# CVE-2021-39793: Google Pixel Out-of-Bounds Write

> A logic error in the Android kernel's Mali GPU driver allows local attackers to perform an out-of-bounds write, leading to 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:** Yes, since 11 Apr 2022 (CISA KEV)
- **Login needed:** Any signed-in user
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Mar 2022
- **Updated:** 21 Oct 2025
- **Also known as:** A-210470189, GHSA-mx45-vcw4-89j8, PUB-A-210470189

## What is CVE-2021-39793?

CVE-2021-39793 is a high-severity memory corruption vulnerability in Google Android, published on 16 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.

### Official description

In kbase_jd_user_buf_pin_pages of mali_kbase_mem.c, there is a possible out of bounds write due to a logic error in the code. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android kernelAndroid ID: A-210470189References: N/A

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

## Which versions are affected by CVE-2021-39793?

It affects 1 product.


Products: Google Android.

## How do I fix CVE-2021-39793?

Apply the vendor's patch. US federal agencies must fix it by 2 May 2022.

## Is CVE-2021-39793 being exploited?

Yes. Attackers have exploited CVE-2021-39793 in the wild since at least 11 Apr 2022.

## Other vulnerabilities in Google Android

- [CVE-2026-58704](https://insights.sbomify.com/CVE-2026-58704/): Google Pixel Improper Authorization (high 8.8, exploited in the wild)
- [CVE-2025-48543](https://insights.sbomify.com/CVE-2025-48543/): Android Runtime Use-After-Free (high 8.8, exploited in the wild)
- [CVE-2023-35674](https://insights.sbomify.com/CVE-2023-35674/): Android Framework Privilege Escalation (high 8.8, exploited in the wild)
- [CVE-2025-48595](https://insights.sbomify.com/CVE-2025-48595/): Android Framework Integer Overflow (high 8.4, exploited in the wild)
- [CVE-2024-32896](https://insights.sbomify.com/CVE-2024-32896/): Android Pixel Privilege Escalation (high 8.1, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-39793 and fix it if it is affected.

What it is: CVE-2021-39793 is a high-severity memory corruption vulnerability in Google Android, published on 16 Mar 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: Yes. Attackers have exploited CVE-2021-39793 in the wild since at least 11 Apr 2022.

Affected product: Google Android. 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-2021-39793/ (Markdown: https://insights.sbomify.com/CVE-2021-39793/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-39793
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-39793
- OSV: https://osv.dev/vulnerability/CVE-2021-39793

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-39793/
Summaries are generated and may contain mistakes; the official description above is the record.