ghsa-4q85-vfwh-w392
Vulnerability from github
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.
{
"affected": [],
"aliases": [
"CVE-2022-50005"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-06-18T11:15:28Z",
"severity": null
},
"details": "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.",
"id": "GHSA-4q85-vfwh-w392",
"modified": "2025-06-18T12:30:40Z",
"published": "2025-06-18T12:30:40Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-50005"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/2c71f5d55a86fd5969428abf525c1ae6b1c7b0f5"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/50403ee6daddf0d7a14e9d3b51a377c39a08ec8c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/9c34c33893db7a80d0e4b55c23d3b65e29609cfb"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f1e941dbf80a9b8bab0bffbc4cbe41cc7f4c6fb6"
}
],
"schema_version": "1.4.0",
"severity": []
}
Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
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