---
id: CVE-2025-22124
title: 'md/md-bitmap: fix wrong bitmap_limit for clustermd when write sb'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  md/md-bitmap: fix wrong bitmap_limit for clustermd when write sb

  In clustermd, separate write-intent-bitmaps are used for each cluster
  node:

  0                    4k  …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 655cc01889fa9b65441922565cddee64af49e6d6 <
    5eaf57fdfa37c869e61e9908e03edd707f9145b8
  - >-
    Linux >= ab99a87542f194f28e2364a42afbf9fb48b1c724 <
    60196f92bbc7901eb5cfa5d456651b87ea50a4a3
  - >-
    Linux >= ab99a87542f194f28e2364a42afbf9fb48b1c724 <
    bc3a9788961631359527763d7e1fcf26554c7cb1
  - >-
    Linux >= ab99a87542f194f28e2364a42afbf9fb48b1c724 <
    6130825f34d41718c98a9b1504a79a23e379701e
  - Linux 5600d6013c634c2b6b6c6c55c8ecb50c3a6211f2
  - Linux >= 6.6.44 < 6.6.157
  - Linux >= 6.10.3 < 6.11
  - Linux 6.11
published: '2025-04-16'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T11:57:56.837Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-22124'
references:
  - url: 'https://git.kernel.org/stable/c/5eaf57fdfa37c869e61e9908e03edd707f9145b8'
  - url: 'https://git.kernel.org/stable/c/60196f92bbc7901eb5cfa5d456651b87ea50a4a3'
  - url: 'https://git.kernel.org/stable/c/bc3a9788961631359527763d7e1fcf26554c7cb1'
  - url: 'https://git.kernel.org/stable/c/6130825f34d41718c98a9b1504a79a23e379701e'
tags:
  - cve.org
epss: 0.00198
epssPercentile: 0.09925
ingestedAt: '2026-09-14T15:23:07.459Z'
---

## Overview

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

md/md-bitmap: fix wrong bitmap_limit for clustermd when write sb

In clustermd, separate write-intent-bitmaps are used for each cluster
node:

0                    4k                     8k                    12k
-------------------------------------------------------------------
| idle                | md super            | bm super [0] + bits |
| bm bits[0, contd]   | bm super[1] + bits  | bm bits[1, contd]   |
| bm super[2] + bits  | bm bits [2, contd]  | bm super[3] + bits  |
| bm bits [3, contd]  |                     |                     |

So in node 1, pg_index in __write_sb_page() could equal to
bitmap->storage.file_pages. Then bitmap_limit will be calculated to
0. md_super_write() will be called with 0 size.
That means the first 4k sb area of node 1 will never be updated
through filemap_write_page().
This bug causes hang of mdadm/clustermd_tests/01r1_Grow_resize.

Here use (pg_index % bitmap->storage.file_pages) to make calculation
of bitmap_limit correct.

## Affected

- `Linux >= 655cc01889fa9b65441922565cddee64af49e6d6 < 5eaf57fdfa37c869e61e9908e03edd707f9145b8`
- `Linux >= ab99a87542f194f28e2364a42afbf9fb48b1c724 < 60196f92bbc7901eb5cfa5d456651b87ea50a4a3`
- `Linux >= ab99a87542f194f28e2364a42afbf9fb48b1c724 < bc3a9788961631359527763d7e1fcf26554c7cb1`
- `Linux >= ab99a87542f194f28e2364a42afbf9fb48b1c724 < 6130825f34d41718c98a9b1504a79a23e379701e`
- `Linux 5600d6013c634c2b6b6c6c55c8ecb50c3a6211f2`
- `Linux >= 6.6.44 < 6.6.157`
- `Linux >= 6.10.3 < 6.11`
- `Linux 6.11`

## Remediation

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