CVE-2021-47416 (GCVE-0-2021-47416)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:04 – Updated: 2025-05-04 07:10
VLAI?
Title
phy: mdio: fix memory leak
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 25e9f88c7e3cc35f5e3d3db199660d28a15df639 (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 2250392d930bd0d989f24d355d6355b0150256e7 (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < f4f502a04ee1e543825af78f47eb7785015cd9f6 (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 2397b9e118721292429fea8807a698e71b94795f (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 414bb4ead1362ef2c8592db723c017258f213988 (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 0d2dd40a7be61b89a7c99dae8ee96389d27b413a (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < 064c2616234a7394867c924b5c1303974f3a4f4d (git)
Affected: 46abc02175b3c246dd5141d878f565a8725060c9 , < ca6e11c337daf7925ff8a2aac8e84490a8691905 (git)
Create a notification for this product.
    Linux Linux Affected: 2.6.28
Unaffected: 0 , < 2.6.28 (semver)
Unaffected: 4.4.289 , ≤ 4.4.* (semver)
Unaffected: 4.9.287 , ≤ 4.9.* (semver)
Unaffected: 4.14.251 , ≤ 4.14.* (semver)
Unaffected: 4.19.211 , ≤ 4.19.* (semver)
Unaffected: 5.4.153 , ≤ 5.4.* (semver)
Unaffected: 5.10.73 , ≤ 5.10.* (semver)
Unaffected: 5.14.12 , ≤ 5.14.* (semver)
Unaffected: 5.15 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.289\", \"versionStartIncluding\": \"2.6.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.287\", \"versionStartIncluding\": \"2.6.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.251\", \"versionStartIncluding\": \"2.6.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.211\", \"versionStartIncluding\": \"2.6.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.153\", \"versionStartIncluding\": \"2.6.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.73\", \"versionStartIncluding\": \"2.6.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.14.12\", \"versionStartIncluding\": \"2.6.28\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15\", \"versionStartIncluding\": \"2.6.28\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2025-05-04T07:10:28.073Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47416\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:10:28.073Z\", \"dateReserved\": \"2024-05-21T14:58:30.818Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:04:06.042Z\", \"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.