CVE-2011-2521

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

A fix is available — apply it.

The x86_assign_hw_event function in arch/x86/kernel/cpu/perf_event.c in the Performance Events subsystem in the Linux kernel before 2.6.39 does not properly calculate counter values, which allows local users to cause a denial of service (panic) via the perf program.

CVSS v3
—
EG Score
0.0(none)
EPSS
31.6%
KEV
Not listed

Published

May 24, 2012

Last Modified

April 29, 2026

References (10)

Vendor Advisories for CVE-2011-2521(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-0:2.6.32-131.17.1.el62011-10-05redhat

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
  3. 2026-07-06 02:19 UTCEPSS rescore
  4. 2026-07-05 02:26 UTCEPSS rescore
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  9. 2026-06-30 23:19 UTCEPSS rescore
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  11. 2026-06-29 14:02 UTCEPSS rescore
  12. 2026-06-28 14:03 UTCEPSS rescore
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  14. 2026-06-28 04:52 UTCEPSS rescore
  15. 2026-06-27 03:05 UTCEPSS rescore
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  17. 2026-06-25 13:46 UTCEPSS rescore
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  20. 2026-06-23 21:30 UTCEPSS rescore
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  24. 2026-06-21 01:56 UTCEPSS rescore
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  1. 2026-06-19 19:22 UTCEPSS rescore
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  3. 2026-06-18 17:49 UTCEPSS rescore
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  5. 2026-06-17 17:49 UTCEPSS rescore
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  8. 2026-06-16 17:49 UTCEPSS rescore
  9. 2026-06-15 17:44 UTCEPSS rescore
  10. 2026-06-14 23:14 UTCEPSS rescore
  11. 2026-06-14 23:14 UTCEPSS rescore
  12. 2026-06-13 22:57 UTCEPSS rescore
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  14. 2026-06-12 23:08 UTCEPSS rescore
  15. 2026-06-11 13:56 UTCEPSS rescore
  16. 2026-06-10 22:14 UTCEPSS rescore
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  18. 2026-06-08 14:14 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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  24. 2026-06-05 22:44 UTCEPSS rescore
  25. 2026-06-05 06:08 UTCEPSS rescore
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  27. 2026-06-04 13:09 UTCEPSS rescore
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  29. 2026-06-02 20:10 UTCEPSS rescore
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  31. 2026-06-01 13:49 UTCEPSS rescore
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  35. 2026-05-31 00:14 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 04:29 UTCEG score recompute
  40. 2026-05-29 04:29 UTCVendor advisory
  41. 2026-05-29 04:29 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

Related CVEs(same vendor)

Frequently asked(4)

What is CVE-2011-2521?
CVE-2011-2521 is a none vulnerability published on May 24, 2012. The x86assignhwevent function in arch/x86/kernel/cpu/perfevent.c in the Performance Events subsystem in the Linux kernel before 2.6.39 does not properly calculate counter values, which allows local users to cause a denial of service (panic) via the perf program.
When was CVE-2011-2521 disclosed?
CVE-2011-2521 was first published in the National Vulnerability Database on May 24, 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-2011-2521 actively exploited?
CVE-2011-2521 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2011-2521?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-2521, 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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