CVE-2026-89972

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

nvme: add missing SRCU grace period in error path

nvme_alloc_ns() error path at out_unlink_ns removes ns from the

namespace head siblings list with list_del_rcu(&ns->siblings) but

does not wait for SRCU readers before freeing the namespace struct.

Multipath code iterates the head->list under srcu_read_lock() in

nvme_find_path() and nvme_mpath_revalidate_paths(), so a concurrent

reader can still hold a reference to ns when kfree(ns) runs.

The normal removal path in nvme_ns_remove() correctly calls

synchronize_srcu(&ns->head->srcu) after list_del_rcu() to wait for

in-progress readers. Add the same grace period in the error path.