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Fencer Vulns
medium 4.9

CVE-2009-1336 json

fs/nfs/client.c in the Linux kernel before 2.6.23 does not properly initialize a certain structure member that stores the maximum NFS filen…

published 2009-04-22 17 y ago modified 2026-06-16 4 mo ago also EUVD-2009-1334

cvss
4.9
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 35%
public exploits
0
none known

Summary

fs/nfs/client.c in the Linux kernel before 2.6.23 does not properly initialize a certain structure member that stores the maximum NFS filename length, which allows local users to cause a denial of service (OOPS) via a long filename, related to the encode_lookup function.

Patch / fix

  • kernel RHEL 5 2.6.18-128.1.10.el5
  • kernel-PAE RHEL 5 2.6.18-128.1.10.el5
  • kernel-xen RHEL 5 2.6.18-128.1.10.el5
  • kernel-kdump RHEL 5 2.6.18-128.1.10.el5
  • kernel-debuginfo-common RHEL 5 2.6.18-128.1.10.el5
  • kernel RHEL 4 2.6.9-89.EL
  • kernel-smp RHEL 4 2.6.9-89.EL
  • kernel-xenU RHEL 4 2.6.9-89.EL

red hat advisories RHSA-2009:0473RHSA-2009:1077RHSA-2009:1024

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-2009-1336 updated cvss 4.9

kernel: nfsv4 client can be crashed by stating a long filename

  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-128.1.10.el5, kernel-PAE 2.6.18-128.1.10.el5, kernel-xen 2.6.18-128.1.10.el5, kernel-kdump 2.6.18-128.1.10.el5, kernel-debuginfo-common 2.6.18-128.1.10.el5
    fixed: vendor fix RHSA-2009:0473
  • Red Hat Enterprise Linux AS EUS (v. 4.7) kernel 2.6.9-78.0.24.EL, kernel-smp 2.6.9-78.0.24.EL, kernel-xenU 2.6.9-78.0.24.EL, kernel-hugemem 2.6.9-78.0.24.EL, kernel-largesmp 2.6.9-78.0.24.EL
    fixed: vendor fix RHSA-2009:1077
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-89.EL, kernel-smp 2.6.9-89.EL, kernel-xenU 2.6.9-89.EL, kernel-hugemem 2.6.9-89.EL, kernel-largesmp 2.6.9-89.EL
    fixed: vendor fix RHSA-2009:1024
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-128.1.10.el5, kernel-PAE 2.6.18-128.1.10.el5, kernel-xen 2.6.18-128.1.10.el5, kernel-kdump 2.6.18-128.1.10.el5, kernel-debuginfo-common 2.6.18-128.1.10.el5
    fixed: vendor fix RHSA-2009:0473
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-89.EL, kernel-smp 2.6.9-89.EL, kernel-xenU 2.6.9-89.EL, kernel-hugemem 2.6.9-89.EL, kernel-largesmp 2.6.9-89.EL
    fixed: vendor fix RHSA-2009:1024
  • Red Hat Enterprise Linux ES EUS (v. 4.7) kernel 2.6.9-78.0.24.EL, kernel-smp 2.6.9-78.0.24.EL, kernel-xenU 2.6.9-78.0.24.EL, kernel-hugemem 2.6.9-78.0.24.EL, kernel-largesmp 2.6.9-78.0.24.EL
    fixed: vendor fix RHSA-2009:1077
  • Red Hat Enterprise Linux ES version 4 kernel 2.6.9-89.EL, kernel-smp 2.6.9-89.EL, kernel-xenU 2.6.9-89.EL, kernel-hugemem 2.6.9-89.EL, kernel-largesmp 2.6.9-89.EL Red Hat Enterprise Linux WS version 4 kernel 2.6.9-89.EL, kernel-smp 2.6.9-89.EL, kernel-xenU 2.6.9-89.EL, kernel-hugemem 2.6.9-89.EL, kernel-largesmp 2.6.9-89.EL
    fixed: vendor fix RHSA-2009:1024

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

0.41% chance of exploitation in the next 30 days, higher than 35% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 2.0 4.9 AV:L/AC:L/Au:N/C:N/I:N/A:C

Classification

Weakness
  • CWE-20 Improper Input Validation
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.