CVE-2026-80821

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.