CVE-2025-68372 (GCVE-0-2025-68372)

Vulnerability from cvelistv5 – Published: 2025-12-24 10:33 – Updated: 2026-06-16 19:28
VLAI
Title
nbd: defer config put in recv_work
Summary
In the Linux kernel, the following vulnerability has been resolved: nbd: defer config put in recv_work There is one uaf issue in recv_work when running NBD_CLEAR_SOCK and NBD_CMD_RECONFIGURE: nbd_genl_connect // conf_ref=2 (connect and recv_work A) nbd_open // conf_ref=3 recv_work A done // conf_ref=2 NBD_CLEAR_SOCK // conf_ref=1 nbd_genl_reconfigure // conf_ref=2 (trigger recv_work B) close nbd // conf_ref=1 recv_work B config_put // conf_ref=0 atomic_dec(&config->recv_threads); -> UAF Or only running NBD_CLEAR_SOCK: nbd_genl_connect // conf_ref=2 nbd_open // conf_ref=3 NBD_CLEAR_SOCK // conf_ref=2 close nbd nbd_release config_put // conf_ref=1 recv_work config_put // conf_ref=0 atomic_dec(&config->recv_threads); -> UAF Commit 87aac3a80af5 ("nbd: call nbd_config_put() before notifying the waiter") moved nbd_config_put() to run before waking up the waiter in recv_work, in order to ensure that nbd_start_device_ioctl() would not be woken up while nbd->task_recv was still uncleared. However, in nbd_start_device_ioctl(), after being woken up it explicitly calls flush_workqueue() to make sure all current works are finished. Therefore, there is no need to move the config put ahead of the wakeup. Move nbd_config_put() to the end of recv_work, so that the reference is held for the whole lifetime of the worker thread. This makes sure the config cannot be freed while recv_work is still running, even if clear + reconfigure interleave. In addition, we don't need to worry about recv_work dropping the last nbd_put (which causes deadlock): path A (netlink with NBD_CFLAG_DESTROY_ON_DISCONNECT): connect // nbd_refs=1 (trigger recv_work) open nbd // nbd_refs=2 NBD_CLEAR_SOCK close nbd nbd_release nbd_disconnect_and_put flush_workqueue // recv_work done nbd_config_put nbd_put // nbd_refs=1 nbd_put // nbd_refs=0 queue_work path B (netlink without NBD_CFLAG_DESTROY_ON_DISCONNECT): connect // nbd_refs=2 (trigger recv_work) open nbd // nbd_refs=3 NBD_CLEAR_SOCK // conf_refs=2 close nbd nbd_release nbd_config_put // conf_refs=1 nbd_put // nbd_refs=2 recv_work done // conf_refs=0, nbd_refs=1 rmmod // nbd_refs=0 Depends-on: e2daec488c57 ("nbd: Fix hungtask when nbd_config_put")
Severity
No CVSS data available.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-16 19:28 UTC
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7033 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 87aac3a80af5cbad93e63250e8a1e19095ba0d30 , < 198aa230a6f8c1f6af7ed26b29180749c3e79e4d (git)
Affected: 87aac3a80af5cbad93e63250e8a1e19095ba0d30 , < d3ba312675911ff9e3fefefd551751e153a9f0a9 (git)
Affected: 87aac3a80af5cbad93e63250e8a1e19095ba0d30 , < 3692884bd6187d89d41eef81e5a9724519fd01c1 (git)
Affected: 87aac3a80af5cbad93e63250e8a1e19095ba0d30 , < 1ba2ced2bbdf7e64a30c3e88c70ea8bc208d1509 (git)
Affected: 87aac3a80af5cbad93e63250e8a1e19095ba0d30 , < 6b69593f72e1bfba6ca47ca8d9b619341fded7d6 (git)
Affected: 87aac3a80af5cbad93e63250e8a1e19095ba0d30 , < 443a1721806b6ff6303b5229e9811d68172d622f (git)
Affected: 87aac3a80af5cbad93e63250e8a1e19095ba0d30 , < 742012f6bf29553fdc460bf646a58df3a7b43d01 (git)
Affected: 87aac3a80af5cbad93e63250e8a1e19095ba0d30 , < 9517b82d8d422d426a988b213fdd45c6b417b86d (git)
Affected: 0a4e383fc3aa6540f804c4fd1184a96ae5de6ef8 (git)
Affected: 2ef6f4bd60411934e3fc2715442c2afe70f84bf3 (git)
Affected: 742fd49cf811ca164489e339b862e3fb8e240a73 (git)
Affected: 14df8724aeeef338172e2a2d6efadc989921ca0f (git)
Affected: 4.14.204 , < 4.15 (semver)
Affected: 4.19.155 , < 4.20 (semver)
Affected: 5.4.75 , < 5.5 (semver)
Affected: 5.9.5 , < 5.10 (semver)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (semver)
Unaffected: 5.10.248 , ≤ 5.10.* (semver)
Unaffected: 5.15.198 , ≤ 5.15.* (semver)
Unaffected: 6.1.160 , ≤ 6.1.* (semver)
Unaffected: 6.6.120 , ≤ 6.6.* (semver)
Unaffected: 6.12.63 , ≤ 6.12.* (semver)
Unaffected: 6.17.13 , ≤ 6.17.* (semver)
Unaffected: 6.18.2 , ≤ 6.18.* (semver)
Unaffected: 6.19 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: defer config put in recv_work\n\nThere is one uaf issue in recv_work when running NBD_CLEAR_SOCK and\nNBD_CMD_RECONFIGURE:\n  nbd_genl_connect     // conf_ref=2 (connect and recv_work A)\n  nbd_open\t       // conf_ref=3\n  recv_work A done     // conf_ref=2\n  NBD_CLEAR_SOCK       // conf_ref=1\n  nbd_genl_reconfigure // conf_ref=2 (trigger recv_work B)\n  close nbd\t       // conf_ref=1\n  recv_work B\n    config_put         // conf_ref=0\n    atomic_dec(\u0026config-\u003erecv_threads); -\u003e UAF\n\nOr only running NBD_CLEAR_SOCK:\n  nbd_genl_connect   // conf_ref=2\n  nbd_open \t     // conf_ref=3\n  NBD_CLEAR_SOCK     // conf_ref=2\n  close nbd\n    nbd_release\n      config_put     // conf_ref=1\n  recv_work\n    config_put \t     // conf_ref=0\n    atomic_dec(\u0026config-\u003erecv_threads); -\u003e UAF\n\nCommit 87aac3a80af5 (\"nbd: call nbd_config_put() before notifying the\nwaiter\") moved nbd_config_put() to run before waking up the waiter in\nrecv_work, in order to ensure that nbd_start_device_ioctl() would not\nbe woken up while nbd-\u003etask_recv was still uncleared.\n\nHowever, in nbd_start_device_ioctl(), after being woken up it explicitly\ncalls flush_workqueue() to make sure all current works are finished.\nTherefore, there is no need to move the config put ahead of the wakeup.\n\nMove nbd_config_put() to the end of recv_work, so that the reference is\nheld for the whole lifetime of the worker thread. This makes sure the\nconfig cannot be freed while recv_work is still running, even if clear\n+ reconfigure interleave.\n\nIn addition, we don\u0027t need to worry about recv_work dropping the last\nnbd_put (which causes deadlock):\n\npath A (netlink with NBD_CFLAG_DESTROY_ON_DISCONNECT):\n  connect  // nbd_refs=1 (trigger recv_work)\n  open nbd // nbd_refs=2\n  NBD_CLEAR_SOCK\n  close nbd\n    nbd_release\n      nbd_disconnect_and_put\n        flush_workqueue // recv_work done\n      nbd_config_put\n        nbd_put // nbd_refs=1\n      nbd_put // nbd_refs=0\n        queue_work\n\npath B (netlink without NBD_CFLAG_DESTROY_ON_DISCONNECT):\n  connect  // nbd_refs=2 (trigger recv_work)\n  open nbd // nbd_refs=3\n  NBD_CLEAR_SOCK // conf_refs=2\n  close nbd\n    nbd_release\n      nbd_config_put // conf_refs=1\n      nbd_put // nbd_refs=2\n  recv_work done // conf_refs=0, nbd_refs=1\n  rmmod // nbd_refs=0\n\nDepends-on: e2daec488c57 (\"nbd: Fix hungtask when nbd_config_put\")"
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    "cveId": "CVE-2025-68372",
    "datePublished": "2025-12-24T10:33:02.679Z",
    "dateReserved": "2025-12-16T14:48:05.310Z",
    "dateUpdated": "2026-06-16T19:28:42.649Z",
    "state": "PUBLISHED"
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            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: defer config put in recv_work\n\nThere is one uaf issue in recv_work when running NBD_CLEAR_SOCK and\nNBD_CMD_RECONFIGURE:\n  nbd_genl_connect     // conf_ref=2 (connect and recv_work A)\n  nbd_open\t       // conf_ref=3\n  recv_work A done     // conf_ref=2\n  NBD_CLEAR_SOCK       // conf_ref=1\n  nbd_genl_reconfigure // conf_ref=2 (trigger recv_work B)\n  close nbd\t       // conf_ref=1\n  recv_work B\n    config_put         // conf_ref=0\n    atomic_dec(\u0026config-\u003erecv_threads); -\u003e UAF\n\nOr only running NBD_CLEAR_SOCK:\n  nbd_genl_connect   // conf_ref=2\n  nbd_open \t     // conf_ref=3\n  NBD_CLEAR_SOCK     // conf_ref=2\n  close nbd\n    nbd_release\n      config_put     // conf_ref=1\n  recv_work\n    config_put \t     // conf_ref=0\n    atomic_dec(\u0026config-\u003erecv_threads); -\u003e UAF\n\nCommit 87aac3a80af5 (\"nbd: call nbd_config_put() before notifying the\nwaiter\") moved nbd_config_put() to run before waking up the waiter in\nrecv_work, in order to ensure that nbd_start_device_ioctl() would not\nbe woken up while nbd-\u003etask_recv was still uncleared.\n\nHowever, in nbd_start_device_ioctl(), after being woken up it explicitly\ncalls flush_workqueue() to make sure all current works are finished.\nTherefore, there is no need to move the config put ahead of the wakeup.\n\nMove nbd_config_put() to the end of recv_work, so that the reference is\nheld for the whole lifetime of the worker thread. This makes sure the\nconfig cannot be freed while recv_work is still running, even if clear\n+ reconfigure interleave.\n\nIn addition, we don\u0027t need to worry about recv_work dropping the last\nnbd_put (which causes deadlock):\n\npath A (netlink with NBD_CFLAG_DESTROY_ON_DISCONNECT):\n  connect  // nbd_refs=1 (trigger recv_work)\n  open nbd // nbd_refs=2\n  NBD_CLEAR_SOCK\n  close nbd\n    nbd_release\n      nbd_disconnect_and_put\n        flush_workqueue // recv_work done\n      nbd_config_put\n        nbd_put // nbd_refs=1\n      nbd_put // nbd_refs=0\n        queue_work\n\npath B (netlink without NBD_CFLAG_DESTROY_ON_DISCONNECT):\n  connect  // nbd_refs=2 (trigger recv_work)\n  open nbd // nbd_refs=3\n  NBD_CLEAR_SOCK // conf_refs=2\n  close nbd\n    nbd_release\n      nbd_config_put // conf_refs=1\n      nbd_put // nbd_refs=2\n  recv_work done // conf_refs=0, nbd_refs=1\n  rmmod // nbd_refs=0\n\nDepends-on: e2daec488c57 (\"nbd: Fix hungtask when nbd_config_put\")"
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnbd: aplazar la liberaci\u00f3n de la configuraci\u00f3n en recv_work\n\nExiste un problema de UAF en recv_work al ejecutar NBD_CLEAR_SOCK y NBD_CMD_RECONFIGURE:\n  nbd_genl_connect     // conf_ref=2 (conexi\u00f3n y recv_work A)\n  nbd_open\t       // conf_ref=3\n  recv_work A terminado     // conf_ref=2\n  NBD_CLEAR_SOCK       // conf_ref=1\n  nbd_genl_reconfigure // conf_ref=2 (activa recv_work B)\n  close nbd\t       // conf_ref=1\n  recv_work\n    config_put         // conf_ref=0\n    atomic_dec(\u0026config -\u003e recv_threads);  -\u003e  UAF\n\nO solo ejecutando NBD_CLEAR_SOCK:\n  nbd_genl_connect   // conf_ref=2\n  nbd_open \t     // conf_ref=3\n  NBD_CLEAR_SOCK     // conf_ref=2\n  close nbd\n    nbd_release\n      config_put     // conf_ref=1\n  recv_work\n    config_put \t     // conf_ref=0\n    atomic_dec(\u0026config -\u003e recv_threads);  -\u003e  UAF\n\nEl commit 87aac3a80af5 (\u0027nbd: call nbd_config_put() before notifying the waiter\u0027) movi\u00f3 nbd_config_put() para ejecutarse antes de despertar al \u0027waiter\u0027 en recv_work, con el fin de asegurar que nbd_start_device_ioctl() no fuera despertado mientras nbd -\u003e task_recv a\u00fan no hab\u00eda sido limpiado.\n\nSin embargo, en nbd_start_device_ioctl(), despu\u00e9s de ser despertado, llama expl\u00edcitamente a flush_workqueue() para asegurarse de que todos los trabajos actuales hayan terminado.\nPor lo tanto, no es necesario mover la liberaci\u00f3n de la configuraci\u00f3n antes del despertar.\n\nMover nbd_config_put() al final de recv_work, para que la referencia se mantenga durante toda la vida \u00fatil del hilo de trabajo. Esto asegura que la configuraci\u00f3n no pueda ser liberada mientras recv_work a\u00fan se est\u00e9 ejecutando, incluso si se intercala clear + reconfigure.\n\nAdem\u00e1s, no necesitamos preocuparnos de que recv_work libere el \u00faltimo nbd_put (lo que causa un interbloqueo):\n\nruta A (netlink con NBD_CFLAG_DESTROY_ON_DISCONNECT):\n  connect  // nbd_refs=1 (activa recv_work)\n  open nbd // nbd_refs=2\n  NBD_CLEAR_SOCK\n  close nbd\n    nbd_release\n      nbd_disconnect_and_put\n        flush_workqueue // recv_work terminado\n      nbd_config_put\n        nbd_put // nbd_refs=1\n      nbd_put // nbd_refs=0\n        queue_work\n\nruta B (netlink sin NBD_CFLAG_DESTROY_ON_DISCONNECT):\n  connect  // nbd_refs=2 (activa recv_work)\n  open nbd // nbd_refs=3\n  NBD_CLEAR_SOCK // conf_refs=2\n  close nbd\n    nbd_release\n      nbd_config_put // conf_refs=1\n      nbd_put // nbd_refs=2\n  recv_work terminado // conf_refs=0, nbd_refs=1\n  rmmod // nbd_refs=0\n\nDepende de: e2daec488c57 (\u0027nbd: Fix hungtask when nbd_config_put\u0027)"
          }
        ],
        "id": "CVE-2025-68372",
        "lastModified": "2026-10-13T11:10:00.203",
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      "product_status:known_affected": "246",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: nbd: defer config put in recv_work",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-68372.json",
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            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnbd: defer config put in recv_work\n\nThere is one uaf issue in recv_work when running NBD_CLEAR_SOCK and\nNBD_CMD_RECONFIGURE:\n  nbd_genl_connect     // conf_ref=2 (connect and recv_work A)\n  nbd_open\t       // conf_ref=3\n  recv_work A done     // conf_ref=2\n  NBD_CLEAR_SOCK       // conf_ref=1\n  nbd_genl_reconfigure // conf_ref=2 (trigger recv_work B)\n  close nbd\t       // conf_ref=1\n  recv_work B\n    config_put         // conf_ref=0\n    atomic_dec(\u0026config-\u003erecv_threads); -\u003e UAF\n\nOr only running NBD_CLEAR_SOCK:\n  nbd_genl_connect   // conf_ref=2\n  nbd_open \t     // conf_ref=3\n  NBD_CLEAR_SOCK     // conf_ref=2\n  close nbd\n    nbd_release\n      config_put     // conf_ref=1\n  recv_work\n    config_put \t     // conf_ref=0\n    atomic_dec(\u0026config-\u003erecv_threads); -\u003e UAF\n\nCommit 87aac3a80af5 (\"nbd: call nbd_config_put() before notifying the\nwaiter\") moved nbd_config_put() to run before waking up the waiter in\nrecv_work, in order to ensure that nbd_start_device_ioctl() would not\nbe woken up while nbd-\u003etask_recv was still uncleared.\n\nHowever, in nbd_start_device_ioctl(), after being woken up it explicitly\ncalls flush_workqueue() to make sure all current works are finished.\nTherefore, there is no need to move the config put ahead of the wakeup.\n\nMove nbd_config_put() to the end of recv_work, so that the reference is\nheld for the whole lifetime of the worker thread. This makes sure the\nconfig cannot be freed while recv_work is still running, even if clear\n+ reconfigure interleave.\n\nIn addition, we don\u0027t need to worry about recv_work dropping the last\nnbd_put (which causes deadlock):\n\npath A (netlink with NBD_CFLAG_DESTROY_ON_DISCONNECT):\n  connect  // nbd_refs=1 (trigger recv_work)\n  open nbd // nbd_refs=2\n  NBD_CLEAR_SOCK\n  close nbd\n    nbd_release\n      nbd_disconnect_and_put\n        flush_workqueue // recv_work done\n      nbd_config_put\n        nbd_put // nbd_refs=1\n      nbd_put // nbd_refs=0\n        queue_work\n\npath B (netlink without NBD_CFLAG_DESTROY_ON_DISCONNECT):\n  connect  // nbd_refs=2 (trigger recv_work)\n  open nbd // nbd_refs=3\n  NBD_CLEAR_SOCK // conf_refs=2\n  close nbd\n    nbd_release\n      nbd_config_put // conf_refs=1\n      nbd_put // nbd_refs=2\n  recv_work done // conf_refs=0, nbd_refs=1\n  rmmod // nbd_refs=0\n\nDepends-on: e2daec488c57 (\"nbd: Fix hungtask when nbd_config_put\")"
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-05-23T16:02:46.914Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/198aa230a6f8c1f6af7ed26b29180749c3e79e4d"
            },
            {
              "url": "https://git.kernel.org/stable/c/d3ba312675911ff9e3fefefd551751e153a9f0a9"
            },
            {
              "url": "https://git.kernel.org/stable/c/3692884bd6187d89d41eef81e5a9724519fd01c1"
            },
            {
              "url": "https://git.kernel.org/stable/c/1ba2ced2bbdf7e64a30c3e88c70ea8bc208d1509"
            },
            {
              "url": "https://git.kernel.org/stable/c/6b69593f72e1bfba6ca47ca8d9b619341fded7d6"
            },
            {
              "url": "https://git.kernel.org/stable/c/443a1721806b6ff6303b5229e9811d68172d622f"
            },
            {
              "url": "https://git.kernel.org/stable/c/742012f6bf29553fdc460bf646a58df3a7b43d01"
            },
            {
              "url": "https://git.kernel.org/stable/c/9517b82d8d422d426a988b213fdd45c6b417b86d"
            }
          ],
          "title": "nbd: defer config put in recv_work",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-68372",
        "datePublished": "2025-12-24T10:33:02.679Z",
        "dateReserved": "2025-12-16T14:48:05.310Z",
        "dateUpdated": "2026-06-16T19:28:42.649Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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