CVE-2009-3547

HIGHNVD 7.07.0—
EchelonGraph scoreMEDIUM confidence

Score 7.0 from GitHub Security Advisory (severity: HIGH) published 2022-05-02. NVD baseline CVSS 7.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Weaponized
7.0EG
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: 4.9%CVSS: 7.0Exploit: Exploit-DB (verified) · public exploitExposed services: Not assessed

A fix is available — apply it.

Multiple race conditions in fs/pipe.c in the Linux kernel before 2.6.32-rc6 allow local users to cause a denial of service (NULL pointer dereference and system crash) or gain privileges by attempting to open an anonymous pipe via a /proc/*/fd/ pathname.

CVSS v3
7.0
EG Score
7.0HIGHmedium confidence
EG Risk
62
EG Risk 62/100CISA SSVC

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
Severity70% × 45%
Exploitation65% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
4.9%
EPSS %ILE
91st
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (EG-KEV: weaponized) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

November 4, 2009

Last Modified

April 23, 2026

Advisory Details (4)

Auto-updated Sep 11, 2026
Patch available.
generic

Secunia Research & Vulnerability Insights | Flexera

http://secunia.com/advisories/37351
generic

'[oss-security] CVE-2009-3547 kernel: fs: pipe.c null pointer dereference' - MARC

http://marc.info/?l=oss-security&m=125724568017045&w=2
generic

LKML: =?UTF-8?Q?Am=C3=A9rico_Wang?=: Re: [PATCH v4 1/1]: fs: pipe.c null pointer dereference + really sign off + unmangled diffs

http://lkml.org/lkml/2009/10/21/42
generic

LKML: Earl Chew: fs/pipe.c null pointer dereference

http://lkml.org/lkml/2009/10/14/184

Vendor Advisories for CVE-2009-3547(7)

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

Patch Availability(8)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-image-2.6.31-16-powerpc (2.6.31-16.52) @ karmic2026-05-30ubuntu
redhatkernel-0:2.6.18-92.1.32.el52009-12-15redhat
redhatkernel-0:2.6.18-128.11.1.el52009-11-17redhat
redhatkernel-0:2.6.9-78.0.28.EL2009-11-17redhat
redhatkernel-rt-0:2.6.24.7-137.el5rt2009-11-03redhat
redhatkernel-0:2.4.21-63.EL2009-11-03redhat
redhatkernel-0:2.6.9-89.0.16.EL2009-11-03redhat
redhatkernel-0:2.6.18-164.6.1.el52009-11-03redhat

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.

Affected Packages

(3 across 2 ecosystems)
Debian:4.0(2)
PackageVulnerable rangeFix by version rangeDependents
linux-2.62.6.18.dfsg.1-12 ... 2.6.18.dfsg.1-26 (37 versions)
  • every version up to 2.6.18.dfsg.1-26etch1: fixed in 2.6.18.dfsg.1-26etch1
—
linux-2.6.242.6.24-5~etchnhalf.1 ... 2.6.24-6~etchnhalf.9 (13 versions)
  • every version up to 2.6.24-6~etchnhalf.9etch1: fixed in 2.6.24-6~etchnhalf.9etch1
—
Debian:5.0(1)
PackageVulnerable rangeFix by version rangeDependents
linux-2.62.6.26-13 ... 2.6.26-19~bpo40+1 (20 versions)
  • every version up to 2.6.26-19lenny2: fixed in 2.6.26-19lenny2
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

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 6× in last 7d / 15× 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 127 total refreshes for this CVE.

  1. 2026-10-09 20:00 UTCEPSS rescore
  2. 2026-10-08 16:33 UTCEPSS rescore
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  8. 2026-09-29 08:00 UTCEG score recompute
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  1. 2026-08-03 10:28 UTCEPSS rescore
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  7. 2026-07-23 01:00 UTCEG score recompute
  8. 2026-07-23 00:37 UTCEG score recompute
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  10. 2026-07-22 21:43 UTCEG score recompute
  11. 2026-07-22 14:03 UTCEPSS rescore
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Publicly available exploits

(5 references)

Working exploit code is in the public domain (5 Exploit-DB entries). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • Exploit-DBEDB-10018✓ verified
    First seen Nov 12, 2009

    Linux Kernel 2.6.32 - 'pipe.c' Local Privilege Escalation (4)

    Open source ↗
  • Exploit-DBEDB-9844✓ verified
    First seen Nov 5, 2009

    Linux Kernel 2.4.1 < 2.4.37 / 2.6.1 < 2.6.32-rc5 - 'pipe.c' Local Privilege Escalation (3)

    Open source ↗
  • Exploit-DBEDB-33321✓ verified
    First seen Nov 3, 2009

    Linux Kernel 2.6.0 < 2.6.31 - 'pipe.c' Local Privilege Escalation (1)

    Open source ↗
  • Exploit-DBEDB-33322✓ verified
    First seen Nov 3, 2009

    Linux Kernel 2.6.x - 'pipe.c' Local Privilege Escalation (2)

    Open source ↗
  • Exploit-DBEDB-40812
    First seen Dec 16, 2013

    Linux Kernel 2.6.10 < 2.6.31.5 - 'pipe.c' Local Privilege Escalation

    Open source ↗

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2009-3547?
CVE-2009-3547 is a high vulnerability published on November 4, 2009. Multiple race conditions in fs/pipe.c in the Linux kernel before 2.6.32-rc6 allow local users to cause a denial of service (NULL pointer dereference and system crash) or gain privileges by attempting to open an anonymous pipe via a /proc/*/fd/ pathname.
When was CVE-2009-3547 disclosed?
CVE-2009-3547 was first published on November 4, 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-2009-3547 actively exploited?
CVE-2009-3547 is not currently on CISA's Known Exploited Vulnerabilities catalog. EchelonGraph's EG-KEV model classifies it as weaponized: a functional public exploit exists. FIRST EPSS estimates a 4.9% probability of exploitation in the next 30 days (91st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2009-3547?
CVE-2009-3547 has a CVSS v3 base score of 7.0 (NVD).
How do I remediate CVE-2009-3547?
A fix for CVE-2009-3547 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2009-3547 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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