CVE-2021-47055 (GCVE-0-2021-47055)

Vulnerability from cvelistv5 – Published: 2024-02-29 22:37 – Updated: 2025-05-04 12:40
VLAI?
Title
mtd: require write permissions for locking and badblock ioctls
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 1c9f9125892a43901438bf704ada6b7019e2a884 , < f4d28d8b9b0e7c4ae04214b8d7e0b0466ec6bcaf (git)
Affected: 583d42400532fbd6228b0254d7c732b771e4750d , < 9625b00cac6630479c0ff4b9fafa88bee636e1f0 (git)
Affected: 389c74c218d3b182e9cd767e98cee0e0fd0dabaa , < f73b29819c6314c0ba8b7d5892dfb03487424bee (git)
Affected: ab1a602a9cea98aa37b2e6851b168d2a2633a58d , < 75ed985bd6c8ac1d4e673e93ea9d96c9908c1d37 (git)
Affected: 9a53e8bd59d9f070505e51d3fd19606a270e6b93 , < 5880afefe0cb9b2d5e801816acd58bfe91a96981 (git)
Affected: f7e6b19bc76471ba03725fe58e0c218a3d6266c3 , < 7b6552719c0ccbbea29dde4be141da54fdb5877e (git)
Affected: f7e6b19bc76471ba03725fe58e0c218a3d6266c3 , < 077259f5e777c3c8821f6b41dee709fcda27306b (git)
Affected: f7e6b19bc76471ba03725fe58e0c218a3d6266c3 , < a08799d3e8c8088640956237c183f83463c39668 (git)
Affected: f7e6b19bc76471ba03725fe58e0c218a3d6266c3 , < 1e97743fd180981bef5f01402342bb54bf1c6366 (git)
Affected: 36a8b2f49235e63ab3f901fe12e1b6732f075c2e (git)
Affected: eb3d82abc335624a5e8ecfb75aba0b684e2dc4db (git)
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    Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 4.4.269 , ≤ 4.4.* (semver)
Unaffected: 4.9.269 , ≤ 4.9.* (semver)
Unaffected: 4.14.233 , ≤ 4.14.* (semver)
Unaffected: 4.19.191 , ≤ 4.19.* (semver)
Unaffected: 5.4.119 , ≤ 5.4.* (semver)
Unaffected: 5.10.37 , ≤ 5.10.* (semver)
Unaffected: 5.11.21 , ≤ 5.11.* (semver)
Unaffected: 5.12.4 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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\"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.11.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.11.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/mtd/mtdchar.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f4d28d8b9b0e7c4ae04214b8d7e0b0466ec6bcaf\"}, {\"url\": \"https://git.kernel.org/stable/c/9625b00cac6630479c0ff4b9fafa88bee636e1f0\"}, {\"url\": \"https://git.kernel.org/stable/c/f73b29819c6314c0ba8b7d5892dfb03487424bee\"}, {\"url\": \"https://git.kernel.org/stable/c/75ed985bd6c8ac1d4e673e93ea9d96c9908c1d37\"}, {\"url\": \"https://git.kernel.org/stable/c/5880afefe0cb9b2d5e801816acd58bfe91a96981\"}, {\"url\": \"https://git.kernel.org/stable/c/7b6552719c0ccbbea29dde4be141da54fdb5877e\"}, {\"url\": \"https://git.kernel.org/stable/c/077259f5e777c3c8821f6b41dee709fcda27306b\"}, {\"url\": \"https://git.kernel.org/stable/c/a08799d3e8c8088640956237c183f83463c39668\"}, {\"url\": \"https://git.kernel.org/stable/c/1e97743fd180981bef5f01402342bb54bf1c6366\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.269\", \"versionStartIncluding\": \"4.4.233\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.269\", \"versionStartIncluding\": \"4.9.233\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.233\", \"versionStartIncluding\": \"4.14.194\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.191\", \"versionStartIncluding\": \"4.19.139\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.119\", \"versionStartIncluding\": \"5.4.58\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.37\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.21\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.4\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"5.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.7.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.8.1\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T12:40:58.929Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47055\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T12:40:58.929Z\", \"dateReserved\": \"2024-02-29T22:33:44.293Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-29T22:37:30.071Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}


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Sightings

Author Source Type Date

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.



Detection rules are retrieved from Rulezet.