CVE-2009-4020

NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 5%CVSS: —Exploit: NoneExposed: 0

A fix is available — apply it.

Stack-based buffer overflow in the hfs subsystem in the Linux kernel 2.6.32 allows remote attackers to have an unspecified impact via a crafted Hierarchical File System (HFS) filesystem, related to the hfs_readdir function in fs/hfs/dir.c.

CVSS v3
—
EG Score
0.0(none)
EPSS
91.3%
KEV
Not listed

Published

December 4, 2009

Last Modified

April 23, 2026

References (30)

Vendor Advisories for CVE-2009-4020(2)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-2.6.31-19-ia64 (2.6.31-19.56) @ karmic2026-05-30ubuntu
redhatkernel-0:2.6.9-89.0.20.EL2010-02-02redhat
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.

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 7× in last 7d / 34× 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. 2026-07-22 21:43 UTCEG score recompute
  2. 2026-07-22 14:03 UTCEPSS rescore
  3. 2026-07-21 15:20 UTCEPSS rescore
  4. 2026-07-20 17:03 UTCEPSS rescore
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  6. 2026-07-18 09:59 UTCEPSS rescore
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  15. 2026-07-09 19:04 UTCEPSS rescore
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  24. 2026-06-30 23:19 UTCEPSS rescore
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  1. 2026-06-28 04:52 UTCEPSS rescore
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  20. 2026-06-16 17:49 UTCEPSS rescore
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  22. 2026-06-15 17:44 UTCEPSS rescore
  23. 2026-06-13 22:57 UTCEPSS rescore
  24. 2026-06-12 23:08 UTCEPSS rescore
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  26. 2026-06-10 22:14 UTCEPSS rescore
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  40. 2026-06-02 20:10 UTCEPSS rescore
  41. 2026-06-01 13:49 UTCEPSS rescore
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  43. 2026-05-31 22:28 UTCEPSS rescore
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  45. 2026-05-31 00:13 UTCEPSS rescore
  46. 2026-05-31 00:13 UTCEPSS rescore
  47. 2026-05-30 14:25 UTCEG score recompute
  48. 2026-05-30 14:25 UTCVendor advisory
  49. 2026-05-30 14:25 UTCGHSA enrichment
  50. 2026-05-29 13:40 UTCEPSS rescore
  51. 2026-05-28 13:42 UTCEPSS rescore
  52. 2026-05-28 13:42 UTCEPSS rescore
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  54. 2026-05-27 13:38 UTCEPSS rescore
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  56. 2026-05-26 13:41 UTCEPSS rescore
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  58. 2026-05-26 07:16 UTCEPSS rescore
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  60. 2026-05-24 16:43 UTCEPSS rescore
  61. 2026-05-22 21:15 UTCEPSS rescore
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  63. 2026-05-20 22:37 UTCEPSS rescore
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  67. 2026-05-18 21:29 UTCEPSS rescore

Frequently asked(4)

What is CVE-2009-4020?
CVE-2009-4020 is a none vulnerability published on December 4, 2009. Stack-based buffer overflow in the hfs subsystem in the Linux kernel 2.6.32 allows remote attackers to have an unspecified impact via a crafted Hierarchical File System (HFS) filesystem, related to the hfs_readdir function in fs/hfs/dir.c.
When was CVE-2009-4020 disclosed?
CVE-2009-4020 was first published in the National Vulnerability Database on December 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-2009-4020 actively exploited?
CVE-2009-4020 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 91.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-4020?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-4020, 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.

Dependency Blast Radius

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