DEBIAN-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 nvmempathrevalidatepaths(), 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 listdelrcu() to wait for in-progress readers. Add the same grace period in the error path.