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Fencer Vulns
high 7.8

CVE-2009-3726 in the critical feed json

The nfs4_proc_lock function in fs/nfs/nfs4proc.c in the NFSv4 client in the Linux kernel before 2.6.31-rc4 allows remote NFS servers to cau…

published 2009-11-09 16 y ago modified 2026-06-16 4 mo ago also EUVD-2009-3698

cvss
7.8
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
12.0%
EPSS 12.0% chance of exploitation in 30 days, percentile 96%
public exploits
1
Exploit-DB

Summary

The nfs4_proc_lock function in fs/nfs/nfs4proc.c in the NFSv4 client in the Linux kernel before 2.6.31-rc4 allows remote NFS servers to cause a denial of service (NULL pointer dereference and panic) by sending a certain response containing incorrect file attributes, which trigger attempted use of an open file that lacks NFSv4 state.

Patch / fix

  • kernel RHEL 4 2.6.9-89.0.26.EL
  • kernel-smp RHEL 4 2.6.9-89.0.26.EL
  • kernel-xenU RHEL 4 2.6.9-89.0.26.EL
  • kernel-hugemem RHEL 4 2.6.9-89.0.26.EL
  • kernel-largesmp RHEL 4 2.6.9-89.0.26.EL
  • kernel RHEL 5 2.6.18-164.9.1.el5
  • kernel-PAE RHEL 5 2.6.18-164.9.1.el5
  • kernel-xen RHEL 5 2.6.18-164.9.1.el5

red hat advisories RHSA-2010:0474RHSA-2009:1670RHSA-2009:1635

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-2009-3726 updated cvss 7.2

kernel: nfsv4: kernel panic in nfs4_proc_lock()

  • Red Hat MRG Realtime for RHEL 5 Server kernel-rt 2.6.24.7-139.el5rt, kernel-rt-trace 2.6.24.7-139.el5rt, kernel-rt-vanilla 2.6.24.7-139.el5rt, kernel-rt-debuginfo-common 2.6.24.7-139.el5rt
    fixed: vendor fix RHSA-2009:1635
  • Red Hat Enterprise Linux (v. 5 server) kernel 2.6.18-164.9.1.el5, kernel-PAE 2.6.18-164.9.1.el5, kernel-xen 2.6.18-164.9.1.el5, kernel-kdump 2.6.18-164.9.1.el5, kernel-debuginfo-common 2.6.18-164.9.1.el5
    fixed: vendor fix RHSA-2009:1670
  • Red Hat Enterprise Linux AS version 4 kernel 2.6.9-89.0.26.EL, kernel-smp 2.6.9-89.0.26.EL, kernel-xenU 2.6.9-89.0.26.EL, kernel-hugemem 2.6.9-89.0.26.EL, kernel-largesmp 2.6.9-89.0.26.EL
    fixed: vendor fix RHSA-2010:0474
  • Red Hat Enterprise Linux Desktop (v. 5 client) kernel 2.6.18-164.9.1.el5, kernel-PAE 2.6.18-164.9.1.el5, kernel-xen 2.6.18-164.9.1.el5, kernel-debuginfo-common 2.6.18-164.9.1.el5
    fixed: vendor fix RHSA-2009:1670
  • Red Hat Enterprise Linux Desktop version 4 kernel 2.6.9-89.0.26.EL, kernel-smp 2.6.9-89.0.26.EL, kernel-xenU 2.6.9-89.0.26.EL, kernel-hugemem 2.6.9-89.0.26.EL, kernel-largesmp 2.6.9-89.0.26.EL Red Hat Enterprise Linux ES version 4 kernel 2.6.9-89.0.26.EL, kernel-smp 2.6.9-89.0.26.EL, kernel-xenU 2.6.9-89.0.26.EL, kernel-hugemem 2.6.9-89.0.26.EL, kernel-largesmp 2.6.9-89.0.26.EL Red Hat Enterprise Linux WS version 4 kernel 2.6.9-89.0.26.EL, kernel-smp 2.6.9-89.0.26.EL, kernel-xenU 2.6.9-89.0.26.EL, kernel-hugemem 2.6.9-89.0.26.EL, kernel-largesmp 2.6.9-89.0.26.EL
    fixed: vendor fix RHSA-2010:0474

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-10202)
  2. Published

Exploit prediction

12.00% chance of exploitation in the next 30 days, higher than 96% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • EDB-10202 Linux Kernel < 2.6.31-rc4 - 'nfs4_proc_lock()' Denial of Service dos, 2009-10-15

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-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.