CVE-2024-56641 (GCVE-0-2024-56641)

Vulnerability from cvelistv5 – Published: 2024-12-27 15:02 – Updated: 2026-10-15 21:41
VLAI
Title
net/smc: initialize close_work early to avoid warning
Summary
In the Linux kernel, the following vulnerability has been resolved: net/smc: initialize close_work early to avoid warning We encountered a warning that close_work was canceled before initialization. WARNING: CPU: 7 PID: 111103 at kernel/workqueue.c:3047 __flush_work+0x19e/0x1b0 Workqueue: events smc_lgr_terminate_work [smc] RIP: 0010:__flush_work+0x19e/0x1b0 Call Trace: ? __wake_up_common+0x7a/0x190 ? work_busy+0x80/0x80 __cancel_work_timer+0xe3/0x160 smc_close_cancel_work+0x1a/0x70 [smc] smc_close_active_abort+0x207/0x360 [smc] __smc_lgr_terminate.part.38+0xc8/0x180 [smc] process_one_work+0x19e/0x340 worker_thread+0x30/0x370 ? process_one_work+0x340/0x340 kthread+0x117/0x130 ? __kthread_cancel_work+0x50/0x50 ret_from_fork+0x22/0x30 This is because when smc_close_cancel_work is triggered, e.g. the RDMA driver is rmmod and the LGR is terminated, the conn->close_work is flushed before initialization, resulting in WARN_ON(!work->func). __smc_lgr_terminate | smc_connect_{rdma|ism} ------------------------------------------------------------- | smc_conn_create | \- smc_lgr_register_conn for conn in lgr->conns_all | \- smc_conn_kill | \- smc_close_active_abort | \- smc_close_cancel_work | \- cancel_work_sync | \- __flush_work | (close_work) | | smc_close_init | \- INIT_WORK(&close_work) So fix this by initializing close_work before establishing the connection.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:41 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7067 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 46c28dbd4c23c3f7fa37f5ea48772af79c9cc40e , < f0c37002210aaede10dae849d1a78efc2243add2 (git)
Affected: 46c28dbd4c23c3f7fa37f5ea48772af79c9cc40e , < 6638e52dcfafaf1b9cbc34544f0c832db0069ea1 (git)
Affected: 46c28dbd4c23c3f7fa37f5ea48772af79c9cc40e , < 0541db8ee32c09463a72d0987382b3a3336b0043 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 6.6.66 , ≤ 6.6.* (semver)
Unaffected: 6.12.5 , ≤ 6.12.* (semver)
Unaffected: 6.13 , ≤ * (original_commit_for_fix)
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        "descriptions": [
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            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: initialize close_work early to avoid warning\n\nWe encountered a warning that close_work was canceled before\ninitialization.\n\n  WARNING: CPU: 7 PID: 111103 at kernel/workqueue.c:3047 __flush_work+0x19e/0x1b0\n  Workqueue: events smc_lgr_terminate_work [smc]\n  RIP: 0010:__flush_work+0x19e/0x1b0\n  Call Trace:\n   ? __wake_up_common+0x7a/0x190\n   ? work_busy+0x80/0x80\n   __cancel_work_timer+0xe3/0x160\n   smc_close_cancel_work+0x1a/0x70 [smc]\n   smc_close_active_abort+0x207/0x360 [smc]\n   __smc_lgr_terminate.part.38+0xc8/0x180 [smc]\n   process_one_work+0x19e/0x340\n   worker_thread+0x30/0x370\n   ? process_one_work+0x340/0x340\n   kthread+0x117/0x130\n   ? __kthread_cancel_work+0x50/0x50\n   ret_from_fork+0x22/0x30\n\nThis is because when smc_close_cancel_work is triggered, e.g. the RDMA\ndriver is rmmod and the LGR is terminated, the conn-\u003eclose_work is\nflushed before initialization, resulting in WARN_ON(!work-\u003efunc).\n\n__smc_lgr_terminate             | smc_connect_{rdma|ism}\n-------------------------------------------------------------\n                                | smc_conn_create\n\t\t\t\t| \\- smc_lgr_register_conn\nfor conn in lgr-\u003econns_all      |\n\\- smc_conn_kill                |\n   \\- smc_close_active_abort    |\n      \\- smc_close_cancel_work  |\n         \\- cancel_work_sync    |\n            \\- __flush_work     |\n\t         (close_work)   |\n\t                        | smc_close_init\n\t                        | \\- INIT_WORK(\u0026close_work)\n\nSo fix this by initializing close_work before establishing the\nconnection."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/smc: inicializar close_work antes para evitar advertencias Encontramos una advertencia que indicaba que close_work se cancel\u00f3 antes de la inicializaci\u00f3n. ADVERTENCIA: CPU: 7 PID: 111103 en kernel/workqueue.c:3047 __flush_work+0x19e/0x1b0 Workqueue: eventos smc_lgr_terminate_work [smc] RIP: 0010:__flush_work+0x19e/0x1b0 Rastreo de llamadas: ? __wake_up_common+0x7a/0x190 ? trabajo_ocupado+0x80/0x80 __cancelar_temporizador_trabajo+0xe3/0x160 smc_cerrar_cancelar_trabajo+0x1a/0x70 [smc] smc_cerrar_aborto_activo+0x207/0x360 [smc] __smc_lgr_terminate.part.38+0xc8/0x180 [smc] proceso_uno_trabajo+0x19e/0x340 subproceso_trabajador+0x30/0x370 ? proceso_uno_trabajo+0x340/0x340 kthread+0x117/0x130 ? __kthread_cancel_work+0x50/0x50 ret_from_fork+0x22/0x30 Esto se debe a que cuando se activa smc_close_cancel_work, p. ej., el controlador RDMA es rmmod y se termina el LGR, conn-\u0026gt;close_work se vac\u00eda antes de la inicializaci\u00f3n, lo que genera WARN_ON(!work-\u0026gt;func). __smc_lgr_terminate | smc_connect_{rdma|ism} ------------------------------------------------------------- | smc_conn_create | \\- smc_lgr_register_conn para conn en lgr-\u0026gt;conns_all | \\- smc_conn_kill | \\- smc_close_active_abort | \\- smc_close_cancel_work | \\- cancel_work_sync | \\- __flush_work | (close_work) | | smc_close_init | \\- INIT_WORK(\u0026amp;close_work) Solucione esto inicializando close_work antes de establecer la conexi\u00f3n."
          }
        ],
        "id": "CVE-2024-56641",
        "lastModified": "2026-10-15T22:18:02.013",
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        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Modified",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "NVD-CWE-noinfo"
              }
            ],
            "source": "nvd@nist.gov",
            "type": "Primary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-10-16T23:07:50+00:00",
      "cve": "CVE-2024-56641",
      "id": "CVE-2024-56641",
      "initial_release_date": "2024-12-27T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net/smc: initialize close_work early to avoid warning",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-56641.json",
      "version": "3"
    }
  }
}



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Sightings

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Nomenclature

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