CVE-2009-1242

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 vmx_set_msr function in arch/x86/kvm/vmx.c in the VMX implementation in the KVM subsystem in the Linux kernel before 2.6.29.1 on the i386 platform allows guest OS users to cause a denial of service (OOPS) by setting the EFER_LME (aka "Long mode enable") bit in the Extended Feature Enable Register (EFER) model-specific register, which is specific to the x86_64 platform.

CVSS v3
—
EG Score
0.0(none)
EPSS
37.5%
KEV
Not listed

Published

April 6, 2009

Last Modified

April 23, 2026

References (54)

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-image-2.6.28-13-server (2.6.28-13.45) @ jaunty2026-05-30ubuntu

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.

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 42× 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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  11. 2026-06-28 14:03 UTCEPSS rescore
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  14. 2026-06-27 03:05 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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  7. 2026-06-16 17:49 UTCEPSS rescore
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  9. 2026-06-15 17:44 UTCEPSS rescore
  10. 2026-06-14 23:14 UTCEPSS rescore
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  12. 2026-06-13 22:57 UTCEPSS rescore
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  20. 2026-06-06 13:44 UTCEPSS rescore
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  22. 2026-06-06 13:44 UTCEPSS rescore
  23. 2026-06-05 22:44 UTCEPSS rescore
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  25. 2026-06-05 06:07 UTCEPSS rescore
  26. 2026-06-04 13:09 UTCEPSS rescore
  27. 2026-06-04 13:09 UTCEPSS rescore
  28. 2026-06-02 20:10 UTCEPSS rescore
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  30. 2026-06-01 13:49 UTCEPSS rescore
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  32. 2026-05-31 22:28 UTCEPSS rescore
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  34. 2026-05-31 00:13 UTCEPSS rescore
  35. 2026-05-31 00:13 UTCEPSS rescore
  36. 2026-05-30 17:24 UTCEG score recompute
  37. 2026-05-30 17:24 UTCVendor advisory
  38. 2026-05-30 17:24 UTCGHSA enrichment
  39. 2026-05-29 13:40 UTCEPSS rescore
  40. 2026-05-28 13:42 UTCEPSS rescore
  41. 2026-05-28 13:42 UTCEPSS rescore
  42. 2026-05-28 13:42 UTCEPSS rescore
  43. 2026-05-27 13:38 UTCEPSS rescore
  44. 2026-05-27 13:38 UTCEPSS rescore
  45. 2026-05-26 13:41 UTCEPSS rescore
  46. 2026-05-26 13:41 UTCEPSS rescore
  47. 2026-05-26 07:16 UTCEPSS rescore
  48. 2026-05-26 07:16 UTCEPSS rescore
  49. 2026-05-24 16:43 UTCEPSS rescore
  50. 2026-05-22 21:15 UTCEPSS rescore
  51. 2026-05-22 21:15 UTCEPSS rescore
  52. 2026-05-20 22:37 UTCEPSS rescore
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  54. 2026-05-20 11:21 UTCEPSS rescore
  55. 2026-05-20 11:20 UTCEPSS rescore
  56. 2026-05-18 21:29 UTCEPSS rescore

Related CVEs(same vendor + same CWE)

Frequently asked(4)

What is CVE-2009-1242?
CVE-2009-1242 is a none vulnerability published on April 6, 2009. The vmxsetmsr function in arch/x86/kvm/vmx.c in the VMX implementation in the KVM subsystem in the Linux kernel before 2.6.29.1 on the i386 platform allows guest OS users to cause a denial of service (OOPS) by setting the EFERLME (aka "Long mode enable") bit in the Extended Feature Enable Register…
When was CVE-2009-1242 disclosed?
CVE-2009-1242 was first published in the National Vulnerability Database on April 6, 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-2009-1242 actively exploited?
CVE-2009-1242 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 37.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2009-1242?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2009-1242, 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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