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CVE-2021-47235 (GCVE-0-2021-47235)

Vulnerability from cvelistv5 – Published: 2024-05-21 14:19 – Updated: 2026-05-11 13:50
VLAI
Title
net: ethernet: fix potential use-after-free in ec_bhf_remove
Summary
In the Linux kernel, the following vulnerability has been resolved: net: ethernet: fix potential use-after-free in ec_bhf_remove static void ec_bhf_remove(struct pci_dev *dev) { ... struct ec_bhf_priv *priv = netdev_priv(net_dev); unregister_netdev(net_dev); free_netdev(net_dev); pci_iounmap(dev, priv->dma_io); pci_iounmap(dev, priv->io); ... } priv is netdev private data, but it is used after free_netdev(). It can cause use-after-free when accessing priv pointer. So, fix it by moving free_netdev() after pci_iounmap() calls.
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-17 17:38 UTC
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6af55ff52b02d492d45db88df3e461fa51a6f753 , < db2bc3cfd2bc01621014d4f17cdfc74611f339c8 (git)
Affected: 6af55ff52b02d492d45db88df3e461fa51a6f753 , < 1cafc540b7bf1b6a5a77dc000205fe337ef6eba6 (git)
Affected: 6af55ff52b02d492d45db88df3e461fa51a6f753 , < b1ad283755095a4b9d1431aeb357d7df1a33d3bb (git)
Affected: 6af55ff52b02d492d45db88df3e461fa51a6f753 , < 0260916843cc74f3906acf8b6f256693e01530a2 (git)
Affected: 6af55ff52b02d492d45db88df3e461fa51a6f753 , < 19f88ca68ccf8771276a606765239b167654f84a (git)
Affected: 6af55ff52b02d492d45db88df3e461fa51a6f753 , < 95deeb29d831e2fae608439e243e7a520611e7ea (git)
Affected: 6af55ff52b02d492d45db88df3e461fa51a6f753 , < d11d79e52ba080ee567cb7d7eb42a5ade60a8130 (git)
Affected: 6af55ff52b02d492d45db88df3e461fa51a6f753 , < 9cca0c2d70149160407bda9a9446ce0c29b6e6c6 (git)
guessed Create a notification for this product.
Linux Linux Affected: 3.15
Unaffected: 0 , < 3.15 (semver)
Unaffected: 4.4.274 , ≤ 4.4.* (semver)
Unaffected: 4.9.274 , ≤ 4.9.* (semver)
Unaffected: 4.14.238 , ≤ 4.14.* (semver)
Unaffected: 4.19.196 , ≤ 4.19.* (semver)
Unaffected: 5.4.128 , ≤ 5.4.* (semver)
Unaffected: 5.10.46 , ≤ 5.10.* (semver)
Unaffected: 5.12.13 , ≤ 5.12.* (semver)
Unaffected: 5.13 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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So, fix it by moving free_netdev() after pci_iounmap()\\ncalls.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net: ethernet: soluciona el posible use after free en ec_bhf_remove static void ec_bhf_remove(struct pci_dev *dev) { ... struct ec_bhf_priv *priv = netdev_priv(net_dev); anular el registro_netdev(net_dev); free_netdev(net_dev); pci_iounmap(dev, priv-\u0026gt;dma_io); pci_iounmap(dev, priv-\u0026gt;io); ... } priv son datos privados de netdev, pero se usan despu\u00e9s de free_netdev(). Puede causar use after free al acceder al puntero privado. Entonces, solucionelo moviendo free_netdev() despu\u00e9s de las llamadas a 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2025-11-21T11:31:46+00:00",
      "cve": "CVE-2021-47235",
      "id": "CVE-2021-47235",
      "initial_release_date": "2021-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "198",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: ethernet: fix potential use-after-free in ec_bhf_remove",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2021/cve-2021-47235.json",
      "version": "3"
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      "current_release_date": "2026-09-13T23:56:36Z",
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      "initial_release_date": "2024-05-23T03:05:33Z",
      "product_status:known_affected": "530",
      "product_status:known_not_affected": "182",
      "product_status:recommended": "175",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2021-47235",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2021-47235.json",
      "version": "52"
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\"semver\", \"lessThanOrEqual\": \"4.9.*\"}, {\"status\": \"unaffected\", \"version\": \"4.14.238\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.14.*\"}, {\"status\": \"unaffected\", \"version\": \"4.19.196\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.128\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.46\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.12.13\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.12.*\"}, {\"status\": \"unaffected\", \"version\": \"5.13\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/net/ethernet/ec_bhf.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/db2bc3cfd2bc01621014d4f17cdfc74611f339c8\"}, {\"url\": \"https://git.kernel.org/stable/c/1cafc540b7bf1b6a5a77dc000205fe337ef6eba6\"}, {\"url\": \"https://git.kernel.org/stable/c/b1ad283755095a4b9d1431aeb357d7df1a33d3bb\"}, {\"url\": \"https://git.kernel.org/stable/c/0260916843cc74f3906acf8b6f256693e01530a2\"}, {\"url\": \"https://git.kernel.org/stable/c/19f88ca68ccf8771276a606765239b167654f84a\"}, {\"url\": \"https://git.kernel.org/stable/c/95deeb29d831e2fae608439e243e7a520611e7ea\"}, {\"url\": \"https://git.kernel.org/stable/c/d11d79e52ba080ee567cb7d7eb42a5ade60a8130\"}, {\"url\": \"https://git.kernel.org/stable/c/9cca0c2d70149160407bda9a9446ce0c29b6e6c6\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: ethernet: fix potential use-after-free in ec_bhf_remove\\n\\nstatic void ec_bhf_remove(struct pci_dev *dev)\\n{\\n...\\n\\tstruct ec_bhf_priv *priv = netdev_priv(net_dev);\\n\\n\\tunregister_netdev(net_dev);\\n\\tfree_netdev(net_dev);\\n\\n\\tpci_iounmap(dev, priv-\u003edma_io);\\n\\tpci_iounmap(dev, priv-\u003eio);\\n...\\n}\\n\\npriv is netdev private data, but it is used\\nafter free_netdev(). It can cause use-after-free when accessing priv\\npointer. So, fix it by moving free_netdev() after pci_iounmap()\\ncalls.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.4.274\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.9.274\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.14.238\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.196\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.128\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.46\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.12.13\", \"versionStartIncluding\": \"3.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.13\", \"versionStartIncluding\": \"3.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-05-11T13:50:34.524Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47235\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-05-11T13:50:34.524Z\", \"dateReserved\": \"2024-04-10T18:59:19.531Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T14:19:37.070Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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.


Detection rules are retrieved from Rulezet.


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.