CVE-2021-46966 (GCVE-0-2021-46966)
Vulnerability from cvelistv5 – Published: 2024-02-27 18:47 – Updated: 2026-05-23 15:18
VLAI
EPSS
VEX
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.
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-28 17:00 UTC
Assigner
References
9 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) Affected: 4.4.195 , < 4.4.269 (semver) Affected: 4.9.195 , < 4.9.269 (semver) Affected: 4.14.147 , < 4.14.233 (semver) Affected: 4.19.77 , < 4.19.191 (semver) Affected: 5.2.19 , < 5.3 (semver) Affected: 5.3.4 , < 5.4 (semver) |
guessed | |
| 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) |
guessed |
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"lessThan": "1d53ca5d131074c925ce38361fb0376d3bf7e394",
"status": "affected",
"version": "4bda2b79a9d04c8ba31681c66e95877dbb433416",
"versionType": "git"
},
{
"lessThan": "8b04d57f30caf76649d0567551589af9a66ca9be",
"status": "affected",
"version": "5c12dadcbef8cd55ef1f5dac799bfcbb7ea7db1d",
"versionType": "git"
},
{
"lessThan": "90575d1d9311b753cf1718f4ce9061ddda7dfd23",
"status": "affected",
"version": "35b88a10535edcf62d3e6b7893a8cd506ff98a24",
"versionType": "git"
},
{
"lessThan": "a5b26a2e362f572d87e9fd35435680e557052a17",
"status": "affected",
"version": "e4467fb6ef547aa352dc03397f9474ec84eced5b",
"versionType": "git"
},
{
"lessThan": "72814a94c38a33239793f7622cec6ace1e540c4b",
"status": "affected",
"version": "03d1571d9513369c17e6848476763ebbd10ec2cb",
"versionType": "git"
},
{
"lessThan": "62dc2440ebb552aa0d7f635e1697e077d9d21203",
"status": "affected",
"version": "03d1571d9513369c17e6848476763ebbd10ec2cb",
"versionType": "git"
},
{
"lessThan": "f16737caf41fc06cfe6e49048becb09657074d4b",
"status": "affected",
"version": "03d1571d9513369c17e6848476763ebbd10ec2cb",
"versionType": "git"
},
{
"lessThan": "b7a5baaae212a686ceb812c32fceed79c03c0234",
"status": "affected",
"version": "03d1571d9513369c17e6848476763ebbd10ec2cb",
"versionType": "git"
},
{
"lessThan": "e483bb9a991bdae29a0caa4b3a6d002c968f94aa",
"status": "affected",
"version": "03d1571d9513369c17e6848476763ebbd10ec2cb",
"versionType": "git"
},
{
"status": "affected",
"version": "70424999fbf1f160ade111cb9baab51776e0f9c2",
"versionType": "git"
},
{
"status": "affected",
"version": "06cd4a06eb596a888239fb8ceb6ea15677cab396",
"versionType": "git"
},
{
"lessThan": "4.4.269",
"status": "affected",
"version": "4.4.195",
"versionType": "semver"
},
{
"lessThan": "4.9.269",
"status": "affected",
"version": "4.9.195",
"versionType": "semver"
},
{
"lessThan": "4.14.233",
"status": "affected",
"version": "4.14.147",
"versionType": "semver"
},
{
"lessThan": "4.19.191",
"status": "affected",
"version": "4.19.77",
"versionType": "semver"
},
{
"lessThan": "5.3",
"status": "affected",
"version": "5.2.19",
"versionType": "semver"
},
{
"lessThan": "5.4",
"status": "affected",
"version": "5.3.4",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/acpi/custom_method.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.4"
},
{
"lessThan": "5.4",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.269",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.233",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.118",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.36",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.11.*",
"status": "unaffected",
"version": "5.11.20",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.3",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.4.269",
"versionStartIncluding": "4.4.195",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.9.269",
"versionStartIncluding": "4.9.195",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.14.233",
"versionStartIncluding": "4.14.147",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "4.19.191",
"versionStartIncluding": "4.19.77",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.118",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.36",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.11.20",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.12.3",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.13",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.2.19",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "5.3.4",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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."
}
],
"providerMetadata": {
"dateUpdated": "2026-05-23T15:18:48.670Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394"
},
{
"url": "https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be"
},
{
"url": "https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23"
},
{
"url": "https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17"
},
{
"url": "https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b"
},
{
"url": "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"
}
],
"title": "ACPI: custom_method: fix potential use-after-free issue",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2021-46966",
"datePublished": "2024-02-27T18:47:03.631Z",
"dateReserved": "2024-02-27T18:42:55.943Z",
"dateUpdated": "2026-05-23T15:18:48.670Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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