CVE-2022-49300 (GCVE-0-2022-49300)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:10 – Updated: 2026-05-11 18:57
VLAI
Title
nbd: fix race between nbd_alloc_config() and module removal
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: fix race between nbd_alloc_config() and module removal When nbd module is being removing, nbd_alloc_config() may be called concurrently by nbd_genl_connect(), although try_module_get() will return false, but nbd_alloc_config() doesn't handle it. The race may lead to the leak of nbd_config and its related resources (e.g, recv_workq) and oops in nbd_read_stat() due to the unload of nbd module as shown below: BUG: kernel NULL pointer dereference, address: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996) Workqueue: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Call Trace: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Fixing it by checking the return value of try_module_get() in nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV), assign nbd->config only when nbd_alloc_config() succeeds to ensure the value of nbd->config is binary (valid or NULL). Also adding a debug message to check the reference counter of nbd_config during module removal.
Severity
4.7 (Medium)
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 19:44 UTC
CWE
  • CWE-476 - NULL Pointer Dereference
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6843 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 165cf2e0019fa6cedc75b456490c41494c34abb4 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 2573f2375b64280be977431701ed5d33b75b9ad0 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 8a7da4ced236ce6637fe70f14ca18e718d4bf9e9 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 122e4adaff2439f1cc18cc7e931980fa7560df5c (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 71c142f910da44421213ade601bcbd23ceae19fa (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < 2888fa41985f93ed0a6837cfbb06bcbfd7fa2314 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < d09525720dd5201756f698bee1076de9aefd4602 (git)
Affected: 5ea8d10802ec4c153a6e21eebaf412e2abd29736 , < c55b2b983b0fa012942c3eb16384b2b722caa810 (git)
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Linux Linux Affected: 4.12
Unaffected: 0 , < 4.12 (semver)
Unaffected: 4.14.283 , ≤ 4.14.* (semver)
Unaffected: 4.19.247 , ≤ 4.19.* (semver)
Unaffected: 5.4.198 , ≤ 5.4.* (semver)
Unaffected: 5.10.122 , ≤ 5.10.* (semver)
Unaffected: 5.15.47 , ≤ 5.15.* (semver)
Unaffected: 5.17.15 , ≤ 5.17.* (semver)
Unaffected: 5.18.4 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: fix race between nbd_alloc_config() and module removal\n\nWhen nbd module is being removing, nbd_alloc_config() may be\ncalled concurrently by nbd_genl_connect(), although try_module_get()\nwill return false, but nbd_alloc_config() doesn\u0027t handle it.\n\nThe race may lead to the leak of nbd_config and its related\nresources (e.g, recv_workq) and oops in nbd_read_stat() due\nto the unload of nbd module as shown below:\n\n  BUG: kernel NULL pointer dereference, address: 0000000000000040\n  Oops: 0000 [#1] SMP PTI\n  CPU: 5 PID: 13840 Comm: kworker/u17:33 Not tainted 5.14.0+ #1\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)\n  Workqueue: knbd16-recv recv_work [nbd]\n  RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd]\n  Call Trace:\n   recv_work+0x3b/0xb0 [nbd]\n   process_one_work+0x1ed/0x390\n   worker_thread+0x4a/0x3d0\n   kthread+0x12a/0x150\n   ret_from_fork+0x22/0x30\n\nFixing it by checking the return value of try_module_get()\nin nbd_alloc_config(). As nbd_alloc_config() may return ERR_PTR(-ENODEV),\nassign nbd-\u003econfig only when nbd_alloc_config() succeeds to ensure\nthe value of nbd-\u003econfig is binary (valid or NULL).\n\nAlso adding a debug message to check the reference counter\nof nbd_config during module removal."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: nbd: se corrige la ejecuci\u00f3n entre nbd_alloc_config() y la eliminaci\u00f3n del m\u00f3dulo Cuando se elimina el m\u00f3dulo nbd, nbd_alloc_config() puede ser llamado simult\u00e1neamente por nbd_genl_connect(), aunque try_module_get() devolver\u00e1 falso, pero nbd_alloc_config() no lo maneja. La ejecuci\u00f3n puede provocar la fuga de nbd_config y sus recursos relacionados (por ejemplo, recv_workq) y oops en nbd_read_stat() debido a la descarga del m\u00f3dulo nbd como se muestra a continuaci\u00f3n: ERROR: desreferencia de puntero NULL del n\u00facleo, direcci\u00f3n: 0000000000000040 Oops: 0000 [#1] SMP PTI CPU: 5 PID: 13840 Comm: kworker/u17:33 No contaminado 5.14.0+ #1 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996) Cola de trabajo: knbd16-recv recv_work [nbd] RIP: 0010:nbd_read_stat.cold+0x130/0x1a4 [nbd] Rastreo de llamadas: recv_work+0x3b/0xb0 [nbd] process_one_work+0x1ed/0x390 worker_thread+0x4a/0x3d0 kthread+0x12a/0x150 ret_from_fork+0x22/0x30 Lo solucionamos comprobando el valor de retorno de try_module_get() en nbd_alloc_config(). Como nbd_alloc_config() puede devolver ERR_PTR(-ENODEV), asigne nbd-\u0026gt;config solo cuando nbd_alloc_config() tenga \u00e9xito para garantizar que el valor de nbd-\u0026gt;config sea binario (v\u00e1lido o NULL). Tambi\u00e9n se agreg\u00f3 un mensaje de depuraci\u00f3n para comprobar el contador de referencia de nbd_config durante la eliminaci\u00f3n del m\u00f3dulo."
          }
        ],
        "id": "CVE-2022-49300",
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      "current_release_date": "2026-06-29T21:04:18+00:00",
      "cve": "CVE-2022-49300",
      "id": "CVE-2022-49300",
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      "product_status:known_affected": "62",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nbd: fix race between nbd_alloc_config() and module removal",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49300.json",
      "version": "3"
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              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
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              "defaultStatus": "unaffected",
              "product": "Linux",
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            }
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}



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