CVE-2026-23261nvme-fc: release admin tagset if init fails

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/7c54d3f5ebbc5982daaa004260242dc07ac943ea
• https://git.kernel.org/stable/c/fa301aef50e3f3b5be6ee53457608beae5aa7a01
• https://git.kernel.org/stable/c/e810b290922c535feb34bc90ab549446fe94d2a3
• https://git.kernel.org/stable/c/d1877cc7270302081a315a81a0ee8331f19f95c8