CVE-2021-46904 (GCVE-0-2021-46904)

Vulnerability from cvelistv5 – Published: 2024-02-25 14:03 – Updated: 2025-05-04 06:59
VLAI?
Title
net: hso: fix null-ptr-deref during tty device unregistration
Summary
In the Linux kernel, the following vulnerability has been resolved: net: hso: fix null-ptr-deref during tty device unregistration Multiple ttys try to claim the same the minor number causing a double unregistration of the same device. The first unregistration succeeds but the next one results in a null-ptr-deref. The get_free_serial_index() function returns an available minor number but doesn't assign it immediately. The assignment is done by the caller later. But before this assignment, calls to get_free_serial_index() would return the same minor number. Fix this by modifying get_free_serial_index to assign the minor number immediately after one is found to be and rename it to obtain_minor() to better reflect what it does. Similary, rename set_serial_by_index() to release_minor() and modify it to free up the minor number of the given hso_serial. Every obtain_minor() should have corresponding release_minor() call.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 72dc1c096c7051a48ab1dbb12f71976656b55eb5 , < a462067d7c8e6953a733bf5ade8db947b1bb5449 (git)
Affected: 72dc1c096c7051a48ab1dbb12f71976656b55eb5 , < 145c89c441d27696961752bf51b323f347601bee (git)
Affected: 72dc1c096c7051a48ab1dbb12f71976656b55eb5 , < caf5ac93b3b5d5fac032fc11fbea680e115421b4 (git)
Affected: 72dc1c096c7051a48ab1dbb12f71976656b55eb5 , < 92028d7a31e55d53e41cff679156b9432cffcb36 (git)
Affected: 72dc1c096c7051a48ab1dbb12f71976656b55eb5 , < 4a2933c88399c0ebc738db39bbce3ae89786d723 (git)
Affected: 72dc1c096c7051a48ab1dbb12f71976656b55eb5 , < dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac (git)
Affected: 72dc1c096c7051a48ab1dbb12f71976656b55eb5 , < 388d05f70f1ee0cac4a2068fd295072f1a44152a (git)
Affected: 72dc1c096c7051a48ab1dbb12f71976656b55eb5 , < 8a12f8836145ffe37e9c8733dce18c22fb668b66 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.27
Unaffected: 0 , < 2.6.27 (semver)
Unaffected: 4.4.268 , ≤ 4.4.* (semver)
Unaffected: 4.9.268 , ≤ 4.9.* (semver)
Unaffected: 4.14.232 , ≤ 4.14.* (semver)
Unaffected: 4.19.187 , ≤ 4.19.* (semver)
Unaffected: 5.4.112 , ≤ 5.4.* (semver)
Unaffected: 5.10.30 , ≤ 5.10.* (semver)
Unaffected: 5.11.14 , ≤ 5.11.* (semver)
Unaffected: 5.12 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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The first unregistration succeeds\\nbut the next one results in a null-ptr-deref.\\n\\nThe get_free_serial_index() function returns an available minor number\\nbut doesn\u0027t assign it immediately. The assignment is done by the caller\\nlater. But before this assignment, calls to get_free_serial_index()\\nwould return the same minor number.\\n\\nFix this by modifying get_free_serial_index to assign the minor number\\nimmediately after one is found to be and rename it to obtain_minor()\\nto better reflect what it does. Similary, rename set_serial_by_index()\\nto release_minor() and modify it to free up the minor number of the\\ngiven hso_serial. Every obtain_minor() should have corresponding\\nrelease_minor() call.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.268\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.268\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.232\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.187\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.112\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.30\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.11.14\", \"versionStartIncluding\": \"2.6.27\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12\", \"versionStartIncluding\": \"2.6.27\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T06:59:59.657Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-46904\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T06:59:59.657Z\", \"dateReserved\": \"2024-02-25T13:45:52.716Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-25T14:03:40.319Z\", \"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.