{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "3dcfe0de5a9752e646a61f4ce513ac059960c7c3"
            },
            {
              "fixed": "07776b7779c9426982c1ad74aad91bd531593790"
            },
            {
              "fixed": "29f126f09e34a425b376b3646c89aa7cc18b142c"
            },
            {
              "fixed": "163bd704d7515c3df6c2e03bcba93d1db79edbff"
            },
            {
              "fixed": "ee57b89e5da9fffbe0d26647e4ff0750dacb9943"
            },
            {
              "fixed": "35461d23744175a78b6280293892cca357c22793"
            },
            {
              "fixed": "bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770"
            },
            {
              "fixed": "a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.210"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.176"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.143"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.93"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.35"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63889.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: scsi_transport_fc: Widen FPIN pname walker counter to u32\n\nAn adjacent Fibre Channel fabric actor that can deliver an FPIN ELS\nframe to an lpfc or qla2xxx Linux initiator can trigger a non-return in\nthe generic FC transport. This is not a local userspace or IP network\npath; the attacker must be able to inject fabric traffic, for example as\na compromised switch or fabric controller, or as a same-zone N_Port on a\nfabric that permits source spoofing.\n\nThe Link-Integrity and Peer-Congestion FPIN walkers used a u8 loop\ncounter against the 32-bit on-wire pname_count field, and did not bound\npname_count by the descriptor body already validated by the TLV walker.\nA pname_count of 256 therefore wraps the counter and keeps the loop\ncondition true indefinitely.\n\nFactor the shared pname_list[] walk into one helper, widen the counter\nto u32, and clamp pname_count against the entries that fit in the\ndescriptor body before iterating.",
  "id": "CVE-2026-63889",
  "modified": "2026-07-22T05:29:58.361574078Z",
  "published": "2026-07-19T14:55:01.515Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07776b7779c9426982c1ad74aad91bd531593790"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/163bd704d7515c3df6c2e03bcba93d1db79edbff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/29f126f09e34a425b376b3646c89aa7cc18b142c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/35461d23744175a78b6280293892cca357c22793"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a9a39233ec1fc9f97ea1340a4d09bb7ec2be5153"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bdff76dff6ec23d6fe35812fa33e5c4ce2cdb770"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ee57b89e5da9fffbe0d26647e4ff0750dacb9943"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63889.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63889"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "scsi: scsi_transport_fc: Widen FPIN pname walker counter to u32"
}