CVE-2026-80821
Dashboard / Vulnerabilities / 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: 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.
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, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80821.json, https://nvd.nist.gov/vuln/detail/CVE-2026-80821, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected packages
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