FKIE_CVE-2021-47055
Vulnerability from fkie_nvd - Published: 2024-02-29 23:15 - Updated: 2026-08-04 10:16
Severity
7.1 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/
Summary
In the Linux kernel, the following vulnerability has been resolved:
mtd: require write permissions for locking and badblock ioctls
MEMLOCK, MEMUNLOCK and OTPLOCK modify protection bits. Thus require
write permission. Depending on the hardware MEMLOCK might even be
write-once, e.g. for SPI-NOR flashes with their WP# tied to GND. OTPLOCK
is always write-once.
MEMSETBADBLOCK modifies the bad block table.
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/mtd/mtdchar.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "1c9f9125892a43901438bf704ada6b7019e2a884",
"versionType": "git"
},
{
"lessThan": "9625b00cac6630479c0ff4b9fafa88bee636e1f0",
"status": "affected",
"version": "583d42400532fbd6228b0254d7c732b771e4750d",
"versionType": "git"
},
{
"lessThan": "f73b29819c6314c0ba8b7d5892dfb03487424bee",
"status": "affected",
"version": "389c74c218d3b182e9cd767e98cee0e0fd0dabaa",
"versionType": "git"
},
{
"lessThan": "75ed985bd6c8ac1d4e673e93ea9d96c9908c1d37",
"status": "affected",
"version": "ab1a602a9cea98aa37b2e6851b168d2a2633a58d",
"versionType": "git"
},
{
"lessThan": "5880afefe0cb9b2d5e801816acd58bfe91a96981",
"status": "affected",
"version": "9a53e8bd59d9f070505e51d3fd19606a270e6b93",
"versionType": "git"
},
{
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"status": "affected",
"version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3",
"versionType": "git"
},
{
"lessThan": "077259f5e777c3c8821f6b41dee709fcda27306b",
"status": "affected",
"version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3",
"versionType": "git"
},
{
"lessThan": "a08799d3e8c8088640956237c183f83463c39668",
"status": "affected",
"version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3",
"versionType": "git"
},
{
"lessThan": "1e97743fd180981bef5f01402342bb54bf1c6366",
"status": "affected",
"version": "f7e6b19bc76471ba03725fe58e0c218a3d6266c3",
"versionType": "git"
},
{
"status": "affected",
"version": "36a8b2f49235e63ab3f901fe12e1b6732f075c2e",
"versionType": "git"
},
{
"status": "affected",
"version": "eb3d82abc335624a5e8ecfb75aba0b684e2dc4db",
"versionType": "git"
},
{
"lessThan": "4.4.269",
"status": "affected",
"version": "4.4.233",
"versionType": "semver"
},
{
"lessThan": "4.9.269",
"status": "affected",
"version": "4.9.233",
"versionType": "semver"
},
{
"lessThan": "4.14.233",
"status": "affected",
"version": "4.14.194",
"versionType": "semver"
},
{
"lessThan": "4.19.191",
"status": "affected",
"version": "4.19.139",
"versionType": "semver"
},
{
"lessThan": "5.4.119",
"status": "affected",
"version": "5.4.58",
"versionType": "semver"
},
{
"lessThan": "5.8",
"status": "affected",
"version": "5.7.15",
"versionType": "semver"
},
{
"lessThan": "5.9",
"status": "affected",
"version": "5.8.1",
"versionType": "semver"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"drivers/mtd/mtdchar.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "5.9"
},
{
"lessThan": "5.9",
"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": "5.4.119",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.37",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.11.*",
"status": "unaffected",
"version": "5.11.21",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.12.*",
"status": "unaffected",
"version": "5.12.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "5.13",
"versionType": "original_commit_for_fix"
}
]
}
],
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}
],
"configurations": [
{
"nodes": [
{
"cpeMatch": [
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],
"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmtd: require write permissions for locking and badblock ioctls\n\nMEMLOCK, MEMUNLOCK and OTPLOCK modify protection bits. Thus require\nwrite permission. Depending on the hardware MEMLOCK might even be\nwrite-once, e.g. for SPI-NOR flashes with their WP# tied to GND. OTPLOCK\nis always write-once.\n\nMEMSETBADBLOCK modifies the bad block table."
},
{
"lang": "es",
"value": "En el kernel de Linux se ha solucionado la siguiente vulnerabilidad: mtd: requiere permisos de escritura para bloqueo y badblock ioctls MEMLOCK, MEMUNLOCK y OTPLOCK modifican los bits de protecci\u00f3n. Por lo tanto, requiere permiso de escritura. Dependiendo del hardware, MEMLOCK podr\u00eda incluso ser de escritura \u00fanica, por ejemplo, para flashes SPI-NOR con su WP# vinculado a GND. OTPLOCK siempre se escribe una vez. MEMSETBADBLOCK modifica la tabla de bloques defectuosos."
}
],
"id": "CVE-2021-47055",
"lastModified": "2026-08-04T10:16:43.150",
"metrics": {
"cvssMetricV31": [
{
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"attackVector": "LOCAL",
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"baseScore": 7.1,
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"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H",
"version": "3.1"
},
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"impactScore": 5.2,
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"type": "Secondary"
},
{
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"baseScore": 5.5,
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"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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"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"
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],
"ssvcV203": [
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"options": [
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},
{
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},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2024-03-01T15:53:21.546664Z",
"version": "2.0.3"
}
}
]
},
"published": "2024-02-29T23:15:07.473",
"references": [
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"weaknesses": [
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{
"lang": "en",
"value": "CWE-667"
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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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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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