CVE-2025-40343

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

nvmet-fc: avoid scheduling association deletion twice

When forcefully shutting down a port via the configfs interface,

nvmet_port_subsys_drop_link() first calls nvmet_port_del_ctrls() and

then nvmet_disable_port(). Both functions will eventually schedule all

remaining associations for deletion.

The current implementation checks whether an association is about to be

removed, but only after the work item has already been scheduled. As a

result, it is possible for the first scheduled work item to free all

resources, and then for the same work item to be scheduled again for

deletion.

Because the association list is an RCU list, it is not possible to take

a lock and remove the list entry directly, so it cannot be looked up

again. Instead, a flag (terminating) must be used to determine whether

the association is already in the process of being deleted.

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References