# CVE-2026-90404: platform/chrome: cros_ec_debugfs: Unregister panic notifier

> A use-after-free vulnerability in the Linux kernel's Chrome OS EC debugfs driver allows a local attacker to cause a system crash or potentially execute code via a panic notification.

- **Severity:** Not scored
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 17 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** BELL-CVE-2026-90404, DEBIAN-CVE-2026-90404, GHSA-vrhg-47fw-7vch, UBUNTU-CVE-2026-90404

## What is CVE-2026-90404?

CVE-2026-90404 is an use after free vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In the Linux kernel, the following vulnerability has been resolved:

platform/chrome: cros_ec_debugfs: Unregister panic notifier

cros_ec_debugfs_probe() registers notifier_panic with the EC panic
notifier chain. The remove path tears down debugfs and the console log,
but leaves the notifier registered. A later panic notification can call
back into the removed instance and queue work that accesses released
data.

Unregister the panic notifier before tearing down the debugfs and
console log state.

This issue was found by a static analysis tool.

## Which versions are affected by CVE-2026-90404?


## How do I fix CVE-2026-90404?

Apply the vendor's patch.

## Is CVE-2026-90404 being exploited?

There is no known exploitation of CVE-2026-90404 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90404 and fix it if it is affected.

What it is: CVE-2026-90404 is an use after free vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2026-90404 in the wild and no public exploit code.

Affected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-90404/ (Markdown: https://insights.sbomify.com/CVE-2026-90404/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90404
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90404
- OSV: https://osv.dev/vulnerability/CVE-2026-90404

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90404/
Summaries are generated and may contain mistakes; the official description above is the record.