CVE-2022-50005
nfc: pn533: Fix use-after-free bugs caused by pn532_cmd_timeout
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 83% of all CVEs (5 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Weakness
Affected products
- affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 – < 50403ee6daddf0d7a14e9d3b51a377c39a08ec8c
- affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 – < 9c34c33893db7a80d0e4b55c23d3b65e29609cfb
- affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 – < 2c71f5d55a86fd5969428abf525c1ae6b1c7b0f5
- affected c656aa4c27b17a8c70da223ed5ab42145800d6b5 – < f1e941dbf80a9b8bab0bffbc4cbe41cc7f4c6fb6
- affected 5.5
- unaffected < 5.5
- unaffected 5.10.140 – ≤ 5.10.*
- unaffected 5.15.64 – ≤ 5.15.*
- unaffected 5.19.6 – ≤ 5.19.*
- unaffected 6.0 – ≤ *
References (4)
- https://git.kernel.org/stable/c/50403ee6daddf0d7a14e9d3b51a377c39a08ec8c (opens in a new tab)
- https://git.kernel.org/stable/c/9c34c33893db7a80d0e4b55c23d3b65e29609cfb (opens in a new tab)
- https://git.kernel.org/stable/c/2c71f5d55a86fd5969428abf525c1ae6b1c7b0f5 (opens in a new tab)
- https://git.kernel.org/stable/c/f1e941dbf80a9b8bab0bffbc4cbe41cc7f4c6fb6 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-50005)Record last updated .