CVE-2026-89972

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/d663944dbad81bb0e3635d7090db4713e6300858
• https://git.kernel.org/stable/c/76023560d60f10b4f808941163aa2975f1631683
• https://git.kernel.org/stable/c/ef248d5de4469fb6bbaf8dbe0c4c47800080d648

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