FKIE_CVE-2021-47239
Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-06-17 04:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: usb: fix possible use-after-free in smsc75xx_bind
The commit 46a8b29c6306 ("net: usb: fix memory leak in smsc75xx_bind")
fails to clean up the work scheduled in smsc75xx_reset->
smsc75xx_set_multicast, which leads to use-after-free if the work is
scheduled to start after the deallocation. In addition, this patch
also removes a dangling pointer - dev->data[0].
This patch calls cancel_work_sync to cancel the scheduled work and set
the dangling pointer to NULL.
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 | * |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/usb/smsc75xx.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "7cc8b2e05fcea6edd022d26e82091d781af8fd9b",
"status": "affected",
"version": "200dbfcad8011e50c3cec269ed7b980836eeb1fa",
"versionType": "git"
},
{
"lessThan": "64160d1741a3de5204d1a822e058e0b4cc526504",
"status": "affected",
"version": "22c840596af0c09068b6cf948616e6496e59e07f",
"versionType": "git"
},
{
"lessThan": "c4e3be2e7742863e454ce31faf8fd0109c00050b",
"status": "affected",
"version": "9e6b8c1ff9d997e1fa16cbd2d60739adf6dc1bbc",
"versionType": "git"
},
{
"lessThan": "2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b",
"status": "affected",
"version": "9e6a3eccb28779710cbbafc4f4258d92509c6d07",
"versionType": "git"
},
{
"lessThan": "4252bf6c2b245f47011098113d405ffad6ad5d5b",
"status": "affected",
"version": "b95fb96e6339e34694dd578fb6bde3575b01af17",
"versionType": "git"
},
{
"lessThan": "570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb",
"status": "affected",
"version": "635ac38b36255d3cfb8312cf7c471334f4d537e0",
"versionType": "git"
},
{
"lessThan": "14616c372a7be01a2fb8c56c9d8debd232b9e43d",
"status": "affected",
"version": "70c886ac93f87ae7214a0c69151a28a8075dd95b",
"versionType": "git"
},
{
"lessThan": "56b786d86694e079d8aad9b314e015cd4ac02a3d",
"status": "affected",
"version": "46a8b29c6306d8bbfd92b614ef65a47c900d8e70",
"versionType": "git"
}
]
},
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/usb/smsc75xx.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "4.4.274",
"status": "affected",
"version": "4.4.271",
"versionType": "semver"
},
{
"lessThan": "4.9.274",
"status": "affected",
"version": "4.9.271",
"versionType": "semver"
},
{
"lessThan": "4.14.238",
"status": "affected",
"version": "4.14.235",
"versionType": "semver"
},
{
"lessThan": "4.19.196",
"status": "affected",
"version": "4.19.193",
"versionType": "semver"
},
{
"lessThan": "5.4.128",
"status": "affected",
"version": "5.4.124",
"versionType": "semver"
},
{
"lessThan": "5.10.46",
"status": "affected",
"version": "5.10.42",
"versionType": "semver"
},
{
"lessThan": "5.12.13",
"status": "affected",
"version": "5.12.9",
"versionType": "semver"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "737AAC58-BB4E-47DF-AC5F-FA6F3A7A1103",
"versionEndExcluding": "4.4.274",
"versionStartIncluding": "4.4.271",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "8C445B8A-4E12-47FB-8627-E8B96B9579D0",
"versionEndExcluding": "4.9.274",
"versionStartIncluding": "4.9.271",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "BCBDE75C-DF50-4E70-B1D1-A20BD3099318",
"versionEndExcluding": "4.14.238",
"versionStartIncluding": "4.14.235",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "E6000807-8020-4E7C-A445-BAF2F14A52A1",
"versionEndExcluding": "4.19.196",
"versionStartIncluding": "4.19.193",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "6DBC83E0-6B98-400C-9F10-299D808706FB",
"versionEndExcluding": "5.4.128",
"versionStartIncluding": "5.4.124",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "F9F66318-6AFC-40FF-A36E-F936221016D7",
"versionEndExcluding": "5.10.46",
"versionStartIncluding": "5.10.42",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"matchCriteriaId": "7AA02305-D22E-49CF-8F2A-272D97B16E7C",
"versionEndExcluding": "5.12.13",
"versionStartIncluding": "5.12.9",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: usb: fix possible use-after-free in smsc75xx_bind\n\nThe commit 46a8b29c6306 (\"net: usb: fix memory leak in smsc75xx_bind\")\nfails to clean up the work scheduled in smsc75xx_reset-\u003e\nsmsc75xx_set_multicast, which leads to use-after-free if the work is\nscheduled to start after the deallocation. In addition, this patch\nalso removes a dangling pointer - dev-\u003edata[0].\n\nThis patch calls cancel_work_sync to cancel the scheduled work and set\nthe dangling pointer to NULL."
},
{
"lang": "es",
"value": " En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net:usb: corrige posible use after free en smsc75xx_bind. La confirmaci\u00f3n 46a8b29c6306 (\"net:usb: corrige la p\u00e9rdida de memoria en smsc75xx_bind\") no logra limpiar el trabajo programado en smsc75xx_reset -\u0026gt; smsc75xx_set_multicast, lo que genera use after free si el trabajo est\u00e1 programado para comenzar despu\u00e9s de la desasignaci\u00f3n. Adem\u00e1s, este parche tambi\u00e9n elimina un puntero colgante: dev-\u0026gt;data[0]. Este parche llama a cancel_work_sync para cancelar el trabajo programado y establecer el puntero colgante en NULL."
}
],
"id": "CVE-2021-47239",
"lastModified": "2026-06-17T04:16:59.147",
"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-2021-47239",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-09-10T15:40:00.710972Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-05-21T15:15:13.100",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3d"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/7cc8b2e05fcea6edd022d26e82091d781af8fd9b"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050b"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/14616c372a7be01a2fb8c56c9d8debd232b9e43d"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/2fc8300c9cfa5167fcb5b1a2a07db6f53e82f59b"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/4252bf6c2b245f47011098113d405ffad6ad5d5b"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/56b786d86694e079d8aad9b314e015cd4ac02a3d"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/570a52cf3e01d19f7fd1a251dfc52b0cd86c13cb"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/64160d1741a3de5204d1a822e058e0b4cc526504"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/7cc8b2e05fcea6edd022d26e82091d781af8fd9b"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/c4e3be2e7742863e454ce31faf8fd0109c00050b"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
Loading…
Loading…
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
Loading timeline…
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.