CVE-2009-3726

NONECVSS 0.0Weaponized
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 12%CVSS: —Exploit: NoneExposed: 0

A fix is available — apply 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.

CVSS v3
—
EG Score
0.0(none)
EG Risk
0
EG Risk 0/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses intrinsic severity with real-world exploitation and automatability, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. It is distinct from the 0–10 EG Score, which measures severity.

EPSS
95.7%
KEV
Not listed

Published

November 9, 2009

Last Modified

April 23, 2026

References (50)

Vendor Advisories for CVE-2009-3726(3)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-2.6.31-16-powerpc (2.6.31-16.52) @ karmic2026-05-30ubuntu
redhatkernel-0:2.6.9-89.0.26.EL2010-06-15redhat
redhatkernel-0:2.6.18-164.9.1.el52009-12-15redhat
redhatkernel-rt-0:2.6.24.7-139.el5rt2009-12-03redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Additional Vendor Advisories

(1)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-23 01:00 UTCEG score recompute
  2. 2026-07-23 00:37 UTCEG score recompute
  3. 2026-07-23 00:04 UTCEG score recompute
  4. 2026-07-22 21:43 UTCEG score recompute
  5. 2026-07-22 14:03 UTCEPSS rescore
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  1. 2026-06-27 03:05 UTCEPSS rescore
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  43. 2026-05-31 00:13 UTCEPSS rescore
  44. 2026-05-30 14:40 UTCEG score recompute
  45. 2026-05-30 14:40 UTCVendor advisory
  46. 2026-05-30 14:40 UTCGHSA enrichment
  47. 2026-05-29 13:40 UTCEPSS rescore
  48. 2026-05-28 13:42 UTCEPSS rescore
  49. 2026-05-28 13:42 UTCEPSS rescore
  50. 2026-05-28 13:42 UTCEPSS rescore
  51. 2026-05-27 13:38 UTCEPSS rescore
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  62. 2026-05-18 21:29 UTCEPSS rescore

Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-10202✓ verified
    First seen Oct 15, 2009

    Linux Kernel < 2.6.31-rc4 - 'nfs4_proc_lock()' Denial of Service

    Open source ↗

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2009-3726?
CVE-2009-3726 is a none vulnerability published on November 9, 2009. The nfs4proclock 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…
When was CVE-2009-3726 disclosed?
CVE-2009-3726 was first published in the National Vulnerability Database on November 9, 2009, with the most recent update on April 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2009-3726 actively exploited?
CVE-2009-3726 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 95.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-3726?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-3726, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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