# CVE-2026-74422: drm/rockchip: inno-hdmi: Switch to drmm_kzalloc()

> A use-after-free in the Rockchip HDMI driver allows local attackers to cause a system crash or potentially execute code.

- **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:** 15 Aug 2026
- **Updated:** 17 Aug 2026
- **Also known as:** DEBIAN-CVE-2026-74422, GHSA-j9hg-prqv-m4rx, UBUNTU-CVE-2026-74422

## What is CVE-2026-74422?

CVE-2026-74422 is an use after free vulnerability in Linux, published on 15 Aug 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:

drm/rockchip: inno-hdmi: Switch to drmm_kzalloc()

Driver makes use of drmm_encoder_init() to initialize the encoder and
automatically handle the cleanup by registering drm_encoder_cleanup()
with drmm_add_action().

However, the internal structure containing the encoder part gets
allocated with devm_kzalloc(), which happens while component_bind_all()
is being called from Rockchip DRM driver.  The component framework
further ensures it is deallocated as part of releasing all the resources
claimed during bind, which is triggered from component_unbind_all().

When the reference to the DRM device gets eventually dropped via
drm_dev_put() in rockchip_drm_unbind(), drmm_encoder_alloc_release()
attempts to access the now released encoder structure, leading to
use-after-free.

Ensure driver's internal structure is still reachable on encoder cleanup
by switching from a device-managed allocation to a drm-managed one.

## Which versions are affected by CVE-2026-74422?


## How do I fix CVE-2026-74422?

Apply the vendor's patch.

## Is CVE-2026-74422 being exploited?

There is no known exploitation of CVE-2026-74422 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-74422 and fix it if it is affected.

What it is: CVE-2026-74422 is an use after free vulnerability in Linux, published on 15 Aug 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-2026-74422 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-2026-74422/ (Markdown: https://insights.sbomify.com/CVE-2026-74422/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-74422
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-74422
- OSV: https://osv.dev/vulnerability/CVE-2026-74422

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-74422/
Summaries are generated and may contain mistakes; the official description above is the record.