{"cve":"CVE-2026-80821","nvd":{"published":"2026-09-04T16:18:09.857","modified":"2026-10-19T09:17:16.970","status":"Received","description":"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.","cvss_v4":null,"cvss_v3":null,"cwes":[],"references":["https://git.kernel.org/stable/c/56a7b6a6880dbabe28214ff88df8d229ca3a944a","https://git.kernel.org/stable/c/659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c","https://git.kernel.org/stable/c/b5f97fae2503a763fa0f953abf5f121b0fef7d0d","https://git.kernel.org/stable/c/f31650243c1ab32394077f234685e89ed8dece84"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:52:03.409947763+00:00"},"epss":{"cve":"CVE-2026-80821","score":0.00209,"percentile":0.10952,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}