7.8

CVE-2021-47163: tipc: wait and exit until all work queues are done

Modified
AliasesUBUNTU-CVE-2021-47163DEBIAN-CVE-2021-47163
Published 25-03-2024Last modified 05-08-2026

Vulnerability summary

CVE-2021-47163 is a high (CVSS 7.8) Improper Locking vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.4% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.19%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 13 · Related 12
SUSE-SU-2024:4100-1SUSE-SU-2025:0034-1SUSE-SU-2025:01633-1SUSE-SU-2025:1574-1USN-7496-1USN-7496-2

Timeline

  1. 25-03-2024
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.19%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.19% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu86 products
  • linux< 4.4.0-268.302 | < 4.15.0-237.249 | < 5.4.0-80.90
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 4.4.0-1143.149 | < 4.4.0-1181.196 | < 4.15.0-1180.193 | < 5.4.0-1054.57
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ d0f91938bede204a343473792529e0db7d599836, < d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa | ≥ d0f91938bede204a343473792529e0db7d599836, < 5195ec5e365a2a9331bfeb585b613a6e94f98dba | ≥ d0f91938bede204a343473792529e0db7d599836, < b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d | ≥ d0f91938bede204a343473792529e0db7d599836, < 04c26faa51d1e2fe71cf13c45791f5174c37f986 | 4.1
  • linux_kernel≥ 4.1, < 5.4.124 | ≥ 5.5, < 5.10.42 | ≥ 5.11, < 5.12.9 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3
Debian1 product
  • linux< 5.14.6-1

3 vendors · 89 products

References

15 links
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