# CVE-2021-47489: drm/amdgpu: Fix even more out of bound writes from debugfs

> Out-of-bounds writes in the amdgpu debugfs interface allow attackers to corrupt memory, potentially leading to code execution or privilege escalation.

- **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:** 22 May 2024
- **Updated:** 11 May 2026
- **Also known as:** DEBIAN-CVE-2021-47489, GHSA-843h-74ff-22vf, UBUNTU-CVE-2021-47489

## What is CVE-2021-47489?

CVE-2021-47489 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 22 May 2024. 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/amdgpu: Fix even more out of bound writes from debugfs

CVE-2021-42327 was fixed by:

commit f23750b5b3d98653b31d4469592935ef6364ad67
Author: Thelford Williams <tdwilliamsiv@gmail.com>
Date:   Wed Oct 13 16:04:13 2021 -0400

    drm/amdgpu: fix out of bounds write

but amdgpu_dm_debugfs.c contains more of the same issue so fix the
remaining ones.

v2:
	* Add missing fix in dp_max_bpc_write (Harry Wentland)

Weakness: CWE-787 (Out-of-bounds Write)

## Which versions are affected by CVE-2021-47489?

It affects 2 products.


Products: Debian Debian Linux, Linux kernel.

## How do I fix CVE-2021-47489?

Apply the vendor's patch.

## Is CVE-2021-47489 being exploited?

There is no known exploitation of CVE-2021-47489 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
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- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-47489 and fix it if it is affected.

What it is: CVE-2021-47489 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 22 May 2024. 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-2021-47489 in the wild and no public exploit code.

Affected product: Debian Debian 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-2021-47489/ (Markdown: https://insights.sbomify.com/CVE-2021-47489/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-47489
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-47489
- OSV: https://osv.dev/vulnerability/CVE-2021-47489

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-47489/
Summaries are generated and may contain mistakes; the official description above is the record.