CVE-2011-1021

NONECVSS 0.0Weaponized
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 1%CVSS: —Exploit: NoneExposed: 0

A fix is available — apply it.

drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347.

CVSS v3
—
EG Score
0.0(none)
EPSS
56.2%
KEV
Not listed

Published

June 21, 2012

Last Modified

April 29, 2026

References (10)

Vendor Advisories for CVE-2011-1021(1)

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

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatkernel-rt-0:2.6.33.9-rt31.75.el6rt2011-09-12redhat

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.

Data Freshness Timeline

(refreshed 10× in last 7d / 44× 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. 2026-07-06 16:23 UTCEPSS rescore
  2. 2026-07-06 02:19 UTCEPSS rescore
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  15. 2026-06-27 03:05 UTCEPSS rescore
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  17. 2026-06-25 13:46 UTCEPSS rescore
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  1. 2026-06-19 19:22 UTCEPSS rescore
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  12. 2026-06-13 22:57 UTCEPSS rescore
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  20. 2026-06-07 15:22 UTCEPSS rescore
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  22. 2026-06-06 13:45 UTCEPSS rescore
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  27. 2026-06-04 13:09 UTCEPSS rescore
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  31. 2026-06-01 13:49 UTCEPSS rescore
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  37. 2026-05-29 13:41 UTCEPSS rescore
  38. 2026-05-29 13:40 UTCEPSS rescore
  39. 2026-05-29 04:14 UTCEG score recompute
  40. 2026-05-29 04:14 UTCVendor advisory
  41. 2026-05-29 04:13 UTCGHSA enrichment
  42. 2026-05-28 13:42 UTCEPSS rescore
  43. 2026-05-28 13:42 UTCEPSS rescore
  44. 2026-05-28 13:42 UTCEPSS rescore
  45. 2026-05-27 13:38 UTCEPSS rescore
  46. 2026-05-27 13:38 UTCEPSS rescore
  47. 2026-05-26 13:41 UTCEPSS rescore
  48. 2026-05-26 13:41 UTCEPSS rescore
  49. 2026-05-26 07:16 UTCEPSS rescore
  50. 2026-05-26 07:16 UTCEPSS rescore
  51. 2026-05-24 16:43 UTCEPSS rescore
  52. 2026-05-22 21:15 UTCEPSS rescore
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  55. 2026-05-20 22:37 UTCEPSS rescore
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  58. 2026-05-20 11:21 UTCEPSS rescore
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  60. 2026-05-20 11:21 UTCEPSS rescore
  61. 2026-05-18 21:29 UTCEPSS rescore
  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-15774✓ verified
    First seen Dec 18, 2010

    Linux Kernel < 2.6.37-rc2 - 'ACPI custom_method' Local Privilege Escalation

    Open source ↗

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2011-1021?
CVE-2011-1021 is a none vulnerability published on June 21, 2012. drivers/acpi/debugfs.c in the Linux kernel before 3.0 allows local users to modify arbitrary kernel memory locations by leveraging root privileges to write to the /sys/kernel/debug/acpi/custom_method file. NOTE: this vulnerability exists because of an incomplete fix for CVE-2010-4347.
When was CVE-2011-1021 disclosed?
CVE-2011-1021 was first published in the National Vulnerability Database on June 21, 2012, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-1021 actively exploited?
CVE-2011-1021 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 56.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2011-1021?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-1021, 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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