CVE-2021-47163
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…
Does this matter?
Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own.
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().
- CVSS 3.1
- 5.5 MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.19% probability · 8th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-667
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/04c26faa51d1e2fe71cf13c45791f5174c37f986Patch
- https://git.kernel.org/stable/c/5195ec5e365a2a9331bfeb585b613a6e94f98dbaPatch
- https://git.kernel.org/stable/c/b9f5b7ad4ac3af006443f535b1ce7bff1d130d7dPatch
- https://git.kernel.org/stable/c/d1f76dfadaf8f47ed1753f97dbcbd41c16215ffaPatch
- https://git.kernel.org/stable/c/04c26faa51d1e2fe71cf13c45791f5174c37f986Patch
- https://git.kernel.org/stable/c/5195ec5e365a2a9331bfeb585b613a6e94f98dbaPatch
- https://git.kernel.org/stable/c/b9f5b7ad4ac3af006443f535b1ce7bff1d130d7dPatch
- https://git.kernel.org/stable/c/d1f76dfadaf8f47ed1753f97dbcbd41c16215ffaPatch
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.