fkie_cve-2022-50005
Vulnerability from fkie_nvd
Published
2025-06-18 11:15
Modified
2025-06-18 13:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: nfc: pn533: Fix use-after-free bugs caused by pn532_cmd_timeout When the pn532 uart device is detaching, the pn532_uart_remove() is called. But there are no functions in pn532_uart_remove() that could delete the cmd_timeout timer, which will cause use-after-free bugs. The process is shown below: (thread 1) | (thread 2) | pn532_uart_send_frame pn532_uart_remove | mod_timer(&pn532->cmd_timeout,...) ... | (wait a time) kfree(pn532) //FREE | pn532_cmd_timeout | pn532_uart_send_frame | pn532->... //USE This patch adds del_timer_sync() in pn532_uart_remove() in order to prevent the use-after-free bugs. What's more, the pn53x_unregister_nfc() is well synchronized, it sets nfc_dev->shutting_down to true and there are no syscalls could restart the cmd_timeout timer.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2c71f5d55a86fd5969428abf525c1ae6b1c7b0f5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/50403ee6daddf0d7a14e9d3b51a377c39a08ec8c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9c34c33893db7a80d0e4b55c23d3b65e29609cfb
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f1e941dbf80a9b8bab0bffbc4cbe41cc7f4c6fb6
Impacted products
Vendor Product Version


To clipboard 

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: pn533: Fix use-after-free bugs caused by pn532_cmd_timeout\n\nWhen the pn532 uart device is detaching, the pn532_uart_remove()\nis called. But there are no functions in pn532_uart_remove() that\ncould delete the cmd_timeout timer, which will cause use-after-free\nbugs. The process is shown below:\n\n    (thread 1)                  |        (thread 2)\n                                |  pn532_uart_send_frame\npn532_uart_remove               |    mod_timer(\u0026pn532-\u003ecmd_timeout,...)\n  ...                           |    (wait a time)\n  kfree(pn532) //FREE           |    pn532_cmd_timeout\n                                |      pn532_uart_send_frame\n                                |        pn532-\u003e... //USE\n\nThis patch adds del_timer_sync() in pn532_uart_remove() in order to\nprevent the use-after-free bugs. What\u0027s more, the pn53x_unregister_nfc()\nis well synchronized, it sets nfc_dev-\u003eshutting_down to true and there\nare no syscalls could restart the cmd_timeout timer."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nfc: pn533: Se corrigen los errores de Use-After-Free causados por pn532_cmd_timeout. Cuando se desconecta el dispositivo uart pn532, se llama a pn532_uart_remove(). Sin embargo, no hay funciones en pn532_uart_remove() que puedan eliminar el temporizador cmd_timeout, lo que causar\u00eda errores de Use-After-Free. El proceso se muestra a continuaci\u00f3n: (hilo 1) | (hilo 2) | pn532_uart_send_frame pn532_uart_remove | mod_timer(\u0026amp;pn532-\u0026gt;cmd_timeout,...) ... | (esperar un tiempo) kfree(pn532) //FREE | pn532_cmd_timeout | pn532_uart_send_frame | pn532-\u0026gt;... //USE Este parche a\u00f1ade del_timer_sync() a pn532_uart_remove() para evitar errores de Use-After-Free. Adem\u00e1s, pn53x_unregister_nfc() est\u00e1 bien sincronizado, establece nfc_dev-\u0026gt;shutting_down como verdadero y ninguna llamada al sistema podr\u00eda reiniciar el temporizador cmd_timeout."
    }
  ],
  "id": "CVE-2022-50005",
  "lastModified": "2025-06-18T13:46:52.973",
  "metrics": {},
  "published": "2025-06-18T11:15:28.397",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/2c71f5d55a86fd5969428abf525c1ae6b1c7b0f5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/50403ee6daddf0d7a14e9d3b51a377c39a08ec8c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9c34c33893db7a80d0e4b55c23d3b65e29609cfb"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f1e941dbf80a9b8bab0bffbc4cbe41cc7f4c6fb6"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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