FKIE_CVE-2021-47416
Vulnerability from fkie_nvd - Published: 2024-05-21 15:15 - Updated: 2026-06-17 04:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved:
phy: mdio: fix memory leak
Syzbot reported memory leak in MDIO bus interface, the problem was in
wrong state logic.
MDIOBUS_ALLOCATED indicates 2 states:
1. Bus is only allocated
2. Bus allocated and __mdiobus_register() fails, but
device_register() was called
In case of device_register() has been called we should call put_device()
to correctly free the memory allocated for this device, but mdiobus_free()
calls just kfree(dev) in case of MDIOBUS_ALLOCATED state
To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED
_before_ calling device_register(), because put_device() should be
called even in case of device_register() failure.
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 | 5.15 | |
| linux | linux_kernel | 5.15 | |
| linux | linux_kernel | 5.15 | |
| linux | linux_kernel | 5.15 |
{
"affected": [
{
"affectedData": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"drivers/net/phy/mdio_bus.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "25e9f88c7e3cc35f5e3d3db199660d28a15df639",
"status": "affected",
"version": "46abc02175b3c246dd5141d878f565a8725060c9",
"versionType": "git"
},
{
"lessThan": "2250392d930bd0d989f24d355d6355b0150256e7",
"status": "affected",
"version": "46abc02175b3c246dd5141d878f565a8725060c9",
"versionType": "git"
},
{
"lessThan": "f4f502a04ee1e543825af78f47eb7785015cd9f6",
"status": "affected",
"version": "46abc02175b3c246dd5141d878f565a8725060c9",
"versionType": "git"
},
{
"lessThan": "2397b9e118721292429fea8807a698e71b94795f",
"status": "affected",
"version": "46abc02175b3c246dd5141d878f565a8725060c9",
"versionType": "git"
},
{
"lessThan": "414bb4ead1362ef2c8592db723c017258f213988",
"status": "affected",
"version": "46abc02175b3c246dd5141d878f565a8725060c9",
"versionType": "git"
},
{
"lessThan": "0d2dd40a7be61b89a7c99dae8ee96389d27b413a",
"status": "affected",
"version": "46abc02175b3c246dd5141d878f565a8725060c9",
"versionType": "git"
},
{
"lessThan": "064c2616234a7394867c924b5c1303974f3a4f4d",
"status": "affected",
"version": "46abc02175b3c246dd5141d878f565a8725060c9",
"versionType": "git"
},
{
"lessThan": "ca6e11c337daf7925ff8a2aac8e84490a8691905",
"status": "affected",
"version": "46abc02175b3c246dd5141d878f565a8725060c9",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/net/phy/mdio_bus.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.28"
},
{
"lessThan": "2.6.28",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.4.*",
"status": "unaffected",
"version": "4.4.289",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.9.*",
"status": "unaffected",
"version": "4.9.287",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.14.*",
"status": "unaffected",
"version": "4.14.251",
"versionType": "semver"
},
{
"lessThanOrEqual": "4.19.*",
"status": "unaffected",
"version": "4.19.211",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.4.*",
"status": "unaffected",
"version": "5.4.153",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.73",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.14.*",
"status": "unaffected",
"version": "5.14.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.15",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
{
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"matchCriteriaId": "D95AA5F2-2A38-4D42-BCE3-11D4CDA29078",
"versionEndExcluding": "4.4.289",
"versionStartIncluding": "2.6.28",
"vulnerable": true
},
{
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},
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{
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},
{
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"matchCriteriaId": "AF55383D-4DF2-45DC-93F7-571F4F978EAB",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nphy: mdio: fix memory leak\n\nSyzbot reported memory leak in MDIO bus interface, the problem was in\nwrong state logic.\n\nMDIOBUS_ALLOCATED indicates 2 states:\n\t1. Bus is only allocated\n\t2. Bus allocated and __mdiobus_register() fails, but\n\t device_register() was called\n\nIn case of device_register() has been called we should call put_device()\nto correctly free the memory allocated for this device, but mdiobus_free()\ncalls just kfree(dev) in case of MDIOBUS_ALLOCATED state\n\nTo avoid this behaviour we need to set bus-\u003estate to MDIOBUS_UNREGISTERED\n_before_ calling device_register(), because put_device() should be\ncalled even in case of device_register() failure."
},
{
"lang": "es",
"value": " En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: phy: mdio: arreglar p\u00e9rdida de memoria. Syzbot inform\u00f3 una p\u00e9rdida de memoria en la interfaz del bus MDIO, el problema estaba en una l\u00f3gica de estado incorrecta. MDIOBUS_ALLOCATED indica 2 estados: 1. El bus solo est\u00e1 asignado 2. El bus asignado y __mdiobus_register() falla, pero se llam\u00f3 a device_register() En caso de que se haya llamado a device_register() debemos llamar a put_device() para liberar correctamente la memoria asignada para esto dispositivo, pero mdiobus_free() llama solo a kfree(dev) en caso de estado MDIOBUS_ALLOCATED. Para evitar este comportamiento, necesitamos configurar bus-\u0026gt;state en MDIOBUS_UNREGISTERED _antes_ de llamar a device_register(), porque put_device() debe llamarse incluso en caso de fallo de device_register( ."
}
],
"id": "CVE-2021-47416",
"lastModified": "2026-06-17T04:17:25.337",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 5.5,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
"id": "CVE-2021-47416",
"options": [
{
"exploitation": "none"
},
{
"automatable": "no"
},
{
"technicalImpact": "partial"
}
],
"role": "CISA Coordinator",
"timestamp": "2024-05-21T17:32:44.904318Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-05-21T15:15:27.083",
"references": [
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"vulnStatus": "Analyzed",
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{
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"value": "CWE-401"
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],
"source": "nvd@nist.gov",
"type": "Primary"
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]
}
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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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