CVE-2021-46966 (GCVE-0-2021-46966)
Vulnerability from cvelistv5
Published
2024-02-27 18:47
Modified
2025-05-04 12:40
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 4bda2b79a9d04c8ba31681c66e95877dbb433416
Version: 5c12dadcbef8cd55ef1f5dac799bfcbb7ea7db1d
Version: 35b88a10535edcf62d3e6b7893a8cd506ff98a24
Version: e4467fb6ef547aa352dc03397f9474ec84eced5b
Version: 03d1571d9513369c17e6848476763ebbd10ec2cb
Version: 03d1571d9513369c17e6848476763ebbd10ec2cb
Version: 03d1571d9513369c17e6848476763ebbd10ec2cb
Version: 03d1571d9513369c17e6848476763ebbd10ec2cb
Version: 03d1571d9513369c17e6848476763ebbd10ec2cb
Version: 70424999fbf1f160ade111cb9baab51776e0f9c2
Version: 06cd4a06eb596a888239fb8ceb6ea15677cab396
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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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