fkie_cve-2021-47479
Vulnerability from fkie_nvd
Published
2024-05-22 09:15
Modified
2025-09-24 19:04
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63edPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/a65c9afe9f2f55b7a7fb4a25ab654cd4139683a4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/befd23bd3b17f1a3f9c943a8580b47444c7c63edPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c052cc1a069c3e575619cf64ec427eb41176ca70Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/c430094541a80575259a94ff879063ef01473506Patch
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


To clipboard 

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  "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"
    },
    {
      "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": "2025-09-24T19:04:38.687",
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          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.0,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-05-22T09:15:09.817",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-416"
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      "source": "nvd@nist.gov",
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}


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