Linux Kernel up to 6.18.46/7.1.10/7.2.0 nvmet_pci_epf nvmet_pci_epf_create_cq release of resource

CVSS Meta Temp Score
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CTI Interest Score
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7.2$0-$5k0.44

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.46/7.1.10/7.2.0. It has been rated as critical. The impacted element is the function nvmet_pci_epf_create_cq of the component nvmet_pci_epf. The manipulation leads to release of resource. This vulnerability is uniquely identified as CVE-2026-80821. The attack is possible to be carried out remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.46/7.1.10/7.2.0 and classified as critical. This issue affects the function nvmet_pci_epf_create_cq of the component nvmet_pci_epf. The manipulation with an unknown input leads to a release of resource vulnerability. Using CWE to declare the problem leads to CWE-772. The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed. Impacted is availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2026-80821 since 08/26/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/04/2026). The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 6.18.47, 7.1.11, 7.2.1 or 7.3-rc1 eliminates this vulnerability. Applying the patch f31650243c1ab32394077f234685e89ed8dece84/b5f97fae2503a763fa0f953abf5f121b0fef7d0d/56a7b6a6880dbabe28214ff88df8d229ca3a944a/659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c is able to eliminate this problem.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.2

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Release of resource
CWE: CWE-772 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.47/7.1.11/7.2.1/7.3-rc1
Patch: f31650243c1ab32394077f234685e89ed8dece84/b5f97fae2503a763fa0f953abf5f121b0fef7d0d/56a7b6a6880dbabe28214ff88df8d229ca3a944a/659ae9d02cb5d72c76f74fff7441eb8fb64d8f5c

Timelineinfo

08/26/2026 CVE reserved
09/04/2026 +9 days Advisory disclosed
09/04/2026 +0 days VulDB entry created
09/04/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-80821 (🔒)
GCVE (CVE): GCVE-0-2026-80821
GCVE (VulDB): GCVE-100-398867

Entryinfo

Created: 09/04/2026 17:43
Changes: 09/04/2026 17:43 (59)
Complete: 🔍
Cache ID: 216::103

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