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CVE-2026-80821 (GCVE-0-2026-80821)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:27 – Updated: 2026-09-04 15:29
VLAI
Title
nvmet: pci-epf: put CQ ref on create_cq mapping failure
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet: pci-epf: put CQ ref on create_cq mapping failure nvmet_pci_epf_create_cq() calls nvmet_cq_create(), which takes a reference on the controller and installs the completion queue. If the subsequent PCI address-space mapping fails or returns a too-small partial mapping, the function jumps to err_internal / err_unmap_queue without calling nvmet_cq_put(). The matching put in nvmet_pci_epf_delete_cq() is gated on NVMET_PCI_EPF_Q_LIVE, which is only set after the mapping succeeds, so teardown never releases these references. A remote PCI host that drives Create IO CQ commands with a failing PRP1/pci_addr therefore leaks the CQ and a controller reference on each attempt. Drop the CQ reference on the mapping-failure paths. The err_internal and err_unmap_queue labels are only reachable after nvmet_cq_create() has succeeded, so this pairs the create/put correctly.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < f31650243c1ab32394077f234685e89ed8dece84 (git)
Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < b5f97fae2503a763fa0f953abf5f121b0fef7d0d (git)
Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < 56a7b6a6880dbabe28214ff88df8d229ca3a944a (git)
Affected: 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 , < 659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c (git)
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Linux Linux Affected: 6.14
Unaffected: 0 , < 6.14 (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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        {
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          "product": "Linux",
          "programFiles": [
            "drivers/nvme/target/pci-epf.c"
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              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
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          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-04T15:29:15.738Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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        },
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        },
        {
          "url": "https://git.kernel.org/stable/c/659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c"
        }
      ],
      "title": "nvmet: pci-epf: put CQ ref on create_cq mapping failure",
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-80821",
    "datePublished": "2026-09-04T15:27:42.612Z",
    "dateReserved": "2026-08-26T14:34:25.795Z",
    "dateUpdated": "2026-09-04T15:29:15.738Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
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      "epss": "0.00168",
      "percentile": "0.06375"
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    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-10T01:51:05Z",
      "cve": "CVE-2026-80821",
      "id": "CVE-2026-80821",
      "initial_release_date": "2026-09-08T17:16:52Z",
      "product_status:known_affected": "17",
      "product_status:known_not_affected": "324",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80821",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80821.json",
      "version": "3"
    }
  }
}



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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

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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.


Detection rules are retrieved from Rulezet.