CVE-2021-46905 (GCVE-0-2021-46905)

Vulnerability from cvelistv5 – Published: 2024-02-25 14:03 – Updated: 2025-05-04 07:00
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: net: hso: fix NULL-deref on disconnect regression Commit 8a12f8836145 ("net: hso: fix null-ptr-deref during tty device unregistration") fixed the racy minor allocation reported by syzbot, but introduced an unconditional NULL-pointer dereference on every disconnect instead. Specifically, the serial device table must no longer be accessed after the minor has been released by hso_serial_tty_unregister().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: a462067d7c8e6953a733bf5ade8db947b1bb5449 , < 5871761c5f0f20d6e98bf3b6bd7486d857589554 (git)
Affected: 145c89c441d27696961752bf51b323f347601bee , < 0c71d4c89559f72cec2592d078681a843bce570e (git)
Affected: caf5ac93b3b5d5fac032fc11fbea680e115421b4 , < 24b699bea7553fc0b98dad9d864befb6005ac7f1 (git)
Affected: 92028d7a31e55d53e41cff679156b9432cffcb36 , < 5c17cfe155d21954b4c7e2a78fa771cebcd86725 (git)
Affected: 4a2933c88399c0ebc738db39bbce3ae89786d723 , < d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e (git)
Affected: dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac , < 90642ee9eb581a13569b1c0bd57e85d962215273 (git)
Affected: 388d05f70f1ee0cac4a2068fd295072f1a44152a , < 0f000005da31f6947f843ce6b3e3a960540c6e00 (git)
Affected: 8a12f8836145ffe37e9c8733dce18c22fb668b66 , < 41c44e1f3112d7265dae522c026399b2a42d19ef (git)
Affected: 8a12f8836145ffe37e9c8733dce18c22fb668b66 , < 2ad5692db72874f02b9ad551d26345437ea4f7f3 (git)
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    Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 4.19.189 , ≤ 4.19.* (semver)
Unaffected: 5.4.115 , ≤ 5.4.* (semver)
Unaffected: 5.10.33 , ≤ 5.10.* (semver)
Unaffected: 5.11.17 , ≤ 5.11.* (semver)
Unaffected: 5.12.1 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
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      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-476\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2021-46905\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-02-26T16:27:45.367\",\"lastModified\":\"2024-11-21T06:34:54.113\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: hso: fix NULL-deref on disconnect regression\\n\\nCommit 8a12f8836145 (\\\"net: hso: fix null-ptr-deref during tty device\\nunregistration\\\") fixed the racy minor allocation reported by syzbot, but\\nintroduced an unconditional NULL-pointer dereference on every disconnect\\ninstead.\\n\\nSpecifically, the serial device table must no longer be accessed after\\nthe minor has been released by hso_serial_tty_unregister().\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net: hso: corrige NULL-deref durante la regresi\u00f3n de desconexi\u00f3n. El Commit 8a12f8836145 (\\\"net: hso: corrige null-ptr-deref durante la cancelaci\u00f3n del registro del dispositivo tty\\\") corrigi\u00f3 la asignaci\u00f3n menor picante reportada por syzbot, pero en su lugar introdujo una desreferencia de puntero NULL incondicional en cada desconexi\u00f3n. Espec\u00edficamente, ya no se debe acceder a la tabla de dispositivos serie despu\u00e9s de que hso_serial_tty_unregister() haya liberado al menor.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":5.5,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":3.6}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-476\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.19.189\",\"matchCriteriaId\":\"4018ABCC-3436-498F-A06A-64578CF99BC5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20.0\",\"versionEndExcluding\":\"5.4.115\",\"matchCriteriaId\":\"CC57D065-3933-4083-BA07-817D4CBF8157\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5.0\",\"versionEndExcluding\":\"5.10.33\",\"matchCriteriaId\":\"995EF7FE-8C8F-470B-8214-BC0C68B162C3\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11.0\",\"versionEndExcluding\":\"5.11.17\",\"matchCriteriaId\":\"6C74925C-5E45-4C6F-9E47-653DC5ACBE9E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"75EB504D-4A83-4C67-9C8D-FD9C6C8EB4CD\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc1:*:*:*:*:*:*\",\"matchCriteriaId\":\"07875739-0CCB-4F48-9330-3D4B6A4064FA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc2:*:*:*:*:*:*\",\"matchCriteriaId\":\"DA09B732-04F8-452C-94CF-97644E78684D\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc3:*:*:*:*:*:*\",\"matchCriteriaId\":\"E5371152-7515-4908-BB7E-494805EA5DF2\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc4:*:*:*:*:*:*\",\"matchCriteriaId\":\"D7788E5B-D54E-45BF-9043-2C7B77842FD0\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc5:*:*:*:*:*:*\",\"matchCriteriaId\":\"A935F9F1-DA8B-49F4-BF2B-FA01A92F113E\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc6:*:*:*:*:*:*\",\"matchCriteriaId\":\"DF0AF673-12B7-4274-9090-411D4939CB62\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:5.12:rc7:*:*:*:*:*:*\",\"matchCriteriaId\":\"06AE06A6-A0C3-4556-BFFA-3D6E4BAC43C8\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0c71d4c89559f72cec2592d078681a843bce570e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/24b699bea7553fc0b98dad9d864befb6005ac7f1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5871761c5f0f20d6e98bf3b6bd7486d857589554\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5c17cfe155d21954b4c7e2a78fa771cebcd86725\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/90642ee9eb581a13569b1c0bd57e85d962215273\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/d7fad2ce15bdbbd0fec3ebe999fd7cab2267f53e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0c71d4c89559f72cec2592d078681a843bce570e\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/0f000005da31f6947f843ce6b3e3a960540c6e00\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/24b699bea7553fc0b98dad9d864befb6005ac7f1\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/2ad5692db72874f02b9ad551d26345437ea4f7f3\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/41c44e1f3112d7265dae522c026399b2a42d19ef\",\"source\":\"af854a3a-2127-422b-91ae-364da2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      "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.