# CVE-2025-22124

## Summary

- **CVE ID:** CVE-2025-22124
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Apr 16, 2025
- **Last Modified:** Sep 14, 2026

## Description

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 Products

- Linux — Linux (ab99a87542f194f28e2364a42afbf9fb48b1c724)
- Linux — Linux (655cc01889fa9b65441922565cddee64af49e6d6)
- Linux — Linux (5600d6013c634c2b6b6c6c55c8ecb50c3a6211f2)
- Linux — Linux (6.11)
- Linux — Linux (0)
- Linux — Linux (6.12.46)
- Linux — Linux (6.14.2)
- Linux — Linux (6.15)
- Linux — Linux (6.6.44)
- Linux — Linux (6.10.3)
- Linux — Linux (6.6.157)

## References

- [CNA](https://git.kernel.org/stable/c/60196f92bbc7901eb5cfa5d456651b87ea50a4a3)
- [CNA](https://git.kernel.org/stable/c/bc3a9788961631359527763d7e1fcf26554c7cb1)
- [CNA](https://git.kernel.org/stable/c/6130825f34d41718c98a9b1504a79a23e379701e)
- [CNA](https://git.kernel.org/stable/c/5eaf57fdfa37c869e61e9908e03edd707f9145b8)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.20%
- **EPSS Percentile:** 9.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._