CVE-2026-89972

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

nvme: add missing SRCU grace period in error path

nvmeallocns() error path at outunlinkns removes ns from the

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

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

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

nvmefindpath() and nvmempathrevalidate_paths(), so a concurrent

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

The normal removal path in nvmensremove() correctly calls

synchronizesrcu(&ns->head->srcu) after listdel_rcu() to wait for

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