Vulnerability-Lookup

FKIE_CVE-2021-47479

Vulnerability from fkie_nvd - Published: 2024-05-22 09:15 - Updated: 2026-06-17 04:17

Severity

7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: staging: rtl8712: fix use-after-free in rtl8712_dl_fw Syzbot reported use-after-free in rtl8712_dl_fw(). The problem was in race condition between r871xu_dev_remove() ->ndo_open() callback. It's easy to see from crash log, that driver accesses released firmware in ->ndo_open() callback. It may happen, since driver was releasing firmware _before_ unregistering netdev. Fix it by moving unregister_netdev() before cleaning up resources. Call Trace: ... rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline] rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170 rtl8712_hal_init drivers/staging/rtl8712/hal_init.c:330 [inline] rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394 netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380 __dev_open+0x2bc/0x4d0 net/core/dev.c:1484 Freed by task 1306: ... release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053 r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70	Patch
af854a3a-2127-422b-91ae-364da2661108	https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	3.3
linux	linux_kernel	3.3
linux	linux_kernel	3.3
linux	linux_kernel	3.3
linux	linux_kernel	3.3

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/staging/rtl8712/usb_intf.c"
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      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8712: fix use-after-free in rtl8712_dl_fw\n\nSyzbot reported use-after-free in rtl8712_dl_fw(). The problem was in\nrace condition between r871xu_dev_remove() -\u003endo_open() callback.\n\nIt\u0027s easy to see from crash log, that driver accesses released firmware\nin -\u003endo_open() callback. It may happen, since driver was releasing\nfirmware _before_ unregistering netdev. Fix it by moving\nunregister_netdev() before cleaning up resources.\n\nCall Trace:\n...\n rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline]\n rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170\n rtl8712_hal_init drivers/staging/rtl8712/hal_init.c:330 [inline]\n rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394\n netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380\n __dev_open+0x2bc/0x4d0 net/core/dev.c:1484\n\nFreed by task 1306:\n...\n release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053\n r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599\n usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: staging: rtl8712: corrige el use-after-free en rtl8712_dl_fw Syzbot inform\u00f3 el use-after-free en rtl8712_dl_fw(). El problema estaba en la condici\u00f3n de ejecuci\u00f3n entre la devoluci\u00f3n de llamada r871xu_dev_remove() -\u0026gt;ndo_open(). Es f\u00e1cil ver en el registro de fallos que el controlador accede al firmware lanzado en la devoluci\u00f3n de llamada -\u0026gt;ndo_open(). Puede suceder, ya que el controlador estaba lanzando el firmware _antes_ de cancelar el registro de netdev. Solucionarlo moviendo unregister_netdev() antes de limpiar los recursos. Traza de llamada: ... RTL871X_OPEN_FW : 330 [ inline] rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394 netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380 __dev_open+0x2bc/0x4d0 net/core/dev.c:1484 Liberado por tarea 1306: ... release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053 r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599 usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver .c:458"
    }
  ],
  "id": "CVE-2021-47479",
  "lastModified": "2026-06-17T04:17:34.233",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
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          "baseScore": 7.0,
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          "confidentialityImpact": "HIGH",
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}

CVE-2021-47479 (GCVE-0-2021-47479)

Vulnerability from cvelistv5 – Published: 2024-05-22 08:19 – Updated: 2026-05-23 15:20

Title

staging: rtl8712: fix use-after-free in rtl8712_dl_fw

Summary

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-05-24 19:24 UTC

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/c430094541a805752…
https://git.kernel.org/stable/c/befd23bd3b17f1a3f…
https://git.kernel.org/stable/c/a65c9afe9f2f55b7a…
https://git.kernel.org/stable/c/c052cc1a069c3e575…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 8c213fa59199f9673d66970d6940fa093186642f , < c430094541a80575259a94ff879063ef01473506 (git) Affected: 8c213fa59199f9673d66970d6940fa093186642f , < befd23bd3b17f1a3f9c943a8580b47444c7c63ed (git) Affected: 8c213fa59199f9673d66970d6940fa093186642f , < a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4 (git) Affected: 8c213fa59199f9673d66970d6940fa093186642f , < c052cc1a069c3e575619cf64ec427eb41176ca70 (git) Affected: bc5d453eab4506cb52397db8830d1070904265a4 (git) Affected: 3.2.6 , < 3.3 (semver)
Linux	Linux	Affected: 3.3 Unaffected: 0 , < 3.3 (semver) Unaffected: 5.10.79 , ≤ 5.10.* (semver) Unaffected: 5.14.18 , ≤ 5.14.* (semver) Unaffected: 5.15.2 , ≤ 5.15.* (semver) Unaffected: 5.16 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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                  "versionEndExcluding": "5.14.18",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.2",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.16",
                  "versionStartIncluding": "3.3",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "3.2.6",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nstaging: rtl8712: fix use-after-free in rtl8712_dl_fw\n\nSyzbot reported use-after-free in rtl8712_dl_fw(). The problem was in\nrace condition between r871xu_dev_remove() -\u003endo_open() callback.\n\nIt\u0027s easy to see from crash log, that driver accesses released firmware\nin -\u003endo_open() callback. It may happen, since driver was releasing\nfirmware _before_ unregistering netdev. Fix it by moving\nunregister_netdev() before cleaning up resources.\n\nCall Trace:\n...\n rtl871x_open_fw drivers/staging/rtl8712/hal_init.c:83 [inline]\n rtl8712_dl_fw+0xd95/0xe10 drivers/staging/rtl8712/hal_init.c:170\n rtl8712_hal_init drivers/staging/rtl8712/hal_init.c:330 [inline]\n rtl871x_hal_init+0xae/0x180 drivers/staging/rtl8712/hal_init.c:394\n netdev_open+0xe6/0x6c0 drivers/staging/rtl8712/os_intfs.c:380\n __dev_open+0x2bc/0x4d0 net/core/dev.c:1484\n\nFreed by task 1306:\n...\n release_firmware+0x1b/0x30 drivers/base/firmware_loader/main.c:1053\n r871xu_dev_remove+0xcc/0x2c0 drivers/staging/rtl8712/usb_intf.c:599\n usb_unbind_interface+0x1d8/0x8d0 drivers/usb/core/driver.c:458"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:20:04.414Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506"
        },
        {
          "url": "https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63ed"
        },
        {
          "url": "https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4"
        },
        {
          "url": "https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70"
        }
      ],
      "title": "staging: rtl8712: fix use-after-free in rtl8712_dl_fw",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47479",
    "datePublished": "2024-05-22T08:19:32.174Z",
    "dateReserved": "2024-05-22T06:20:56.200Z",
    "dateUpdated": "2026-05-23T15:20:04.414Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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.