# CVE-2026-90227: nvme/ioctl: check SUBMIT_IO with nvme_cmd_allowed()

> Unprivileged users can bypass write restrictions on NVMe devices due to missing authorization checks in the ioctl handler.

- **Severity:** High 7.8 (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **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:** AZL-101963, BELL-CVE-2026-90227, DEBIAN-CVE-2026-90227, GHSA-g7gf-5v23-7wc5, UBUNTU-CVE-2026-90227

## What is CVE-2026-90227?

CVE-2026-90227 is a high-severity missing authorization 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:

nvme/ioctl: check SUBMIT_IO with nvme_cmd_allowed()

Unlike IO_CMD / IO64_CMD, NVME_IOCTL_SUBMIT_IO never calls
nvme_cmd_allowed(). Unprivileged callers can thus issue I/O on a
partition device or write through a read-only file descriptor.

Pass flags and open_for_write through and reject disallowed commands
with -EACCES.

## Which versions are affected by CVE-2026-90227?


## How do I fix CVE-2026-90227?

Apply the vendor's patch.

## Is CVE-2026-90227 being exploited?

There is no known exploitation of CVE-2026-90227 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-90227 and fix it if it is affected.

What it is: CVE-2026-90227 is a high-severity missing authorization 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-2026-90227 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-2026-90227/ (Markdown: https://insights.sbomify.com/CVE-2026-90227/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-90227
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-90227
- OSV: https://osv.dev/vulnerability/CVE-2026-90227

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-90227/
Summaries are generated and may contain mistakes; the official description above is the record.