation in 30 days, percentile 69%
public exploits
3
Exploit-DB

Summary

The mremap system call (do_mremap) in Linux kernel 2.4.x before 2.4.21, and possibly other versions before 2.4.24, does not properly perform bounds checks, which allows local users to cause a denial of service and possibly gain privileges by causing a remapping of a virtual memory area (VMA) to create a zero length VMA, a different vulnerability than CAN-2004-0077.

Patch / fix

  • kernel RHEL 3 2.4.21-4.0.2.EL
  • kernel-smp RHEL 3 2.4.21-4.0.2.EL
  • kernel-BOOT RHEL 3 2.4.21-4.0.2.EL
  • kernel-source RHEL 3 2.4.21-4.0.2.EL
  • kernel-hugemem RHEL 3 2.4.21-4.0.2.EL
  • kernel-unsupported RHEL 3 2.4.21-4.0.2.EL
  • kernel-smp-unsupported RHEL 3 2.4.21-4.0.2.EL
  • kernel-hugemem-unsupported RHEL 3 2.4.21-4.0.2.EL

red hat advisories RHSA-2003:416

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-2003-0985 updated

security flaw

  • Red Hat Desktop version 3 kernel 2.4.21-4.0.2.EL, kernel-smp 2.4.21-4.0.2.EL, kernel-BOOT 2.4.21-4.0.2.EL, kernel-source 2.4.21-4.0.2.EL, kernel-hugemem 2.4.21-4.0.2.EL, kernel-unsupported 2.4.21-4.0.2.EL, +2 more Red Hat Enterprise Linux AS version 3 kernel 2.4.21-4.0.2.EL, kernel-smp 2.4.21-4.0.2.EL, kernel-BOOT 2.4.21-4.0.2.EL, kernel-source 2.4.21-4.0.2.EL, kernel-hugemem 2.4.21-4.0.2.EL, kernel-unsupported 2.4.21-4.0.2.EL, +2 more
    fixed: vendor fix RHSA-2003:416
  • Red Hat Enterprise Linux ES version 2.1
    fixed: vendor fix RHSA-2003:419
  • Red Hat Enterprise Linux ES version 3 kernel 2.4.21-4.0.2.EL, kernel-smp 2.4.21-4.0.2.EL, kernel-BOOT 2.4.21-4.0.2.EL, kernel-source 2.4.21-4.0.2.EL, kernel-hugemem 2.4.21-4.0.2.EL, kernel-unsupported 2.4.21-4.0.2.EL, +2 more
    fixed: vendor fix RHSA-2003:416
  • Red Hat Enterprise Linux WS version 2.1
    fixed: vendor fix RHSA-2003:419
  • Red Hat Enterprise Linux WS version 3 kernel 2.4.21-4.0.2.EL, kernel-smp 2.4.21-4.0.2.EL, kernel-BOOT 2.4.21-4.0.2.EL, kernel-source 2.4.21-4.0.2.EL, kernel-hugemem 2.4.21-4.0.2.EL, kernel-unsupported 2.4.21-4.0.2.EL, +2 more
    fixed: vendor fix RHSA-2003:416
  • Red Hat Linux 7.1 Red Hat Linux 7.2 Red Hat Linux 7.3 Red Hat Linux 8.0 Red Hat Linux 9
    fixed: vendor fix RHSA-2003:417
  • Red Hat Linux Advanced Workstation 2.1
    fixed: vendor fix RHSA-2003:418

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

Timeline

  1. First public exploit (EDB-141)
  2. Published

Exploit prediction

1.23% chance of exploitation in the next 30 days, higher than 69% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-145 Linux Kernel 2.4.23/2.6.0 - 'do_mremap()' Bound Checking Privilege Escalation local, 2004-01-15
  • EDB-142 Linux Kernel 2.4.23/2.6.0 - 'do_mremap()' Bound Checking Validator (2) local, 2004-01-07
  • EDB-141 Linux Kernel 2.4.23/2.6.0 - 'do_mremap()' Bound Checking Validator (1) local, 2004-01-06
  • securityfocus.com http://www.securityfocus.com/bid/9356 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 2.0 7.2 AV:L/AC:L/Au:N/C:C/I:C/A:C

Classification

Technology feeds

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.