Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 before 50403ee6daddf0d7a14e9d3b51a377c39a08ec8c; affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 before 9c34c33893db7a80d0e4b55c23d3b65e29609cfb; affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 before 2c71f5d55a86fd5969428abf525c1ae6b1c7b0f5; affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 before f1e941dbf80a9b8bab0bffbc4cbe41cc7f4c6fb6 |
| Linux / Linux | affected 5.5; unaffected 0 before 5.5; unaffected 5.10.140 through 5.10.*; unaffected 5.15.64 through 5.15.*; unaffected 5.19.6 through 5.19.*; unaffected 6.0 through * |
CWE
No CWE identifiers supplied.