CVE-2026-80821

In the Linux kernel, the following vulnerability has been resolved:

nvmet: pci-epf: put CQ ref on create_cq mapping failure

nvmetpciepfcreatecq() calls nvmetcqcreate(), 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 errinternal / errunmapqueue without calling nvmetcqput(). The matching put in nvmetpciepfdeletecq() is gated on NVMETPCIEPFQLIVE, 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/pciaddr therefore leaks the CQ and a controller reference on each attempt.

Drop the CQ reference on the mapping-failure paths. The errinternal and errunmapqueue labels are only reachable after nvmetcq_create() has succeeded, so this pairs the create/put correctly.