Linux Kernel up to 6.1.162/6.6.123/6.12.69/6.18.9 nvme-fc nvmf_dev_write allocation of resources

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Linux Kernel up to 6.1.162/6.6.123/6.12.69/6.18.9. This issue affects the function nvmf_dev_write of the component nvme-fc. The manipulation results in allocation of resources. This vulnerability is cataloged as CVE-2026-23261. There is no exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.162/6.6.123/6.12.69/6.18.9. It has been classified as critical. Affected is the function nvmf_dev_write of the component nvme-fc. The manipulation with an unknown input leads to a allocation of resources vulnerability. CWE is classifying the issue as CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: nvme-fc: release admin tagset if init fails nvme_fabrics creates an NVMe/FC controller in following path: nvmf_dev_write() -> nvmf_create_ctrl() -> nvme_fc_create_ctrl() -> nvme_fc_init_ctrl() nvme_fc_init_ctrl() allocates the admin blk-mq resources right after nvme_add_ctrl() succeeds. If any of the subsequent steps fail (changing the controller state, scheduling connect work, etc.), we jump to the fail_ctrl path, which tears down the controller references but never frees the admin queue/tag set. The leaked blk-mq allocations match the kmemleak report seen during blktests nvme/fc. Check ctrl->ctrl.admin_tagset in the fail_ctrl path and call nvme_remove_admin_tag_set() when it is set so that all admin queue allocations are reclaimed whenever controller setup aborts.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-23261 since 01/13/2026. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 315738 (Ubuntu 22.04 LTS / 24.04 LTS : Linux kernel vulnerabilities (USN-8278-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.163, 6.6.124, 6.12.70 or 6.18.10 eliminates this vulnerability. Applying the patch b134dead095bc5a58fa2b98b90ae93428cb4b328/7c54d3f5ebbc5982daaa004260242dc07ac943ea/fa301aef50e3f3b5be6ee53457608beae5aa7a01/e810b290922c535feb34bc90ab549446fe94d2a3/d1877cc7270302081a315a81a0ee8331f19f95c8 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (315738) and CERT Bund (WID-SEC-2026-0790). Once again VulDB remains the best source for vulnerability data.

Affected

  • Open Source Linux Kernel

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Allocation of resources
CWE: CWE-770 / CWE-400 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 315738
Nessus Name: Ubuntu 22.04 LTS / 24.04 LTS : Linux kernel vulnerabilities (USN-8278-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.163/6.6.124/6.12.70/6.18.10
Patch: b134dead095bc5a58fa2b98b90ae93428cb4b328/7c54d3f5ebbc5982daaa004260242dc07ac943ea/fa301aef50e3f3b5be6ee53457608beae5aa7a01/e810b290922c535feb34bc90ab549446fe94d2a3/d1877cc7270302081a315a81a0ee8331f19f95c8

Timelineinfo

01/13/2026 CVE reserved
03/18/2026 +64 days Advisory disclosed
03/18/2026 +0 days VulDB entry created
05/22/2026 +64 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23261 (🔒)
GCVE (CVE): GCVE-0-2026-23261
GCVE (VulDB): GCVE-100-351564
CERT Bund: WID-SEC-2026-0790 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/18/2026 19:40
Updated: 05/22/2026 00:44
Changes: 03/18/2026 19:40 (59), 03/19/2026 19:45 (7), 03/24/2026 18:41 (1), 05/22/2026 00:44 (2)
Complete: 🔍
Cache ID: 216::103

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