CVE-2021-47163
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2021-47163
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-47163.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-47163
- Related
- Published
- 2024-03-25T10:15:08Z
- Modified
- 2024-09-11T02:00:07Z
- Summary
- [none]
- Details
-
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: [] ? processonework+0x1a7/0x360 [] ? workerthread+0x30/0x390 [] ? createworker+0x1a0/0x1a0 [] ? kthread+0x116/0x130 [] ? kthreadflushworkfn+0x10/0x10 [] ? retfrom_fork+0x35/0x40
When removing the TIPC module, the UDP tunnel sock will be delayed to release in a work queue as sockrelease() can't be done in rtnllock(). 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 wqcount in tipcnet to track the numbers of work queues in schedule, and wait and exit until all work queues are done in tipcexitnet().
- References
-
- https://git.kernel.org/stable/c/04c26faa51d1e2fe71cf13c45791f5174c37f986
- https://git.kernel.org/stable/c/5195ec5e365a2a9331bfeb585b613a6e94f98dba
- https://git.kernel.org/stable/c/b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d
- https://git.kernel.org/stable/c/d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa
- https://security-tracker.debian.org/tracker/CVE-2021-47163
Affected packages
Debian:11 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:12 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source
Debian:13 / linux
Package
- Name
- linux
- Purl
- pkg:deb/debian/linux?arch=source