# CVE-2021-38784: Null dereference in n/a

> A NULL pointer dereference in the open_exec syscall allows attackers to crash the system by executing a malicious file on Allwinner R818 Android devices.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Jan 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-q2jh-g2x6-r32c

## What is CVE-2021-38784?

CVE-2021-38784 is a high-severity vulnerability in n/a, published on 18 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

There is a NULL pointer dereference in the syscall open_exec function of Allwinner R818 SoC Android Q SDK V1.0 that could executable a malicious file to cause a system crash.

Weakness: CWE-476 (NULL Pointer Dereference)

## Which versions are affected by CVE-2021-38784?

It affects 1 product.


Products: Allwinnertech Android Q Sdk.

## How do I fix CVE-2021-38784?

No fix has been published for CVE-2021-38784 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-38784 being exploited?

There is no known exploitation of CVE-2021-38784 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2021-38786](https://insights.sbomify.com/CVE-2021-38786/): Null dereference in n/a (high 7.5)
- [CVE-2021-38787](https://insights.sbomify.com/CVE-2021-38787/): Integer overflow in n/a (high 7.5)
- [CVE-2021-38788](https://insights.sbomify.com/CVE-2021-38788/): Denial of service in n/a (high 7.5)
- [CVE-2021-38789](https://insights.sbomify.com/CVE-2021-38789/): Missing authorization in n/a (high 7.5)
- [CVE-2021-38783](https://insights.sbomify.com/CVE-2021-38783/): Memory corruption in n/a (high 7.5)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-38784 and fix it if it is affected.

What it is: CVE-2021-38784 is a high-severity vulnerability in n/a, published on 18 Jan 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2021-38784 in the wild and no public exploit code.

Affected product: n/a. 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-2021-38784/ (Markdown: https://insights.sbomify.com/CVE-2021-38784/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-38784
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-38784
- OSV: https://osv.dev/vulnerability/CVE-2021-38784

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-38784/
Summaries are generated and may contain mistakes; the official description above is the record.