CVE-2021-47235 (GCVE-0-2021-47235)
Vulnerability from cvelistv5
Published
2024-05-21 14:19
Modified
2025-05-04 07:06
Severity ?
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/0260916843cc74f3906acf8b6f256693e01530a2 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/19f88ca68ccf8771276a606765239b167654f84a Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/1cafc540b7bf1b6a5a77dc000205fe337ef6eba6 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/95deeb29d831e2fae608439e243e7a520611e7ea Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/9cca0c2d70149160407bda9a9446ce0c29b6e6c6 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/b1ad283755095a4b9d1431aeb357d7df1a33d3bb Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/d11d79e52ba080ee567cb7d7eb42a5ade60a8130 Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67 https://git.kernel.org/stable/c/db2bc3cfd2bc01621014d4f17cdfc74611f339c8 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/0260916843cc74f3906acf8b6f256693e01530a2 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/19f88ca68ccf8771276a606765239b167654f84a Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/1cafc540b7bf1b6a5a77dc000205fe337ef6eba6 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/95deeb29d831e2fae608439e243e7a520611e7ea Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/9cca0c2d70149160407bda9a9446ce0c29b6e6c6 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/b1ad283755095a4b9d1431aeb357d7df1a33d3bb Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/d11d79e52ba080ee567cb7d7eb42a5ade60a8130 Patch
af854a3a-2127-422b-91ae-364da2661108 https://git.kernel.org/stable/c/db2bc3cfd2bc01621014d4f17cdfc74611f339c8 Patch
Impacted products
Vendor Product Version
Linux Linux Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
Version: 6af55ff52b02d492d45db88df3e461fa51a6f753
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    "nvd": "{\"cve\":{\"id\":\"CVE-2021-47235\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2024-05-21T15:15:12.777\",\"lastModified\":\"2024-12-30T19:06:05.170\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"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.\"},{\"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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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. 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      "cveMetadata": "{\"cveId\": \"CVE-2021-47235\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-05-04T07:06:51.851Z\", \"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": "5.1"
    }
  }
}


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