FKIE_CVE-2021-47232
Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-08-04 10:16
Severity
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
8.4 (High) - CVSS:3.1/
Summary
In the Linux kernel, the following vulnerability has been resolved:
can: j1939: fix Use-after-Free, hold skb ref while in use
This patch fixes a Use-after-Free found by the syzbot.
The problem is that a skb is taken from the per-session skb queue,
without incrementing the ref count. This leads to a Use-after-Free if
the skb is taken concurrently from the session queue due to a CTS.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 | |
| linux | linux_kernel | 5.13 |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/can/j1939/transport.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "22cba878abf646cd3a02ee7c8c2cef7afe66a256",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
"lessThan": "509ab6bfdd0c76daebbad0f0af07da712116de22",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
"lessThan": "1071065eeb33d32b7d98c2ce7591881ae7381705",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
},
{
"lessThan": "2030043e616cab40f510299f09b636285e0a3678",
"status": "affected",
"version": "9d71dd0c70099914fcd063135da3c580865e924c",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/can/j1939/transport.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": "5.4.*",
"status": "unaffected",
"version": "5.4.128",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.46",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.13",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
},
{
"affectedData": [
{
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"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "22cba878abf6 ",
"status": "affected",
"version": "9d71dd0c7009",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": " 509ab6bfdd0c ",
"status": "affected",
"version": "9d71dd0c7009",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "1071065eeb33 ",
"status": "affected",
"version": "9d71dd0c7009",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "2030043e616c ",
"status": "affected",
"version": "9d71dd0c7009",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "5.5",
"status": "unaffected",
"version": "5.4.128",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "5.11",
"status": "unaffected",
"version": " 5.10.46",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
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"status": "unaffected",
"version": "5.12.13",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"status": "unaffected",
"version": "5.13"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"lessThan": "5.4",
"status": "unaffected",
"version": "0",
"versionType": "custom"
}
]
},
{
"cpes": [
"cpe:2.3:o:linux:linux_kernel:5.4:-:*:*:*:*:*:*"
],
"defaultStatus": "unknown",
"product": "linux_kernel",
"vendor": "linux",
"versions": [
{
"status": "affected",
"version": "5.4"
}
]
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "8C2A72CA-7A16-4ACC-8D7D-6132A9D8B054",
"versionEndExcluding": "5.4.128",
"versionStartIncluding": "5.4",
"vulnerable": true
},
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{
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: j1939: fix Use-after-Free, hold skb ref while in use\n\nThis patch fixes a Use-after-Free found by the syzbot.\n\nThe problem is that a skb is taken from the per-session skb queue,\nwithout incrementing the ref count. This leads to a Use-after-Free if\nthe skb is taken concurrently from the session queue due to a CTS."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: can: j1939: corrige Use-after-Free, mantenga presionada la referencia skb mientras est\u00e1 en uso. Este parche corrige un Use-after-Free encontrado por syzbot. El problema es que se toma un skb de la cola de skb por sesi\u00f3n, sin incrementar el recuento de referencias. Esto conduce a un use after free si el skb se toma simult\u00e1neamente de la cola de sesi\u00f3n debido a un CTS."
}
],
"id": "CVE-2021-47232",
"lastModified": "2026-08-04T10:16:53.793",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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},
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"type": "Secondary"
},
{
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"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
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}
],
"ssvcV203": [
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"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-05-28T19:03:26.982947Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-05-21T15:15:12.557",
"references": [
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
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{
"lang": "en",
"value": "CWE-416"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
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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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