CVE-2025-22124

Technical 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_p

Remediation

Check the references section for vendor advisories and patches from linux. Update linux_kernel to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected Products

References