# CVE-2026-98833: mtd: core: call _get_device() with the master MTD

> A kernel bug in MTD device handling causes a null pointer dereference when accessing partitions, leading to a local denial of service.

- **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:** 18 Oct 2026
- **Updated:** 21 Oct 2026
- **Also known as:** AZL-108842, BELL-CVE-2026-98833, DEBIAN-CVE-2026-98833, GHSA-p7f7-33cf-6r2w, UBUNTU-CVE-2026-98833

## What is CVE-2026-98833?

CVE-2026-98833 is a vulnerability in Linux, published on 18 Oct 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:

mtd: core: call _get_device() with the master MTD

__get_mtd_device() calls the master's _get_device() callback with mtd,
which may be a partition. __put_mtd_device() passes the master.

This breaks gluebi partitions because gluebi_get_device() uses
container_of() and therefore requires the master MTD. Pass the master
to _get_device(), matching _put_device().

## Which versions are affected by CVE-2026-98833?


## How do I fix CVE-2026-98833?

Apply the vendor's patch.

## Is CVE-2026-98833 being exploited?

There is no known exploitation of CVE-2026-98833 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-98833 and fix it if it is affected.

What it is: CVE-2026-98833 is a vulnerability in Linux, published on 18 Oct 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-2026-98833 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-2026-98833/ (Markdown: https://insights.sbomify.com/CVE-2026-98833/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-98833
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-98833
- OSV: https://osv.dev/vulnerability/CVE-2026-98833

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-98833/
Summaries are generated and may contain mistakes; the official description above is the record.