CVE-2021-3981

Severity: low (CVSS 3.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2022-03-10 · updated 2026-06-17
Weakness: CWE-276

Description

A flaw in grub2 was found where its configuration file, known as grub.cfg, is being created with the wrong permission set allowing non privileged users to read its content. This represents a low severity confidentiality issue, as those users can eventually read any encrypted passwords present in grub.cfg. This flaw affects grub2 2.06 and previous versions. This issue has been fixed in grub upstream but no version with the fix is currently released.

Affected products

Fedoraproject Fedora: 34
grub2: through 2.06

References

http://www.openwall.com/lists/oss-security/2024/01/15/3
https://bugzilla.redhat.com/show_bug.cgi?id=2024170
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AI776L35DDYPCSAAJPJM3ZEQYSFZHBJX/
https://security.gentoo.org/glsa/202209-12
http://www.openwall.com/lists/oss-security/2024/01/15/3
https://bugzilla.redhat.com/show_bug.cgi?id=2024170
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/AI776L35DDYPCSAAJPJM3ZEQYSFZHBJX/
https://security.gentoo.org/glsa/202209-12

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