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CVE-2009-3726· NVD / CVE Program· CNA redhat

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 caus

Noroxi assessment

Priority: Monitor (action score 35/100)

  • Public proof-of-concept code exists (Exploit-DB); there is no record of exploitation in the wild.
  • Probability of exploitation in the next 30 days: 12% (FIRST EPSS); higher than 96% of all records.
  • No special conditions are required; it is repeatable.
  • Fixed version: linux-2.6 (Debian:4.0) 2.6.18.dfsg.1-26etch2; linux-2.6.24 (Debian:4.0) 2.6.24-6~etchnhalf.9etch3; kernel (Red Hat:enterprise_linux:4::as) 0:2.6.9-89.0.26.EL.

Low priority for now. Upgrade to linux-2.6 (Debian:4.0) 2.6.18.dfsg.1-26etch2; linux-2.6.24 (Debian:4.0) 2.6.24-6~etchnhalf.9etch3; kernel (Red Hat:enterprise_linux:4::as) 0:2.6.9-89.0.26.EL or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

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.

HighCVSS 7.8 · v2.0—Proof of concept Fix available
Published
Nov 9, 2009
Updated
Jun 16, 2026
EPSS
12.0% · 96th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
4 / 30 · 12.0%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • Proof of concept exists, no weaponized module
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2009-3726

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelup to 2.6.31 inclusive
  • linux linux kernel2.2.27
  • linux linux kernel2.4.1
  • linux linux kernel2.4.10
  • linux linux kernel2.4.11
  • linux linux kernel2.4.12
  • linux linux kernel2.4.13
  • linux linux kernel2.4.14
  • linux linux kernel2.4.15
  • linux linux kernel2.4.16
  • linux linux kernel2.4.17
  • linux linux kernel2.4.18
  • linux linux kernel2.4.19
  • linux linux kernel2.4.2
  • linux linux kernel2.4.20
  • linux linux kernel2.4.21
  • linux linux kernel2.4.22
  • linux linux kernel2.4.23
  • linux linux kernel2.4.24
  • linux linux kernel2.4.25

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:4.0linux-2.6before 2.6.18.dfsg.1-26etch22.6.18.dfsg.1-26etch2
Debian:4.0linux-2.6.24before 2.6.24-6~etchnhalf.9etch32.6.24-6~etchnhalf.9etch3
Red Hat:enterprise_linux:4::askernelbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-debuginfobefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-develbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-docbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-hugemembefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-hugemem-develbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-largesmpbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-largesmp-develbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-smpbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-smp-develbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-xenUbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:4::askernel-xenU-develbefore 0:2.6.9-89.0.26.EL0:2.6.9-89.0.26.EL
Red Hat:enterprise_linux:5::clientkernelbefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5
Red Hat:enterprise_linux:5::clientkernel-debugbefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5
Red Hat:enterprise_linux:5::clientkernel-debug-debuginfobefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5
Red Hat:enterprise_linux:5::clientkernel-debug-develbefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5
Red Hat:enterprise_linux:5::clientkernel-debuginfobefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5
Red Hat:enterprise_linux:5::clientkernel-debuginfo-commonbefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5
Red Hat:enterprise_linux:5::clientkernel-develbefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5
Red Hat:enterprise_linux:5::clientkernel-docbefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5
Red Hat:enterprise_linux:5::clientkernel-headersbefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5
Red Hat:enterprise_linux:5::clientkernel-PAEbefore 0:2.6.18-164.9.1.el50:2.6.18-164.9.1.el5

+22

Same product

linux: all records

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:linux-2.62.6.18.dfsg.1-26etch2 · Debian:4.0Package registry (OSV)
debian:linux-2.6.242.6.24-6~etchnhalf.9etch3 · Debian:4.0Package registry (OSV)
red hat:kernel-rt0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-debug0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-debug-debuginfo0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-debug-devel0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-debuginfo0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-debuginfo-common0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-devel0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-doc0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-trace0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-trace-debuginfo0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-trace-devel0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)
red hat:kernel-rt-vanilla0:2.6.24.7-139.el5rt · Red Hat:enterprise_mrg:1::el5Package registry (OSV)

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

  • Exploit-DB entry ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
SourceKindDate
Exploit-DB entrydos2009-10-15

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. First PoC-26 d
  2. Published
  3. TodayOct 12, 2026+6181 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
C · the service can be disrupted
Attack complexity
Low
Confidentiality impact
None
Integrity impact
None
Availability impact
C

Weakness class (CWE)

CWE-399 · Resource Management Errors

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (19 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records