Vulnerability-Lookup

GSD-2021-47163

Vulnerability from gsd - Updated: 2024-04-03 05:03

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: [] ? 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().

Aliases

CVE-2021-47163

JSON

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{
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2021-47163"
      ],
      "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: wait and exit until all work queues are done\n\nOn some host, a crash could be triggered simply by repeating these\ncommands several times:\n\n  # modprobe tipc\n  # tipc bearer enable media udp name UDP1 localip 127.0.0.1\n  # rmmod tipc\n\n  [] BUG: unable to handle kernel paging request at ffffffffc096bb00\n  [] Workqueue: events 0xffffffffc096bb00\n  [] Call Trace:\n  []  ? process_one_work+0x1a7/0x360\n  []  ? worker_thread+0x30/0x390\n  []  ? create_worker+0x1a0/0x1a0\n  []  ? kthread+0x116/0x130\n  []  ? kthread_flush_work_fn+0x10/0x10\n  []  ? ret_from_fork+0x35/0x40\n\nWhen removing the TIPC module, the UDP tunnel sock will be delayed to\nrelease in a work queue as sock_release() can\u0027t be done in rtnl_lock().\nIf the work queue is schedule to run after the TIPC module is removed,\nkernel will crash as the work queue function cleanup_beareri() code no\nlonger exists when trying to invoke it.\n\nTo fix it, this patch introduce a member wq_count in tipc_net to track\nthe numbers of work queues in schedule, and  wait and exit until all\nwork queues are done in tipc_exit_net().",
      "id": "GSD-2021-47163",
      "modified": "2024-04-03T05:03:54.916264Z",
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: wait and exit until all work queues are done\n\nOn some host, a crash could be triggered simply by repeating these\ncommands several times:\n\n  # modprobe tipc\n  # tipc bearer enable media udp name UDP1 localip 127.0.0.1\n  # rmmod tipc\n\n  [] BUG: unable to handle kernel paging request at ffffffffc096bb00\n  [] Workqueue: events 0xffffffffc096bb00\n  [] Call Trace:\n  []  ? process_one_work+0x1a7/0x360\n  []  ? worker_thread+0x30/0x390\n  []  ? create_worker+0x1a0/0x1a0\n  []  ? kthread+0x116/0x130\n  []  ? kthread_flush_work_fn+0x10/0x10\n  []  ? ret_from_fork+0x35/0x40\n\nWhen removing the TIPC module, the UDP tunnel sock will be delayed to\nrelease in a work queue as sock_release() can\u0027t be done in rtnl_lock().\nIf the work queue is schedule to run after the TIPC module is removed,\nkernel will crash as the work queue function cleanup_beareri() code no\nlonger exists when trying to invoke it.\n\nTo fix it, this patch introduce a member wq_count in tipc_net to track\nthe numbers of work queues in schedule, and  wait and exit until all\nwork queues are done in tipc_exit_net()."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntipc: wait and exit until all work queues are done\n\nOn some host, a crash could be triggered simply by repeating these\ncommands several times:\n\n  # modprobe tipc\n  # tipc bearer enable media udp name UDP1 localip 127.0.0.1\n  # rmmod tipc\n\n  [] BUG: unable to handle kernel paging request at ffffffffc096bb00\n  [] Workqueue: events 0xffffffffc096bb00\n  [] Call Trace:\n  []  ? process_one_work+0x1a7/0x360\n  []  ? worker_thread+0x30/0x390\n  []  ? create_worker+0x1a0/0x1a0\n  []  ? kthread+0x116/0x130\n  []  ? kthread_flush_work_fn+0x10/0x10\n  []  ? ret_from_fork+0x35/0x40\n\nWhen removing the TIPC module, the UDP tunnel sock will be delayed to\nrelease in a work queue as sock_release() can\u0027t be done in rtnl_lock().\nIf the work queue is schedule to run after the TIPC module is removed,\nkernel will crash as the work queue function cleanup_beareri() code no\nlonger exists when trying to invoke it.\n\nTo fix it, this patch introduce a member wq_count in tipc_net to track\nthe numbers of work queues in schedule, and  wait and exit until all\nwork queues are done in tipc_exit_net()."
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          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tipc: espere y salga hasta que todas las colas de trabajo est\u00e9n terminadas. En algunos hosts, se podr\u00eda desencadenar un bloqueo simplemente repitiendo estos comandos varias veces: # modprobe tipc # tipc portador habilitar media udp nombre UDP1 localip 127.0.0.1 # rmmod tipc [] ERROR: no se puede manejar la solicitud de paginaci\u00f3n del kernel en ffffffffc096bb00 [] Cola de trabajo: eventos 0xffffffffc096bb00 [] Seguimiento de llamadas: []? proceso_one_work+0x1a7/0x360 []? hilo_trabajador+0x30/0x390 []? crear_trabajador+0x1a0/0x1a0 []? kthread+0x116/0x130 []? kthread_flush_work_fn+0x10/0x10 []? ret_from_fork+0x35/0x40 Al retirar el m\u00f3dulo TIPC, el calcet\u00edn del t\u00fanel UDP se retrasar\u00e1 para liberarse en una cola de trabajo, ya que sock_release() no se puede realizar en rtnl_lock(). Si la cola de trabajo est\u00e1 programada para ejecutarse despu\u00e9s de eliminar el m\u00f3dulo TIPC, el kernel fallar\u00e1 porque el c\u00f3digo de la funci\u00f3n de cola de trabajo cleanup_beareri() ya no existe al intentar invocarlo. Para solucionarlo, este parche introduce un miembro wq_count en tipc_net para rastrear el n\u00famero de colas de trabajo programadas y esperar y salir hasta que todas las colas de trabajo est\u00e9n terminadas en tipc_exit_net()."
          }
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        "id": "CVE-2021-47163",
        "lastModified": "2024-03-25T13:47:14.087",
        "metrics": {},
        "published": "2024-03-25T10:15:08.530",
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}

CVE-2021-47163 (GCVE-0-2021-47163)

Vulnerability from cvelistv5 – Published: 2024-03-25 09:16 – Updated: 2026-08-05 08:46

Title

tipc: wait and exit until all work queues are done

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-04-01 19:41 UTC

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6856 records in the last 180 days details

References

4 references

URL	Tags
https://git.kernel.org/stable/c/d1f76dfadaf8f47ed…
https://git.kernel.org/stable/c/5195ec5e365a2a933…
https://git.kernel.org/stable/c/b9f5b7ad4ac3af006…
https://git.kernel.org/stable/c/04c26faa51d1e2fe7…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d0f91938bede204a343473792529e0db7d599836 , < d1f76dfadaf8f47ed1753f97dbcbd41c16215ffa (git) Affected: d0f91938bede204a343473792529e0db7d599836 , < 5195ec5e365a2a9331bfeb585b613a6e94f98dba (git) Affected: d0f91938bede204a343473792529e0db7d599836 , < b9f5b7ad4ac3af006443f535b1ce7bff1d130d7d (git) Affected: d0f91938bede204a343473792529e0db7d599836 , < 04c26faa51d1e2fe71cf13c45791f5174c37f986 (git)
Linux	Linux	Affected: 4.1 Unaffected: 0 , < 4.1 (semver) Unaffected: 5.4.124 , ≤ 5.4.* (semver) Unaffected: 5.10.42 , ≤ 5.10.* (semver) Unaffected: 5.12.9 , ≤ 5.12.* (semver) Unaffected: 5.13 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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                "id": "CVE-2021-47163",
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              "value": "AV:L - The bug is reached via local tipc generic-netlink bearer enable/disable and netns teardown (or local rmmod of tipc); it is not triggered by processing unsolicited remote TIPC/UDP packets.\nAC:L - The attacker controls both sides of the race by enabling a UDP bearer and then destroying the netns (or repeating modprobe/enable/rmmod), so the pending cleanup_bearer work is reliably left running after tipc_exit_net returns.\nPR:L - At the time of this bug, TIPCv2 bearer mutators lacked GENL_ADMIN_PERM, and an unprivileged user can create a user+net namespace (unshare -Urn) and enable a tipc UDP bearer whenever tipc is loaded; CAP_NET_ADMIN in a userns is also Low per guidance.\nUI:N - No victim action is required; the attacker enables the bearer and tears down their own netns (or unloads tipc) entirely on their own.\nS:U - Impact is a host-kernel use-after-free/crash within the same kernel security authority; there is no VM, IOMMU, or sandbox boundary crossing.\nC:H - tipc_exit_net returns without waiting for cleanup_bearer while kernel UDP sockets hold no netns refcount, so the work runs against freed net/module state; this UAF can be leveraged for arbitrary kernel memory disclosure.\nI:H - The same UAF (and the module-unload path that invokes freed cleanup_bearer text via the workqueue) is memory corruption exploitable for write primitives and control-flow hijacking, not merely a clean crash.\nA:H - The reported failure is a kernel paging-request oops when the workqueue runs after tipc teardown/unload, and the netns UAF path likewise causes kernel crashes."
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        },
        {
          "url": "https://git.kernel.org/stable/c/04c26faa51d1e2fe71cf13c45791f5174c37f986"
        }
      ],
      "title": "tipc: wait and exit until all work queues are done",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47163",
    "datePublished": "2024-03-25T09:16:16.676Z",
    "dateReserved": "2024-03-25T09:12:14.109Z",
    "dateUpdated": "2026-08-05T08:46:27.215Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

Publication & reservation Sightings KEV catalogs Other timestamps

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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