---
id: CVE-2026-89972
title: |-
  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->s…
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->s…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= ed754e5deeb17f4e675c84e4b6c640cc7344e498 <
    d663944dbad81bb0e3635d7090db4713e6300858
  - >-
    Linux >= ed754e5deeb17f4e675c84e4b6c640cc7344e498 <
    76023560d60f10b4f808941163aa2975f1631683
  - >-
    Linux >= ed754e5deeb17f4e675c84e4b6c640cc7344e498 <
    ef248d5de4469fb6bbaf8dbe0c4c47800080d648
  - Linux 4.15
published: '2026-09-16'
updated: '2026-09-16'
sourceUpdated: '2026-09-16T15:18:21.637'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89972'
references:
  - url: 'https://git.kernel.org/stable/c/76023560d60f10b4f808941163aa2975f1631683'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d663944dbad81bb0e3635d7090db4713e6300858'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ef248d5de4469fb6bbaf8dbe0c4c47800080d648'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-16T10:53:53.956Z'
epss: 0.00598
epssPercentile: 0.47303
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.