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Ubuntu: (CVE-2021-47163): linux vulnerability

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Ubuntu: (CVE-2021-47163): linux vulnerability

Severity
4
CVSS
(AV:L/AC:M/Au:N/C:P/I:P/A:P)
Published
03/25/2024
Created
11/21/2024
Added
11/19/2024
Modified
02/11/2025

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, andwait and exit until all work queues are done in tipc_exit_net().

Solution(s)

  • ubuntu-upgrade-linux
  • ubuntu-upgrade-linux-aws
  • ubuntu-upgrade-linux-aws-5-4
  • ubuntu-upgrade-linux-aws-fips
  • ubuntu-upgrade-linux-azure
  • ubuntu-upgrade-linux-azure-5-4
  • ubuntu-upgrade-linux-azure-fips
  • ubuntu-upgrade-linux-bluefield
  • ubuntu-upgrade-linux-fips
  • ubuntu-upgrade-linux-gcp
  • ubuntu-upgrade-linux-gcp-5-4
  • ubuntu-upgrade-linux-gcp-fips
  • ubuntu-upgrade-linux-gkeop
  • ubuntu-upgrade-linux-hwe-5-4
  • ubuntu-upgrade-linux-kvm
  • ubuntu-upgrade-linux-oracle
  • ubuntu-upgrade-linux-oracle-5-4
  • ubuntu-upgrade-linux-raspi
  • ubuntu-upgrade-linux-raspi-5-4

References

  • https://attackerkb.com/topics/cve-2021-47163
  • CVE - 2021-47163
  • 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://www.cve.org/CVERecord?id=CVE-2021-47163
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