CVE-2021-46966 (GCVE-0-2021-46966)

Vulnerability from cvelistv5 – Published: 2024-02-27 18:47 – Updated: 2025-05-04 12:40
VLAI?
Title
ACPI: custom_method: fix potential use-after-free issue
Summary
In the Linux kernel, the following vulnerability has been resolved: ACPI: custom_method: fix potential use-after-free issue In cm_write(), buf is always freed when reaching the end of the function. If the requested count is less than table.length, the allocated buffer will be freed but subsequent calls to cm_write() will still try to access it. Remove the unconditional kfree(buf) at the end of the function and set the buf to NULL in the -EINVAL error path to match the rest of function.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4bda2b79a9d04c8ba31681c66e95877dbb433416 , < 1d53ca5d131074c925ce38361fb0376d3bf7e394 (git)
Affected: 5c12dadcbef8cd55ef1f5dac799bfcbb7ea7db1d , < 8b04d57f30caf76649d0567551589af9a66ca9be (git)
Affected: 35b88a10535edcf62d3e6b7893a8cd506ff98a24 , < 90575d1d9311b753cf1718f4ce9061ddda7dfd23 (git)
Affected: e4467fb6ef547aa352dc03397f9474ec84eced5b , < a5b26a2e362f572d87e9fd35435680e557052a17 (git)
Affected: 03d1571d9513369c17e6848476763ebbd10ec2cb , < 72814a94c38a33239793f7622cec6ace1e540c4b (git)
Affected: 03d1571d9513369c17e6848476763ebbd10ec2cb , < 62dc2440ebb552aa0d7f635e1697e077d9d21203 (git)
Affected: 03d1571d9513369c17e6848476763ebbd10ec2cb , < f16737caf41fc06cfe6e49048becb09657074d4b (git)
Affected: 03d1571d9513369c17e6848476763ebbd10ec2cb , < b7a5baaae212a686ceb812c32fceed79c03c0234 (git)
Affected: 03d1571d9513369c17e6848476763ebbd10ec2cb , < e483bb9a991bdae29a0caa4b3a6d002c968f94aa (git)
Affected: 70424999fbf1f160ade111cb9baab51776e0f9c2 (git)
Affected: 06cd4a06eb596a888239fb8ceb6ea15677cab396 (git)
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    Linux Linux Affected: 5.4
Unaffected: 0 , < 5.4 (semver)
Unaffected: 4.4.269 , ≤ 4.4.* (semver)
Unaffected: 4.9.269 , ≤ 4.9.* (semver)
Unaffected: 4.14.233 , ≤ 4.14.* (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.118 , ≤ 5.4.* (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)
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\"https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203\"}, {\"url\": \"https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b\"}, {\"url\": \"https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234\"}, {\"url\": \"https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nACPI: custom_method: fix potential use-after-free issue\\n\\nIn cm_write(), buf is always freed when reaching the end of the\\nfunction.  If the requested count is less than table.length, the\\nallocated buffer will be freed but subsequent calls to cm_write() will\\nstill try to access it.\\n\\nRemove the unconditional kfree(buf) at the end of the function and\\nset the buf to NULL in the -EINVAL error path to match the rest of\\nfunction.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.269\", \"versionStartIncluding\": \"4.4.195\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.269\", \"versionStartIncluding\": \"4.9.195\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.233\", \"versionStartIncluding\": \"4.14.147\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.19.77\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.118\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.36\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.20\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.3\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.4\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.2.19\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.3.4\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:40:40.314Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46966\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:40:40.314Z\", \"dateReserved\": \"2024-02-27T18:42:55.943Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-27T18:47:03.631Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.