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

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Summary

CVECVE-2026-80821
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-04 16:18:09 UTC
Updated2026-09-04 16:18:09 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.001680000 probability, percentile 0.063060000 (date 2026-09-07)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 f31650243c1ab32394077f234685e89ed8dece84 git Not specified
CNA Linux Linux affected 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 b5f97fae2503a763fa0f953abf5f121b0fef7d0d git Not specified
CNA Linux Linux affected 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 56a7b6a6880dbabe28214ff88df8d229ca3a944a git Not specified
CNA Linux Linux affected 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c git Not specified
CNA Linux Linux affected 6.14 Not specified
CNA Linux Linux unaffected 6.14 semver Not specified
CNA Linux Linux unaffected 6.18.47 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.11 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2.1 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b5f97fae2503a763fa0f953abf5f121b0fef7d0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/56a7b6a6880dbabe28214ff88df8d229ca3a944a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f31650243c1ab32394077f234685e89ed8dece84 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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