{"id":"CVE-2026-80821","summary":"nvmet: pci-epf: put CQ ref on create_cq mapping failure","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.","modified":"2026-09-06T03:46:49.371669236Z","published":"2026-09-04T15:27:42.612Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80821.json"},"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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186"},{"fixed":"f31650243c1ab32394077f234685e89ed8dece84"},{"fixed":"b5f97fae2503a763fa0f953abf5f121b0fef7d0d"},{"fixed":"56a7b6a6880dbabe28214ff88df8d229ca3a944a"},{"fixed":"659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80821.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","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"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80821.json"}}],"schema_version":"1.9.0"}