CVE-2009-1895

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 0.4% exploitation probability in the next 30 days, which is reflected in EG Risk but does not lift the v2 base. Confidence: LOW.

Triggered by: NVD CVSS v2.0 (legacy fallback)
Sources: epss, nvd_v2
7.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS v2: 7.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The personality subsystem in the Linux kernel before 2.6.31-rc3 has a PER_CLEAR_ON_SETID setting that does not clear the ADDR_COMPAT_LAYOUT and MMAP_PAGE_ZERO flags when executing a setuid or setgid program, which makes it easier for local users to leverage the details of memory usage to (1) conduct NULL pointer dereference attacks, (2) bypass the mmap_min_addr protection mechanism, or (3) defeat address space layout randomization (ASLR).

CVSS v2.0 (legacy)
7.2HIGHNVD never assigned a CVSS v3 rating to this CVE
EG Score
7.2HIGHlow confidence
EG Risk
37
EG Risk 37/100CISA 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
Severity72% × 45%
Exploitation0% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or 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
0.4%
EPSS %ILE
36th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or 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 none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact unknown (not published for this CVE). 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

July 16, 2009

Last Modified

April 23, 2026

References (70)

Vendor Advisories for CVE-2009-1895(4)

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

Patch Availability(6)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-image-2.6.28-14-virtual (2.6.28-14.47) @ jaunty2026-05-30ubuntu
redhatkernel-0:2.6.18-92.1.35.el52010-02-02redhat
redhatkernel-0:2.4.21-63.EL2009-11-03redhat
redhatkernel-rt-0:2.6.24.7-137.el5rt2009-11-03redhat
redhatkernel-0:2.6.9-89.0.11.EL2009-09-15redhat
redhatkernel-0:2.6.18-128.4.1.el52009-08-04redhat

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

(2 across 2 ecosystems)
Debian:4.0(1)
PackageVulnerable rangeFix by version rangeDependents
linux-2.6.242.6.24-5~etchnhalf.1 ... 2.6.24-6~etchnhalf.8etch1 (10 versions)
  • every version up to 2.6.24-6~etchnhalf.8etch2: fixed in 2.6.24-6~etchnhalf.8etch2
—
Debian:5.0(1)
PackageVulnerable rangeFix by version rangeDependents
linux-2.62.6.26-13 ... 2.6.26-17~bpo40+1 (13 versions)
  • every version up to 2.6.26-17lenny1: fixed in 2.6.26-17lenny1
—

Additional Vendor Advisories

(2)

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 134 total refreshes for this CVE.

  1. 2026-10-09 20:00 UTCEPSS rescore
  2. 2026-10-08 16:33 UTCEPSS rescore
  3. 2026-10-07 23:37 UTCEPSS rescore
  4. 2026-10-06 15:09 UTCEPSS rescore
  5. 2026-10-05 17:37 UTCEPSS rescore
  6. 2026-10-04 23:15 UTCEPSS rescore
  7. 2026-09-30 14:58 UTCEPSS rescore
  8. 2026-09-29 07:58 UTCEG score recompute
  9. 2026-09-27 13:39 UTCEPSS rescore
  10. 2026-09-26 15:52 UTCEPSS rescore
  11. 2026-09-24 13:57 UTCEPSS rescore
  12. 2026-09-17 19:20 UTCEPSS rescore
  13. 2026-09-15 03:04 UTCEPSS rescore
  14. 2026-09-13 16:40 UTCEPSS rescore
  15. 2026-09-12 14:54 UTCEPSS rescore
  16. 2026-09-10 09:24 UTCEPSS rescore
  17. 2026-09-06 13:41 UTCEPSS rescore
  18. 2026-09-05 15:22 UTCEPSS rescore
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  20. 2026-08-28 21:34 UTCEPSS rescore
  21. 2026-08-27 14:19 UTCEPSS rescore
  22. 2026-08-25 13:43 UTCEPSS rescore
  23. 2026-08-19 16:58 UTCEPSS rescore
  24. 2026-08-15 01:24 UTCEPSS rescore
  25. 2026-08-09 13:41 UTCEPSS rescore
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  1. 2026-08-08 16:31 UTCEPSS rescore
  2. 2026-08-06 13:41 UTCEPSS rescore
  3. 2026-08-03 10:28 UTCEPSS rescore
  4. 2026-07-30 16:22 UTCEPSS rescore
  5. 2026-07-30 01:26 UTCEPSS rescore
  6. 2026-07-26 13:38 UTCEG score recompute▲ 7.20
  7. 2026-07-25 14:12 UTCEPSS rescore
  8. 2026-07-24 14:12 UTCEPSS rescore
  9. 2026-07-23 14:14 UTCEPSS rescore
  10. 2026-07-23 00:59 UTCEG score recompute
  11. 2026-07-23 00:37 UTCEG score recompute
  12. 2026-07-23 00:03 UTCEG score recompute
  13. 2026-07-22 21:42 UTCEG score recompute
  14. 2026-07-22 14:03 UTCEPSS rescore
  15. 2026-07-21 15:20 UTCEPSS rescore
  16. 2026-07-20 17:03 UTCEPSS rescore
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  18. 2026-07-18 09:59 UTCEPSS rescore
  19. 2026-07-16 16:58 UTCEPSS rescore
  20. 2026-07-15 16:54 UTCEPSS rescore
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  22. 2026-07-15 01:55 UTCEPSS rescore
  23. 2026-07-13 22:25 UTCEPSS rescore
  24. 2026-07-13 06:07 UTCEPSS rescore
  25. 2026-07-11 08:22 UTCEPSS rescore
  26. 2026-07-11 08:22 UTCEPSS rescore
  27. 2026-07-09 19:04 UTCEPSS rescore
  28. 2026-07-08 15:10 UTCEPSS rescore
  29. 2026-07-06 16:23 UTCEPSS rescore
  30. 2026-07-06 02:19 UTCEPSS rescore
  31. 2026-07-06 02:19 UTCEPSS rescore
  32. 2026-07-05 02:26 UTCEPSS rescore
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  34. 2026-07-04 06:27 UTCEPSS rescore
  35. 2026-07-01 15:02 UTCEPSS rescore
  36. 2026-06-30 23:19 UTCEPSS rescore
  37. 2026-06-29 14:02 UTCEPSS rescore
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  39. 2026-06-28 14:03 UTCEPSS rescore
  40. 2026-06-28 04:52 UTCEPSS rescore
  41. 2026-06-28 04:52 UTCEPSS rescore
  42. 2026-06-27 03:05 UTCEPSS rescore
  43. 2026-06-25 13:46 UTCEPSS rescore
  44. 2026-06-25 13:46 UTCEPSS rescore
  45. 2026-06-24 14:02 UTCEPSS rescore
  46. 2026-06-24 14:02 UTCEPSS rescore
  47. 2026-06-23 21:29 UTCEPSS rescore
  48. 2026-06-23 21:29 UTCEPSS rescore
  49. 2026-06-22 14:22 UTCEPSS rescore
  50. 2026-06-22 14:22 UTCEPSS rescore
  51. 2026-06-21 14:53 UTCEPSS rescore
  52. 2026-06-21 01:56 UTCEPSS rescore
  53. 2026-06-21 01:56 UTCEPSS rescore
  54. 2026-06-19 19:22 UTCEPSS rescore
  55. 2026-06-19 19:22 UTCEPSS rescore
  56. 2026-06-18 17:49 UTCEPSS rescore
  57. 2026-06-18 17:49 UTCEPSS rescore
  58. 2026-06-17 17:49 UTCEPSS rescore
  59. 2026-06-17 17:49 UTCEPSS rescore
  60. 2026-06-16 17:49 UTCEPSS rescore
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  62. 2026-06-15 17:44 UTCEPSS rescore
  63. 2026-06-14 23:14 UTCEPSS rescore
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  65. 2026-06-13 22:57 UTCEPSS rescore
  66. 2026-06-12 23:08 UTCEPSS rescore
  67. 2026-06-12 23:08 UTCEPSS rescore
  68. 2026-06-10 22:14 UTCEPSS rescore
  69. 2026-06-10 13:17 UTCEPSS rescore
  70. 2026-06-08 14:13 UTCEPSS rescore
  71. 2026-06-07 15:22 UTCEPSS rescore
  72. 2026-06-07 15:22 UTCEPSS rescore
  73. 2026-06-06 13:44 UTCEPSS rescore
  74. 2026-06-06 13:44 UTCEPSS rescore
  75. 2026-06-06 13:44 UTCEPSS rescore

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Frequently asked(4)

What is CVE-2009-1895?
CVE-2009-1895 is a high vulnerability published on July 16, 2009. The personality subsystem in the Linux kernel before 2.6.31-rc3 has a PERCLEARONSETID setting that does not clear the ADDRCOMPATLAYOUT and MMAPPAGEZERO flags when executing a setuid or setgid program, which makes it easier for local users to leverage the details of memory usage to (1) conduct NULL…
When was CVE-2009-1895 disclosed?
CVE-2009-1895 was first published on July 16, 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-2009-1895 actively exploited?
CVE-2009-1895 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
How do I remediate CVE-2009-1895?
A fix for CVE-2009-1895 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2009-1895 are linked in the Vendor Advisories panel on this page.

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