---
id: CVE-2026-53123
title: 'md: wake raid456 reshape waiters before suspend'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  md: wake raid456 reshape waiters before suspend

  During raid456 reshape, direct IO across the reshape position can sleep
  in raid5_make_request() waiting for reshape pro…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 714d20150ed85811193ae07a494d91f9927c590f <
    8b6a72420821e6da2cab6a69d5233500d2698b93
  - >-
    Linux >= 714d20150ed85811193ae07a494d91f9927c590f <
    ff6b93410192b812d73cc54062529715b2dc849f
  - >-
    Linux >= 714d20150ed85811193ae07a494d91f9927c590f <
    8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0
  - >-
    Linux >= 714d20150ed85811193ae07a494d91f9927c590f <
    cf86bb53b9c92354904a328e947a05ffbfdd1840
  - Linux 2284eab166f2df83f94f0422e15dc9e73b278abf
  - Linux >= 6.6.160 < 6.7
  - Linux 6.7
published: '2026-06-24'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T12:42:09.638Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-53123'
references:
  - url: 'https://git.kernel.org/stable/c/8b6a72420821e6da2cab6a69d5233500d2698b93'
  - url: 'https://git.kernel.org/stable/c/ff6b93410192b812d73cc54062529715b2dc849f'
  - url: 'https://git.kernel.org/stable/c/8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0'
  - url: 'https://git.kernel.org/stable/c/cf86bb53b9c92354904a328e947a05ffbfdd1840'
tags:
  - cve.org
epss: 0.00116
epssPercentile: 0.01537
ingestedAt: '2026-10-21T12:48:53.622Z'
---

## Overview

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

md: wake raid456 reshape waiters before suspend

During raid456 reshape, direct IO across the reshape position can sleep
in raid5_make_request() waiting for reshape progress while still
holding an active_io reference. If userspace then freezes reshape and
writes md/suspend_lo or md/suspend_hi, mddev_suspend() kills active_io
and waits for all in-flight IO to drain.

This can deadlock: the IO needs reshape progress to continue, but the
reshape thread is already frozen, so the active_io reference is never
dropped and suspend never completes.

raid5_prepare_suspend() already wakes wait_for_reshape for dm-raid. Do
the same for normal md suspend when reshape is already interrupted, so
waiting raid456 IO can abort, drop its reference, and let suspend
finish.

The mdadm test tests/25raid456-reshape-deadlock reproduces the hang.

## Affected

- `Linux >= 714d20150ed85811193ae07a494d91f9927c590f < 8b6a72420821e6da2cab6a69d5233500d2698b93`
- `Linux >= 714d20150ed85811193ae07a494d91f9927c590f < ff6b93410192b812d73cc54062529715b2dc849f`
- `Linux >= 714d20150ed85811193ae07a494d91f9927c590f < 8ae3e14d7f3df58f7f49c02d74344e3dcd5f84f0`
- `Linux >= 714d20150ed85811193ae07a494d91f9927c590f < cf86bb53b9c92354904a328e947a05ffbfdd1840`
- `Linux 2284eab166f2df83f94f0422e15dc9e73b278abf`
- `Linux >= 6.6.160 < 6.7`
- `Linux 6.7`

## Remediation

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