CVE-2022-50005 (GCVE-0-2022-50005)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:01 – Updated: 2025-06-18 11:01
VLAI?
Title
nfc: pn533: Fix use-after-free bugs caused by pn532_cmd_timeout
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: c656aa4c27b17a8c70da223ed5ab42145800d6b5 , < 50403ee6daddf0d7a14e9d3b51a377c39a08ec8c (git)
Affected: c656aa4c27b17a8c70da223ed5ab42145800d6b5 , < 9c34c33893db7a80d0e4b55c23d3b65e29609cfb (git)
Affected: c656aa4c27b17a8c70da223ed5ab42145800d6b5 , < 2c71f5d55a86fd5969428abf525c1ae6b1c7b0f5 (git)
Affected: c656aa4c27b17a8c70da223ed5ab42145800d6b5 , < f1e941dbf80a9b8bab0bffbc4cbe41cc7f4c6fb6 (git)
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    Linux Linux Affected: 5.5
Unaffected: 0 , < 5.5 (semver)
Unaffected: 5.10.140 , ≤ 5.10.* (semver)
Unaffected: 5.15.64 , ≤ 5.15.* (semver)
Unaffected: 5.19.6 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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          "programFiles": [
            "drivers/nfc/pn533/uart.c"
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      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T11:01:10.610Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/f1e941dbf80a9b8bab0bffbc4cbe41cc7f4c6fb6"
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      "title": "nfc: pn533: Fix use-after-free bugs caused by pn532_cmd_timeout",
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    "datePublished": "2025-06-18T11:01:10.610Z",
    "dateReserved": "2025-06-18T10:57:27.388Z",
    "dateUpdated": "2025-06-18T11:01:10.610Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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