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Fencer Vulns
high 7.1

CVE-2009-4308 json

The ext4_decode_error function in fs/ext4/super.c in the ext4 filesystem in the Linux kernel before 2.6.32 allows user-assisted remote atta…

published 2009-12-13 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-4276

cvss
7.1
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.5%
EPSS 3.5% chance of exploitation in 30 days, percentile 89%
public exploits
0
none known

Summary

The ext4_decode_error function in fs/ext4/super.c in the ext4 filesystem in the Linux kernel before 2.6.32 allows user-assisted remote attackers to cause a denial of service (NULL pointer dereference), and possibly have unspecified other impact, via a crafted read-only filesystem that lacks a journal.

Patch / fix

  • kernel RHEL 5 2.6.18-164.15.1.el5
  • kernel-PAE RHEL 5 2.6.18-164.15.1.el5
  • kernel-xen RHEL 5 2.6.18-164.15.1.el5
  • kernel-kdump RHEL 5 2.6.18-164.15.1.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-164.15.1.el5

red hat advisories RHSA-2010:0147

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-2009-4308 updated cvss 6.2

kernel: ext4: Avoid null pointer dereference when decoding EROFS w/o a journal

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-164.15.1.el5, kernel-PAE 2.6.18-164.15.1.el5, kernel-xen 2.6.18-164.15.1.el5, kernel-kdump 2.6.18-164.15.1.el5, kernel-debuginfo-common 2.6.18-164.15.1.el5 Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-164.15.1.el5, kernel-PAE 2.6.18-164.15.1.el5, kernel-xen 2.6.18-164.15.1.el5, kernel-kdump 2.6.18-164.15.1.el5, kernel-debuginfo-common 2.6.18-164.15.1.el5
    fixed: vendor fix RHSA-2010:0147

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

3.47% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 7.1 AV:N/AC:M/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-399 Resource Management Errors
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.