CVE-2025-40343 (GCVE-0-2025-40343)

Vulnerability from cvelistv5 – Published: 2025-12-09 04:10 – Updated: 2026-10-15 22:02
VLAI
Title
nvmet-fc: avoid scheduling association deletion twice
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet-fc: avoid scheduling association deletion twice When forcefully shutting down a port via the configfs interface, nvmet_port_subsys_drop_link() first calls nvmet_port_del_ctrls() and then nvmet_disable_port(). Both functions will eventually schedule all remaining associations for deletion. The current implementation checks whether an association is about to be removed, but only after the work item has already been scheduled. As a result, it is possible for the first scheduled work item to free all resources, and then for the same work item to be scheduled again for deletion. Because the association list is an RCU list, it is not possible to take a lock and remove the list entry directly, so it cannot be looked up again. Instead, a flag (terminating) must be used to determine whether the association is already in the process of being deleted.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-15 21:59 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: a07b4970f464f13640e28e16dad6cfa33647cc99 , < 2f4852db87e25d4e226b25cb6f652fef9504360e (git)
Affected: a07b4970f464f13640e28e16dad6cfa33647cc99 , < 85e2ce1920cb511d57aae59f0df6ff85b28bf04d (git)
Affected: a07b4970f464f13640e28e16dad6cfa33647cc99 , < 601ed47b2363c24d948d7bac0c23abc8bd459570 (git)
Affected: a07b4970f464f13640e28e16dad6cfa33647cc99 , < 04d17540ef51e2c291eb863ca87fd332259b2d40 (git)
Affected: a07b4970f464f13640e28e16dad6cfa33647cc99 , < c09ac9a63fc3aaf4670ad7b5e4f5afd764424154 (git)
Affected: a07b4970f464f13640e28e16dad6cfa33647cc99 , < f2537be4f8421f6495edfa0bc284d722f253841d (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.8
Unaffected: 0 , < 4.8 (semver)
Unaffected: 5.15.197 , ≤ 5.15.* (semver)
Unaffected: 6.1.159 , ≤ 6.1.* (semver)
Unaffected: 6.6.117 , ≤ 6.6.* (semver)
Unaffected: 6.12.58 , ≤ 6.12.* (semver)
Unaffected: 6.17.8 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2025-40343",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:59:32.826461Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-15T22:02:46.366Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/target/fc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "2f4852db87e25d4e226b25cb6f652fef9504360e",
              "status": "affected",
              "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
              "versionType": "git"
            },
            {
              "lessThan": "85e2ce1920cb511d57aae59f0df6ff85b28bf04d",
              "status": "affected",
              "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
              "versionType": "git"
            },
            {
              "lessThan": "601ed47b2363c24d948d7bac0c23abc8bd459570",
              "status": "affected",
              "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
              "versionType": "git"
            },
            {
              "lessThan": "04d17540ef51e2c291eb863ca87fd332259b2d40",
              "status": "affected",
              "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
              "versionType": "git"
            },
            {
              "lessThan": "c09ac9a63fc3aaf4670ad7b5e4f5afd764424154",
              "status": "affected",
              "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
              "versionType": "git"
            },
            {
              "lessThan": "f2537be4f8421f6495edfa0bc284d722f253841d",
              "status": "affected",
              "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/target/fc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.8"
            },
            {
              "lessThan": "4.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.197",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.159",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.117",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.197",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.159",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.117",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.58",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.17.8",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18",
                  "versionStartIncluding": "4.8",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-fc: avoid scheduling association deletion twice\n\nWhen forcefully shutting down a port via the configfs interface,\nnvmet_port_subsys_drop_link() first calls nvmet_port_del_ctrls() and\nthen nvmet_disable_port(). Both functions will eventually schedule all\nremaining associations for deletion.\n\nThe current implementation checks whether an association is about to be\nremoved, but only after the work item has already been scheduled. As a\nresult, it is possible for the first scheduled work item to free all\nresources, and then for the same work item to be scheduled again for\ndeletion.\n\nBecause the association list is an RCU list, it is not possible to take\na lock and remove the list entry directly, so it cannot be looked up\nagain. Instead, a flag (terminating) must be used to determine whether\nthe association is already in the process of being deleted."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The vulnerable association-deletion path is driven by FC-NVMe Link Service frames (Create/Disconnect Association) received from a remote host port by the nvmet-fc target, and by remote-controlled events such as keep-alive expiry and fabric logout; like the sibling nvmet-tcp transport, this is remote-peer protocol data, and FC/FCoE fabrics are multi-hop and extendable over FCIP rather than limited to one physical segment.\nAC:L - The attacker controls both racers \u2014 it can issue duplicate Disconnect Association LSs concurrently, choose a short KATO so the keep-alive timeout fires on demand, or drop its fabric login \u2014 and the window is wide because the first work item sits in `synchronize_rcu()` plus `flush_workqueue()` with `WORK_STRUCT_PENDING` already cleared; the sequence can be retried indefinitely across many associations.\nPR:N - `nvmet_fc_ls_create_association()` and `nvmet_fc_ls_disconnect()` perform no host-NQN or allowed-host validation \u2014 the NQN check only occurs later in the NVMe fabrics Connect command \u2014 so an unauthenticated host port on the fabric can create and tear down associations; FC zoning is network access control, not a privilege of the vulnerable component.\nUI:N - The attacking host issues the LS frames and controls the timing entirely on its own; no action by an administrator or any other user is required.\nS:U - The use-after-free and double free corrupt kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After `kfree(assoc)` the re-queued work re-enters `nvmet_fc_target_assoc_free()`, which reads `association_id`, `hostport`, `rcv_disconn` and `queues[]` from the reclaimed slab object and transmits a Disconnect LS/LS response built from that memory back to the remote host, leaking attacker-reclaimable kernel heap contents and giving attacker-directed reads.\nI:H - The `work_struct` lives inside the freed allocation, so the workqueue writes into reclaimed memory and dispatches through a `work-\u003efunc` taken from it, and the second `kref_put()` causes a refcount underflow and double free of `assoc`, `hostport` and the queue objects \u2014 a control-flow-hijack and arbitrary-free primitive.\nA:H - Even without weaponization, the second execution performs `list_del_rcu` and `spin_lock` on freed memory and double-frees the association, reliably producing list corruption, a KASAN splat, or a kernel panic on the storage target."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:09:45.994Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/2f4852db87e25d4e226b25cb6f652fef9504360e"
        },
        {
          "url": "https://git.kernel.org/stable/c/85e2ce1920cb511d57aae59f0df6ff85b28bf04d"
        },
        {
          "url": "https://git.kernel.org/stable/c/601ed47b2363c24d948d7bac0c23abc8bd459570"
        },
        {
          "url": "https://git.kernel.org/stable/c/04d17540ef51e2c291eb863ca87fd332259b2d40"
        },
        {
          "url": "https://git.kernel.org/stable/c/c09ac9a63fc3aaf4670ad7b5e4f5afd764424154"
        },
        {
          "url": "https://git.kernel.org/stable/c/f2537be4f8421f6495edfa0bc284d722f253841d"
        }
      ],
      "title": "nvmet-fc: avoid scheduling association deletion twice",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-40343",
    "datePublished": "2025-12-09T04:10:00.973Z",
    "dateReserved": "2025-04-16T07:20:57.187Z",
    "dateUpdated": "2026-10-15T22:02:46.366Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2025-40343",
      "date": "2026-10-29",
      "epss": "0.00651",
      "percentile": "0.51088"
    },
    "nvd": {
      "cve": {
        "affected": [
          {
            "affectedData": [
              {
                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/nvme/target/fc.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "lessThan": "2f4852db87e25d4e226b25cb6f652fef9504360e",
                    "status": "affected",
                    "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "85e2ce1920cb511d57aae59f0df6ff85b28bf04d",
                    "status": "affected",
                    "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "601ed47b2363c24d948d7bac0c23abc8bd459570",
                    "status": "affected",
                    "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "04d17540ef51e2c291eb863ca87fd332259b2d40",
                    "status": "affected",
                    "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "c09ac9a63fc3aaf4670ad7b5e4f5afd764424154",
                    "status": "affected",
                    "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                    "versionType": "git"
                  },
                  {
                    "lessThan": "f2537be4f8421f6495edfa0bc284d722f253841d",
                    "status": "affected",
                    "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/nvme/target/fc.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "4.8"
                  },
                  {
                    "lessThan": "4.8",
                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "5.15.*",
                    "status": "unaffected",
                    "version": "5.15.197",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.1.*",
                    "status": "unaffected",
                    "version": "6.1.159",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.6.*",
                    "status": "unaffected",
                    "version": "6.6.117",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.58",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.17.*",
                    "status": "unaffected",
                    "version": "6.17.8",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "*",
                    "status": "unaffected",
                    "version": "6.18",
                    "versionType": "original_commit_for_fix"
                  }
                ]
              }
            ],
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-fc: avoid scheduling association deletion twice\n\nWhen forcefully shutting down a port via the configfs interface,\nnvmet_port_subsys_drop_link() first calls nvmet_port_del_ctrls() and\nthen nvmet_disable_port(). Both functions will eventually schedule all\nremaining associations for deletion.\n\nThe current implementation checks whether an association is about to be\nremoved, but only after the work item has already been scheduled. As a\nresult, it is possible for the first scheduled work item to free all\nresources, and then for the same work item to be scheduled again for\ndeletion.\n\nBecause the association list is an RCU list, it is not possible to take\na lock and remove the list entry directly, so it cannot be looked up\nagain. Instead, a flag (terminating) must be used to determine whether\nthe association is already in the process of being deleted."
          },
          {
            "lang": "es",
            "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnvmet-fc: evitar programar la eliminaci\u00f3n de asociaciones dos veces\n\nAl apagar forzosamente un puerto a trav\u00e9s de la interfaz configfs, nvmet_port_subsys_drop_link() primero llama a nvmet_port_del_ctrls() y luego a nvmet_disable_port(). Ambas funciones eventualmente programar\u00e1n todas las asociaciones restantes para su eliminaci\u00f3n.\n\nLa implementaci\u00f3n actual verifica si una asociaci\u00f3n est\u00e1 a punto de ser eliminada, pero solo despu\u00e9s de que el elemento de trabajo ya ha sido programado. Como resultado, es posible que el primer elemento de trabajo programado libere todos los recursos, y luego que el mismo elemento de trabajo sea programado nuevamente para su eliminaci\u00f3n.\n\nDebido a que la lista de asociaciones es una lista RCU, no es posible tomar un bloqueo y eliminar la entrada de la lista directamente, por lo que no se puede buscar de nuevo. En su lugar, una bandera (terminating) debe usarse para determinar si la asociaci\u00f3n ya est\u00e1 en proceso de ser eliminada."
          }
        ],
        "id": "CVE-2025-40343",
        "lastModified": "2026-10-15T22:19:08.927",
        "metrics": {
          "cvssMetricV31": [
            {
              "cvssData": {
                "attackComplexity": "LOW",
                "attackVector": "NETWORK",
                "availabilityImpact": "HIGH",
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "NONE",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "exploitabilityScore": 3.9,
              "impactScore": 5.9,
              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
            }
          ],
          "ssvcV203": [
            {
              "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "ssvcData": {
                "id": "CVE-2025-40343",
                "options": [
                  {
                    "exploitation": "none"
                  },
                  {
                    "automatable": "yes"
                  },
                  {
                    "technicalImpact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-15T21:59:32.826461Z",
                "version": "2.0.3"
              }
            }
          ]
        },
        "published": "2025-12-09T16:17:44.650",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/04d17540ef51e2c291eb863ca87fd332259b2d40"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/2f4852db87e25d4e226b25cb6f652fef9504360e"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/601ed47b2363c24d948d7bac0c23abc8bd459570"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/85e2ce1920cb511d57aae59f0df6ff85b28bf04d"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/c09ac9a63fc3aaf4670ad7b5e4f5afd764424154"
          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/f2537be4f8421f6495edfa0bc284d722f253841d"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Deferred"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-21T02:29:55+00:00",
      "cve": "CVE-2025-40343",
      "id": "CVE-2025-40343",
      "initial_release_date": "2025-12-09T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:known_not_affected": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvmet-fc: avoid scheduling association deletion twice",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-40343.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-16T12:51:35Z",
      "cve": "CVE-2025-40343",
      "id": "CVE-2025-40343",
      "initial_release_date": "2025-12-10T00:26:21Z",
      "product_status:known_affected": "463",
      "product_status:known_not_affected": "365",
      "product_status:recommended": "415",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-40343",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2025/cve-2025-40343.json",
      "version": "45"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2025-40343",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-15T21:59:32.826461Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-15T21:59:33.783Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
          "affected": [
            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
                "drivers/nvme/target/fc.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "lessThan": "2f4852db87e25d4e226b25cb6f652fef9504360e",
                  "status": "affected",
                  "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                  "versionType": "git"
                },
                {
                  "lessThan": "85e2ce1920cb511d57aae59f0df6ff85b28bf04d",
                  "status": "affected",
                  "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                  "versionType": "git"
                },
                {
                  "lessThan": "601ed47b2363c24d948d7bac0c23abc8bd459570",
                  "status": "affected",
                  "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                  "versionType": "git"
                },
                {
                  "lessThan": "04d17540ef51e2c291eb863ca87fd332259b2d40",
                  "status": "affected",
                  "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                  "versionType": "git"
                },
                {
                  "lessThan": "c09ac9a63fc3aaf4670ad7b5e4f5afd764424154",
                  "status": "affected",
                  "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                  "versionType": "git"
                },
                {
                  "lessThan": "f2537be4f8421f6495edfa0bc284d722f253841d",
                  "status": "affected",
                  "version": "a07b4970f464f13640e28e16dad6cfa33647cc99",
                  "versionType": "git"
                }
              ]
            },
            {
              "defaultStatus": "affected",
              "product": "Linux",
              "programFiles": [
                "drivers/nvme/target/fc.c"
              ],
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
                {
                  "status": "affected",
                  "version": "4.8"
                },
                {
                  "lessThan": "4.8",
                  "status": "unaffected",
                  "version": "0",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "5.15.*",
                  "status": "unaffected",
                  "version": "5.15.197",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.1.*",
                  "status": "unaffected",
                  "version": "6.1.159",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.117",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.12.*",
                  "status": "unaffected",
                  "version": "6.12.58",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.17.*",
                  "status": "unaffected",
                  "version": "6.17.8",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.18",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.197",
                      "versionStartIncluding": "4.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.159",
                      "versionStartIncluding": "4.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.117",
                      "versionStartIncluding": "4.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.12.58",
                      "versionStartIncluding": "4.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.17.8",
                      "versionStartIncluding": "4.8",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.18",
                      "versionStartIncluding": "4.8",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-fc: avoid scheduling association deletion twice\n\nWhen forcefully shutting down a port via the configfs interface,\nnvmet_port_subsys_drop_link() first calls nvmet_port_del_ctrls() and\nthen nvmet_disable_port(). Both functions will eventually schedule all\nremaining associations for deletion.\n\nThe current implementation checks whether an association is about to be\nremoved, but only after the work item has already been scheduled. As a\nresult, it is possible for the first scheduled work item to free all\nresources, and then for the same work item to be scheduled again for\ndeletion.\n\nBecause the association list is an RCU list, it is not possible to take\na lock and remove the list entry directly, so it cannot be looked up\nagain. Instead, a flag (terminating) must be used to determine whether\nthe association is already in the process of being deleted."
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 9.8,
                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The vulnerable association-deletion path is driven by FC-NVMe Link Service frames (Create/Disconnect Association) received from a remote host port by the nvmet-fc target, and by remote-controlled events such as keep-alive expiry and fabric logout; like the sibling nvmet-tcp transport, this is remote-peer protocol data, and FC/FCoE fabrics are multi-hop and extendable over FCIP rather than limited to one physical segment.\nAC:L - The attacker controls both racers \u2014 it can issue duplicate Disconnect Association LSs concurrently, choose a short KATO so the keep-alive timeout fires on demand, or drop its fabric login \u2014 and the window is wide because the first work item sits in `synchronize_rcu()` plus `flush_workqueue()` with `WORK_STRUCT_PENDING` already cleared; the sequence can be retried indefinitely across many associations.\nPR:N - `nvmet_fc_ls_create_association()` and `nvmet_fc_ls_disconnect()` perform no host-NQN or allowed-host validation \u2014 the NQN check only occurs later in the NVMe fabrics Connect command \u2014 so an unauthenticated host port on the fabric can create and tear down associations; FC zoning is network access control, not a privilege of the vulnerable component.\nUI:N - The attacking host issues the LS frames and controls the timing entirely on its own; no action by an administrator or any other user is required.\nS:U - The use-after-free and double free corrupt kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - After `kfree(assoc)` the re-queued work re-enters `nvmet_fc_target_assoc_free()`, which reads `association_id`, `hostport`, `rcv_disconn` and `queues[]` from the reclaimed slab object and transmits a Disconnect LS/LS response built from that memory back to the remote host, leaking attacker-reclaimable kernel heap contents and giving attacker-directed reads.\nI:H - The `work_struct` lives inside the freed allocation, so the workqueue writes into reclaimed memory and dispatches through a `work-\u003efunc` taken from it, and the second `kref_put()` causes a refcount underflow and double free of `assoc`, `hostport` and the queue objects \u2014 a control-flow-hijack and arbitrary-free primitive.\nA:H - Even without weaponization, the second execution performs `list_del_rcu` and `spin_lock` on freed memory and double-frees the association, reliably producing list corruption, a KASAN splat, or a kernel panic on the storage target."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T12:09:45.994Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/2f4852db87e25d4e226b25cb6f652fef9504360e"
            },
            {
              "url": "https://git.kernel.org/stable/c/85e2ce1920cb511d57aae59f0df6ff85b28bf04d"
            },
            {
              "url": "https://git.kernel.org/stable/c/601ed47b2363c24d948d7bac0c23abc8bd459570"
            },
            {
              "url": "https://git.kernel.org/stable/c/04d17540ef51e2c291eb863ca87fd332259b2d40"
            },
            {
              "url": "https://git.kernel.org/stable/c/c09ac9a63fc3aaf4670ad7b5e4f5afd764424154"
            },
            {
              "url": "https://git.kernel.org/stable/c/f2537be4f8421f6495edfa0bc284d722f253841d"
            }
          ],
          "title": "nvmet-fc: avoid scheduling association deletion twice",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2025-40343",
        "datePublished": "2025-12-09T04:10:00.973Z",
        "dateReserved": "2025-04-16T07:20:57.187Z",
        "dateUpdated": "2026-10-15T22:02:46.366Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



Log in or create an account to share your comment.




Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Loading timeline…




    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.