# CVE-2021-22386: Use after free in EMUI;Magic UI;HarmonyOS

> Local attackers can exploit a double free vulnerability in Huawei mobile OS components to achieve root privilege escalation.

- **Severity:** High 7.0 (`CVSS:3.1/AV:L/AC:H/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:** No
- **Published:** 10 Aug 2021
- **Updated:** 3 Aug 2024
- **Also known as:** GHSA-4xr8-wp6v-66q2

## What is CVE-2021-22386?

CVE-2021-22386 is a high-severity use after free vulnerability in Huawei Emui, published on 10 Aug 2021. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

A component of the Huawei smartphone has a Double Free vulnerability. Local attackers may exploit this vulnerability to cause Root Elevation of Privileges.

Weakness: CWE-415 (Double Free)

## Which versions are affected by CVE-2021-22386?

It affects 2 products.


Products: Huawei Emui, Huawei Magic Ui.

## How do I fix CVE-2021-22386?

No fix has been published for CVE-2021-22386 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-22386 being exploited?

There is no known exploitation of CVE-2021-22386 in the wild and no public exploit code.

## Other vulnerabilities in Huawei Emui

- [CVE-2023-52370](https://insights.sbomify.com/CVE-2023-52370/): Memory corruption in EMUI (critical 9.8)
- [CVE-2023-52378](https://insights.sbomify.com/CVE-2023-52378/): Business logic in EMUI (critical 9.8)
- [CVE-2023-52381](https://insights.sbomify.com/CVE-2023-52381/): Code injection in EMUI (critical 9.8)
- [CVE-2023-52103](https://insights.sbomify.com/CVE-2023-52103/): Memory corruption in EMUI (critical 9.8)
- [CVE-2023-46773](https://insights.sbomify.com/CVE-2023-46773/): Privilege escalation in EMUI (critical 9.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-22386 and fix it if it is affected.

What it is: CVE-2021-22386 is a high-severity use after free vulnerability in Huawei Emui, published on 10 Aug 2021. 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-2021-22386 in the wild and no public exploit code.

Affected product: Huawei Emui. 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-2021-22386/ (Markdown: https://insights.sbomify.com/CVE-2021-22386/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-22386
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-22386
- OSV: https://osv.dev/vulnerability/CVE-2021-22386

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-22386/
Summaries are generated and may contain mistakes; the official description above is the record.