CVE-2021-46940 (GCVE-0-2021-46940)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:40 – Updated: 2026-05-11 13:44
VLAI
Title
tools/power turbostat: Fix offset overflow issue in index converting
Summary
In the Linux kernel, the following vulnerability has been resolved: tools/power turbostat: Fix offset overflow issue in index converting The idx_to_offset() function returns type int (32-bit signed), but MSR_PKG_ENERGY_STAT is u32 and would be interpreted as a negative number. The end result is that it hits the if (offset < 0) check in update_msr_sum() which prevents the timer callback from updating the stat in the background when long durations are used. The similar issue exists in offset_to_idx() and update_msr_sum(). Fix this issue by converting the 'int' to 'off_t' accordingly.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9972d5d84d76982606806b2ce887f70c2f8ba60a , < ea6803ff2cd1a2d7d880256bf562172b708a76ff (git)
Affected: 9972d5d84d76982606806b2ce887f70c2f8ba60a , < dbdf22fc825fdb1d97f23230064e0f9819471628 (git)
Affected: 9972d5d84d76982606806b2ce887f70c2f8ba60a , < 337b1546cde87fb8588ddaedf0201b769baa572a (git)
Affected: 9972d5d84d76982606806b2ce887f70c2f8ba60a , < 13a779de4175df602366d129e41782ad7168cef0 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.36 , ≤ 5.10.* (semver)
Unaffected: 5.11.20 , ≤ 5.11.* (semver)
Unaffected: 5.12.3 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ea6803ff2cd1a2d7d880256bf562172b708a76ff\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/dbdf22fc825fdb1d97f23230064e0f9819471628\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/337b1546cde87fb8588ddaedf0201b769baa572a\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/13a779de4175df602366d129e41782ad7168cef0\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:17:42.991Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-46940\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-03-05T20:11:09.167869Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-07-05T15:20:37.872Z\"}}], \"cna\": {\"title\": \"tools/power turbostat: Fix offset overflow issue in index converting\", \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"9972d5d84d76982606806b2ce887f70c2f8ba60a\", \"lessThan\": \"ea6803ff2cd1a2d7d880256bf562172b708a76ff\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9972d5d84d76982606806b2ce887f70c2f8ba60a\", \"lessThan\": \"dbdf22fc825fdb1d97f23230064e0f9819471628\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9972d5d84d76982606806b2ce887f70c2f8ba60a\", \"lessThan\": \"337b1546cde87fb8588ddaedf0201b769baa572a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"9972d5d84d76982606806b2ce887f70c2f8ba60a\", \"lessThan\": \"13a779de4175df602366d129e41782ad7168cef0\", \"versionType\": \"git\"}], \"programFiles\": [\"tools/power/x86/turbostat/turbostat.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.10\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.36\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.20\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.3\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"tools/power/x86/turbostat/turbostat.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/ea6803ff2cd1a2d7d880256bf562172b708a76ff\"}, {\"url\": \"https://git.kernel.org/stable/c/dbdf22fc825fdb1d97f23230064e0f9819471628\"}, {\"url\": \"https://git.kernel.org/stable/c/337b1546cde87fb8588ddaedf0201b769baa572a\"}, {\"url\": \"https://git.kernel.org/stable/c/13a779de4175df602366d129e41782ad7168cef0\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ntools/power turbostat: Fix offset overflow issue in index converting\\n\\nThe idx_to_offset() function returns type int (32-bit signed), but\\nMSR_PKG_ENERGY_STAT is u32 and would be interpreted as a negative number.\\nThe end result is that it hits the if (offset \u003c 0) check in update_msr_sum()\\nwhich prevents the timer callback from updating the stat in the background when\\nlong durations are used. The similar issue exists in offset_to_idx() and\\nupdate_msr_sum(). Fix this issue by converting the \u0027int\u0027 to \u0027off_t\u0027 accordingly.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.36\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.20\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.3\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T13:44:51.013Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46940\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T13:44:51.013Z\", \"dateReserved\": \"2024-02-25T13:45:52.721Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:40:28.063Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.