---
id: CVE-2025-71225
title: 'md: suspend array while updating raid_disks via sysfs'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  md: suspend array while updating raid_disks via sysfs

  In raid1_reshape(), freeze_array() is called before modifying the r1bio
  memory pool (conf->r1bio_pool) and conf->…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e2d59925221cd562e07fee38ec8839f7209ae603 <
    165d1359f945b72c5f90088f60d48ff46115269e
  - >-
    Linux >= e2d59925221cd562e07fee38ec8839f7209ae603 <
    0107b18cd8ac17eb3e54786adc05a85cdbb6ef22
  - >-
    Linux >= e2d59925221cd562e07fee38ec8839f7209ae603 <
    2cc583653bbe050bacd1cadcc9776d39bf449740
  - Linux 1b9203bb4c658c0242afa6fdb025c71d2fc3ad76
  - Linux 8ccf6cfb157419847f3cb2bfdfbcdbd39860e8e9
  - Linux >= 3.4.59 < 3.5
  - Linux >= 3.9.7 < 3.10
  - Linux 3.10
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-06-10T20:41:16.509027Z'
published: '2026-02-18'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T18:25:24.132Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-71225'
references:
  - url: 'https://git.kernel.org/stable/c/165d1359f945b72c5f90088f60d48ff46115269e'
  - url: 'https://git.kernel.org/stable/c/0107b18cd8ac17eb3e54786adc05a85cdbb6ef22'
  - url: 'https://git.kernel.org/stable/c/2cc583653bbe050bacd1cadcc9776d39bf449740'
tags:
  - cve.org
epss: 0.00096
epssPercentile: 0.00678
ingestedAt: '2026-10-19T18:35:50.125Z'
---

## Overview

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

md: suspend array while updating raid_disks via sysfs

In raid1_reshape(), freeze_array() is called before modifying the r1bio
memory pool (conf->r1bio_pool) and conf->raid_disks, and
unfreeze_array() is called after the update is completed.

However, freeze_array() only waits until nr_sync_pending and
(nr_pending - nr_queued) of all buckets reaches zero. When an I/O error
occurs, nr_queued is increased and the corresponding r1bio is queued to
either retry_list or bio_end_io_list. As a result, freeze_array() may
unblock before these r1bios are released.

This can lead to a situation where conf->raid_disks and the mempool have
already been updated while queued r1bios, allocated with the old
raid_disks value, are later released. Consequently, free_r1bio() may
access memory out of bounds in put_all_bios() and release r1bios of the
wrong size to the new mempool, potentially causing issues with the
mempool as well.

Since only normal I/O might increase nr_queued while an I/O error occurs,
suspending the array avoids this issue.

Note: Updating raid_disks via ioctl SET_ARRAY_INFO already suspends
the array. Therefore, we suspend the array when updating raid_disks
via sysfs to avoid this issue too.

## Affected

- `Linux >= e2d59925221cd562e07fee38ec8839f7209ae603 < 165d1359f945b72c5f90088f60d48ff46115269e`
- `Linux >= e2d59925221cd562e07fee38ec8839f7209ae603 < 0107b18cd8ac17eb3e54786adc05a85cdbb6ef22`
- `Linux >= e2d59925221cd562e07fee38ec8839f7209ae603 < 2cc583653bbe050bacd1cadcc9776d39bf449740`
- `Linux 1b9203bb4c658c0242afa6fdb025c71d2fc3ad76`
- `Linux 8ccf6cfb157419847f3cb2bfdfbcdbd39860e8e9`
- `Linux >= 3.4.59 < 3.5`
- `Linux >= 3.9.7 < 3.10`
- `Linux 3.10`

## Remediation

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