{"id":"CVE-2026-80821","title":"nvmet: pci-epf: put CQ ref on create_cq mapping failure","summary":"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 c…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < f31650243c1ab32394077f234685e89ed8dece84","Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < b5f97fae2503a763fa0f953abf5f121b0fef7d0d","Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < 56a7b6a6880dbabe28214ff88df8d229ca3a944a","Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < 659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c","Linux 6.14"],"published":"2026-09-04","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:44:13.912Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-80821","references":[{"url":"https://git.kernel.org/stable/c/f31650243c1ab32394077f234685e89ed8dece84"},{"url":"https://git.kernel.org/stable/c/b5f97fae2503a763fa0f953abf5f121b0fef7d0d"},{"url":"https://git.kernel.org/stable/c/56a7b6a6880dbabe28214ff88df8d229ca3a944a"},{"url":"https://git.kernel.org/stable/c/659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c"}],"tags":["cve.org"],"epss":0.00209,"epssPercentile":0.10306,"ingestedAt":"2026-10-19T09:16:01.504Z","slug":"CVE-2026-80821","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < f31650243c1ab32394077f234685e89ed8dece84`\n- `Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < b5f97fae2503a763fa0f953abf5f121b0fef7d0d`\n- `Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < 56a7b6a6880dbabe28214ff88df8d229ca3a944a`\n- `Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < 659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c`\n- `Linux 6.14`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}