# CVE-2021-47163: linux: In the Linux kernel, the following vulnerability has been resolved:  tipc: wait and exit until all work queues are do...

CVE-2021-47163 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47163, released March 25, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47163
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 25, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  tipc: wait and exit until all work queues are done  On some host, a crash could be triggered simply by repeating these commands several times:    # modprobe tipc   # tipc bearer enable media udp name UDP1 localip 127.0.0.1   # rmmod tipc    [] BUG: unable to handle kernel paging request at ffffffffc096bb00   [] Workqueue: events 0xffffffffc096bb00   [] Call Trace:   []  ? process_one_work+0x1a7/0x360   []  ? worker_thread+0x30/0x390   []  ? create_worker+0x1a0/0x1a0   []  ? kthread+0x116/0x130   []  ? kthread_flush_work_fn+0x10/0x10   []  ? ret_from_fork+0x35/0x40  When removing the TIPC module, the UDP tunnel sock will be delayed to release in a work queue as sock_release() can't be done in rtnl_lock(). If the work queue is schedule to run after the TIPC module is removed, kernel will crash as the work queue function cleanup_beareri() code no longer exists when trying to invoke it.  To fix it, this patch introduce a member wq_count in tipc_net to track the numbers of work queues in schedule, and  wait and exit until all work queues are done in tipc_exit_net().

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.14.6-1 | [DEBIAN-CVE-2021-47163](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47163.md) | Mar 25, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.14.6-1 | [DEBIAN-CVE-2021-47163](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47163.md) | Mar 25, 2024 |
| Linux | linux Debian 14 | 5.14.6-1 | [DEBIAN-CVE-2021-47163](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47163.md) | Mar 25, 2024 |

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