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Fencer Vulns
high 7.8

CVE-2009-4020 json

Stack-based buffer overflow in the hfs subsystem in the Linux kernel 2.6.32 allows remote attackers to have an unspecified impact via a cra…

published 2009-12-04 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3991

cvss
7.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
4.8%
EPSS 4.8% chance of exploitation in 30 days, percentile 91%
public exploits
0
none known

Summary

Stack-based buffer overflow in the hfs subsystem in the Linux kernel 2.6.32 allows remote attackers to have an unspecified impact via a crafted Hierarchical File System (HFS) filesystem, related to the hfs_readdir function in fs/hfs/dir.c.

Patch / fix

  • kernel RHEL 4 2.6.9-89.0.20.EL
  • kernel-smp RHEL 4 2.6.9-89.0.20.EL
  • kernel-xenU RHEL 4 2.6.9-89.0.20.EL
  • kernel-hugemem RHEL 4 2.6.9-89.0.20.EL
  • kernel-largesmp RHEL 4 2.6.9-89.0.20.EL
  • kernel RHEL 5 2.6.18-164.11.1.el5
  • kernel-PAE RHEL 5 2.6.18-164.11.1.el5
  • kernel-xen RHEL 5 2.6.18-164.11.1.el5

red hat advisories RHSA-2010:0076RHSA-2010:0046

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-2009-4020 updated cvss 6.2

kernel: hfs buffer overflow

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-kdump 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5
    fixed: vendor fix RHSA-2010:0046
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-89.0.20.EL, kernel-smp 2.6.9-89.0.20.EL, kernel-xenU 2.6.9-89.0.20.EL, kernel-hugemem 2.6.9-89.0.20.EL, kernel-largesmp 2.6.9-89.0.20.EL
    fixed: vendor fix RHSA-2010:0076
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-164.11.1.el5, kernel-PAE 2.6.18-164.11.1.el5, kernel-xen 2.6.18-164.11.1.el5, kernel-kdump 2.6.18-164.11.1.el5, kernel-debuginfo-common 2.6.18-164.11.1.el5
    fixed: vendor fix RHSA-2010:0046
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-89.0.20.EL, kernel-smp 2.6.9-89.0.20.EL, kernel-xenU 2.6.9-89.0.20.EL, kernel-hugemem 2.6.9-89.0.20.EL, kernel-largesmp 2.6.9-89.0.20.EL Red Hat Enterprise Linux ES version 4 kernel 2.6.9-89.0.20.EL, kernel-smp 2.6.9-89.0.20.EL, kernel-xenU 2.6.9-89.0.20.EL, kernel-hugemem 2.6.9-89.0.20.EL, kernel-largesmp 2.6.9-89.0.20.EL Red Hat Enterprise Linux WS version 4 kernel 2.6.9-89.0.20.EL, kernel-smp 2.6.9-89.0.20.EL, kernel-xenU 2.6.9-89.0.20.EL, kernel-hugemem 2.6.9-89.0.20.EL, kernel-largesmp 2.6.9-89.0.20.EL
    fixed: vendor fix RHSA-2010:0076

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

4.76% chance of exploitation in the next 30 days, higher than 91% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.8 AV:N/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
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.