CVE-2009-4141

HIGHCVSS v2 · 7.27.2—
EchelonGraph scoreLOW confidence

This CVE was only ever scored under CVSS v2.0. NVD CVSS v2.0 base 7.2 — v2 rates that HIGH (v2 bands: LOW 0.0–3.9 / MEDIUM 4.0–6.9 / HIGH 7.0–10.0; v2 has no CRITICAL band). Vector AV:L/AC:L/Au:N/C:C/I:C/A:C. CVSS v2 is an older, coarser metric than v3.1/v4.0 (no Scope, no User Interaction, no Attack Requirements), so it is not directly comparable to a v3 or v4 score. NVD has never re-scored this record under v3. EPSS predicts 1.0% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Sources: epss, nvd_v2
Weaponized
7.2EG
EchelonGraph verdictPatch this weekExploitation is likely or a public exploit exists.
  • Public exploit code is available (Exploit-DB (verified), public exploit)
CISA-KEV: Not listedEPSS PROB: 1%CVSS v2: 7.2Exploit: Exploit-DB (verified) · public exploitExposed: 0

A fix is available — apply it.

Use-after-free vulnerability in the fasync_helper function in fs/fcntl.c in the Linux kernel before 2.6.33-rc4-git1 allows local users to gain privileges via vectors that include enabling O_ASYNC (aka FASYNC or FIOASYNC) on a locked file, and then closing this file.

CVSS v2.0 (legacy)
7.2HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.2(low)
EG Risk
63(Track)
EG Risk 63/100SSVC: Track

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. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity72% × 45%
Exploitation65% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
59%
KEV
Not listed

Published

January 19, 2010

Last Modified

April 23, 2026

References (32)

Vendor Advisories for CVE-2009-4141(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-2.6.31-19-ia64 (2.6.31-19.56) @ karmic2026-05-29ubuntu
redhatkernel-rt-0:2.6.24.7-149.el5rt2010-03-23redhat
redhatkernel-0:2.6.18-128.14.1.el52010-03-17redhat
redhatkernel-0:2.6.18-164.11.1.el52010-01-19redhat

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 12× in last 7d / 36× 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.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-26 13:39 UTCEG score recompute▲ 7.20
  2. 2026-07-25 14:12 UTCEPSS rescore
  3. 2026-07-24 14:12 UTCEPSS rescore
  4. 2026-07-23 14:14 UTCEPSS rescore
  5. 2026-07-23 01:00 UTCEG score recompute
  6. 2026-07-23 00:37 UTCEG score recompute
  7. 2026-07-23 00:04 UTCEG score recompute
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  9. 2026-07-22 14:03 UTCEPSS rescore
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  59. 2026-05-29 13:40 UTCEPSS rescore
  60. 2026-05-29 13:00 UTCEG score recompute
  61. 2026-05-29 13:00 UTCVendor advisory
  62. 2026-05-29 13:00 UTCGHSA enrichment
  63. 2026-05-28 13:42 UTCEPSS rescore
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  75. 2026-05-20 22:37 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-33523✓ verified
    First seen Dec 16, 2009

    Linux Kernel < 2.6.28 - 'fasync_helper()' Local Privilege Escalation

    Open source ↗

Frequently asked(4)

What is CVE-2009-4141?
CVE-2009-4141 is a high vulnerability published on January 19, 2010. Use-after-free vulnerability in the fasynchelper function in fs/fcntl.c in the Linux kernel before 2.6.33-rc4-git1 allows local users to gain privileges via vectors that include enabling OASYNC (aka FASYNC or FIOASYNC) on a locked file, and then closing this file.
When was CVE-2009-4141 disclosed?
CVE-2009-4141 was first published in the National Vulnerability Database on January 19, 2010, 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-2009-4141 actively exploited?
CVE-2009-4141 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 41.5% of all scored CVEs.
How do I remediate CVE-2009-4141?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-4141, 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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