# CVE-2026-89734: usb: gadget: uvc: Fix null pointer dereference in uvcg_video_init()

> A null pointer dereference in the Linux kernel USB gadget driver can cause a system crash when specific initialization errors occur.

- **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:** 11 Sep 2026
- **Updated:** 19 Oct 2026
- **Also known as:** BELL-CVE-2026-89734, DEBIAN-CVE-2026-89734, GHSA-v583-q5v7-76fp, UBUNTU-CVE-2026-89734

## What is CVE-2026-89734?

CVE-2026-89734 is a vulnerability in Linux, published on 11 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:

usb: gadget: uvc: Fix null pointer dereference in uvcg_video_init()

In uvcg_video_init(), if kthread_run_worker() fails,
the error logged uses uvcg_err(), however, the pointer it uses:
video->uvc is not assigned at this point, triggering a null
pointer dereference. Fix this by directly using uvc->func which
is assigned already.

## Which versions are affected by CVE-2026-89734?


## How do I fix CVE-2026-89734?

Apply the vendor's patch.

## Is CVE-2026-89734 being exploited?

There is no known exploitation of CVE-2026-89734 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-89734 and fix it if it is affected.

What it is: CVE-2026-89734 is a vulnerability in Linux, published on 11 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-2026-89734 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-2026-89734/ (Markdown: https://insights.sbomify.com/CVE-2026-89734/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-89734
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-89734
- OSV: https://osv.dev/vulnerability/CVE-2026-89734

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-89734/
Summaries are generated and may contain mistakes; the official description above is the record.