---
id: CVE-2026-80821
title: 'nvmet: pci-epf: put CQ ref on create_cq mapping failure'
summary: |-
  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 c…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 <
    f31650243c1ab32394077f234685e89ed8dece84
  - >-
    Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 <
    b5f97fae2503a763fa0f953abf5f121b0fef7d0d
  - >-
    Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 <
    56a7b6a6880dbabe28214ff88df8d229ca3a944a
  - >-
    Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 <
    659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c
  - Linux 6.14
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:44:13.912Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80821'
references:
  - url: 'https://git.kernel.org/stable/c/f31650243c1ab32394077f234685e89ed8dece84'
  - url: 'https://git.kernel.org/stable/c/b5f97fae2503a763fa0f953abf5f121b0fef7d0d'
  - url: 'https://git.kernel.org/stable/c/56a7b6a6880dbabe28214ff88df8d229ca3a944a'
  - url: 'https://git.kernel.org/stable/c/659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c'
tags:
  - cve.org
epss: 0.00209
epssPercentile: 0.10306
ingestedAt: '2026-10-19T09:16:01.504Z'
---

## Overview

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.

## Affected

- `Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < f31650243c1ab32394077f234685e89ed8dece84`
- `Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < b5f97fae2503a763fa0f953abf5f121b0fef7d0d`
- `Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < 56a7b6a6880dbabe28214ff88df8d229ca3a944a`
- `Linux >= 0faa0fe6f90ea59b10d1b0f15ce0eb0c18eff186 < 659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c`
- `Linux 6.14`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.