{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186"
            },
            {
              "fixed": "f31650243c1ab32394077f234685e89ed8dece84"
            },
            {
              "fixed": "b5f97fae2503a763fa0f953abf5f121b0fef7d0d"
            },
            {
              "fixed": "56a7b6a6880dbabe28214ff88df8d229ca3a944a"
            },
            {
              "fixed": "659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.14.0"
            },
            {
              "fixed": "6.18.47"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.11"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80821.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: pci-epf: put CQ ref on create_cq mapping failure\n\nnvmet_pci_epf_create_cq() calls nvmet_cq_create(), which takes a\nreference on the controller and installs the completion queue. If the\nsubsequent PCI address-space mapping fails or returns a too-small partial\nmapping, the function jumps to err_internal / err_unmap_queue without\ncalling nvmet_cq_put(). The matching put in nvmet_pci_epf_delete_cq() is\ngated on NVMET_PCI_EPF_Q_LIVE, which is only set after the mapping\nsucceeds, so teardown never releases these references. A remote PCI host\nthat drives Create IO CQ commands with a failing PRP1/pci_addr therefore\nleaks the CQ and a controller reference on each attempt.\n\nDrop the CQ reference on the mapping-failure paths. The err_internal and\nerr_unmap_queue labels are only reachable after nvmet_cq_create() has\nsucceeded, so this pairs the create/put correctly.",
  "id": "CVE-2026-80821",
  "modified": "2026-09-06T03:30:22.608892534Z",
  "published": "2026-09-04T15:27:42.612Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/56a7b6a6880dbabe28214ff88df8d229ca3a944a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b5f97fae2503a763fa0f953abf5f121b0fef7d0d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f31650243c1ab32394077f234685e89ed8dece84"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80821.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80821"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "nvmet: pci-epf: put CQ ref on create_cq mapping failure"
}