nfc: pn533: Fix use-after-free bugs caused by pn532_cmd_timeout

{
  "id": "f8df84e3a6c51eb90b6911557162a2a14215cbaa3a9afa25de4ec54245fa67bf",
  "url": "https://osv.dev/vulnerability/CVE-2022-50005",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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.",
    "evidence": "osv:CVE-2022-50005",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.140",
            "evidence": "/affected/1/ranges"
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            "value": "5.15.64",
            "evidence": "/affected/1/ranges"
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            "value": "5.19.6",
            "evidence": "/affected/1/ranges"
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-50005",
      "aliases": [
        "CVE-2022-50005"
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      "modified": "2026-10-28T02:30:26.662027213Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2c71f5d55a86fd5969428abf525c1ae6b1c7b0f5",
        "https://git.kernel.org/stable/c/50403ee6daddf0d7a14e9d3b51a377c39a08ec8c",
        "https://git.kernel.org/stable/c/9c34c33893db7a80d0e4b55c23d3b65e29609cfb",
        "https://git.kernel.org/stable/c/f1e941dbf80a9b8bab0bffbc4cbe41cc7f4c6fb6",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50005.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50005",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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    "related_cves": [
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        "value": "CVE-2022-50005",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 493157,
  "published_at": "2025-06-18T11:01:10.61+00:00"
}