FKIE_CVE-2021-46966
Vulnerability from fkie_nvd - Published: 2024-02-27 19:04 - Updated: 2026-06-17 04:16
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_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/acpi/custom_method.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"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"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "54A3D99C-739B-406F-AF5B-ABFF201FD7EA",
"versionEndExcluding": "4.4.269",
"versionStartIncluding": "4.4.195",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "40842990-645D-419D-851F-07328ECC681E",
"versionEndExcluding": "4.9.269",
"versionStartIncluding": "4.9.195",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "06219DEF-0B7F-4D93-9878-9DC640945517",
"versionEndExcluding": "4.14.233",
"versionStartIncluding": "4.14.147",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "3E80ED24-F781-449F-8035-CBA0FB5C6691",
"versionEndExcluding": "4.19.191",
"versionStartIncluding": "4.19.77",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "45C90F78-15A8-452F-AA7D-00A762FDEFE7",
"versionEndExcluding": "5.4.118",
"versionStartIncluding": "5.4",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "003E22D0-CA29-4338-8B35-0754C740074F",
"versionEndExcluding": "5.10.36",
"versionStartIncluding": "5.5",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "EEC03413-9760-46D4-AC1D-EB084A1D4111",
"versionEndExcluding": "5.11.20",
"versionStartIncluding": "5.11",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "F9D6B2DE-7E4A-4B3B-9AEE-3A2C5F23DA32",
"versionEndExcluding": "5.12.3",
"versionStartIncluding": "5.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"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."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ACPI: custom_method: soluciona un posible problema de use-after-free En cm_write(), buf siempre se libera al llegar al final de la funci\u00f3n. Si el recuento solicitado es menor que table.length, el b\u00fafer asignado se liberar\u00e1, pero las llamadas posteriores a cm_write() seguir\u00e1n intentando acceder a \u00e9l. Elimine el kfree(buf) incondicional al final de la funci\u00f3n y establezca el buf en NULL en la ruta de error -EINVAL para que coincida con el resto de la funci\u00f3n."
}
],
"id": "CVE-2021-46966",
"lastModified": "2026-06-17T04:16:00.870",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-46966",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-06-28T17:00:55.492289Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-02-27T19:04:07.127",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/1d53ca5d131074c925ce38361fb0376d3bf7e394"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/62dc2440ebb552aa0d7f635e1697e077d9d21203"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/72814a94c38a33239793f7622cec6ace1e540c4b"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/8b04d57f30caf76649d0567551589af9a66ca9be"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/90575d1d9311b753cf1718f4ce9061ddda7dfd23"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/a5b26a2e362f572d87e9fd35435680e557052a17"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/b7a5baaae212a686ceb812c32fceed79c03c0234"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/e483bb9a991bdae29a0caa4b3a6d002c968f94aa"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/f16737caf41fc06cfe6e49048becb09657074d4b"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
Loading…
Loading…
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.
Loading…
Loading…
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.
Loading…
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.
Loading…