In the Linux kernel, the following vulnerability has been resolved: nvme-fc: release admin tagset if init fails nvme_fabrics creates an NVMe/FC… (CVE-2026-23261)
A vulnerability in the Linux kernel NVMe over Fibre Channel (nvme-fc) subsystem was resolved that involved a resource leak when initializing the NVMe/FC controller fails. Specifically, if the admin tagset allocation succeeds but subsequent initialization steps fail, the admin tagset was not freed, causing a memory leak. This issue was fixed by ensuring the admin tagset is released on failure during controller setup. The vulnerability has a CVSS score of 5.5 (medium severity) with no confidentiality or integrity impact but with potential availability impact due to resource leakage. A patch is available and included in Linux kernel versions 6.8.0 and later. Users should update to patched kernel versions to remediate this issue.
AI Analysis
Technical Summary
The vulnerability (CVE-2026-23261) in the Linux kernel's nvme-fc driver occurs during NVMe/FC controller initialization. The function nvme_fc_init_ctrl() allocates admin blk-mq resources after nvme_add_ctrl() succeeds. If subsequent steps fail, the fail_ctrl path tears down controller references but does not free the admin queue/tag set, causing a memory leak. The fix adds a check for ctrl->ctrl.admin_tagset in the fail_ctrl path and calls nvme_remove_admin_tag_set() to free allocated resources on failure, preventing the leak. This issue was reported in Ubuntu advisories and fixed in kernel versions 6.8.0-1057.60~22.04.1 and later.
Potential Impact
The vulnerability causes a memory leak in the NVMe/FC controller initialization path, which can lead to resource exhaustion and potential denial of service (availability impact). There is no impact on confidentiality or integrity. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating local attack vector with low complexity and low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Mitigation Recommendations
A patch is available and has been released in Linux kernel versions 6.8.0-1057.60~22.04.1 and later. Users should update their Linux kernel to these or newer versions to apply the official fix. After updating, a system reboot is required to complete remediation. No additional mitigation steps are indicated by the vendor advisory.
In the Linux kernel, the following vulnerability has been resolved: nvme-fc: release admin tagset if init fails nvme_fabrics creates an NVMe/FC… (CVE-2026-23261)
Description
A vulnerability in the Linux kernel NVMe over Fibre Channel (nvme-fc) subsystem was resolved that involved a resource leak when initializing the NVMe/FC controller fails. Specifically, if the admin tagset allocation succeeds but subsequent initialization steps fail, the admin tagset was not freed, causing a memory leak. This issue was fixed by ensuring the admin tagset is released on failure during controller setup. The vulnerability has a CVSS score of 5.5 (medium severity) with no confidentiality or integrity impact but with potential availability impact due to resource leakage. A patch is available and included in Linux kernel versions 6.8.0 and later. Users should update to patched kernel versions to remediate this issue.
CVSS v3.1
Score 5.5medium
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability (CVE-2026-23261) in the Linux kernel's nvme-fc driver occurs during NVMe/FC controller initialization. The function nvme_fc_init_ctrl() allocates admin blk-mq resources after nvme_add_ctrl() succeeds. If subsequent steps fail, the fail_ctrl path tears down controller references but does not free the admin queue/tag set, causing a memory leak. The fix adds a check for ctrl->ctrl.admin_tagset in the fail_ctrl path and calls nvme_remove_admin_tag_set() to free allocated resources on failure, preventing the leak. This issue was reported in Ubuntu advisories and fixed in kernel versions 6.8.0-1057.60~22.04.1 and later.
Potential Impact
The vulnerability causes a memory leak in the NVMe/FC controller initialization path, which can lead to resource exhaustion and potential denial of service (availability impact). There is no impact on confidentiality or integrity. The CVSS 3.1 vector is AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H, indicating local attack vector with low complexity and low privileges required, no user interaction, unchanged scope, no confidentiality or integrity impact, and high availability impact.
Mitigation Recommendations
A patch is available and has been released in Linux kernel versions 6.8.0-1057.60~22.04.1 and later. Users should update their Linux kernel to these or newer versions to apply the official fix. After updating, a system reboot is required to complete remediation. No additional mitigation steps are indicated by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23261
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 3.1
Threat ID: 6a5b62e72d1edb114c8a2fe6
Added to database: 07/18/2026, 11:26:31 UTC
Last enriched: 08/01/2026, 06:55:03 UTC
Last updated: 09/14/2026, 22:01:32 UTC
Views: 23
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