What’s Vulnerable › Vulnerabilities

CVE-2022-3675

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-11-03 · updated 2026-06-17
• Weakness: CWE-20

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.

Affected products

• Fedora Project CoreOS: from 36.20220820.3.0 before 37.20221031.1.0 — fixed in 37.20221031.1.0

How to fix

Upgrade to a fixed version: Fedora Project CoreOS 37.20221031.1.0. Check the vendor advisory for mitigations.

References

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

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