What’s Vulnerable › Vulnerabilities

CVE-2020-25632

• Severity: high (CVSS 8.2 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2021-03-03 · updated 2026-06-17
• Weakness: CWE-416

Description

A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

Affected products

• Fedoraproject Fedora: 33, 34
• grub2: before 2.06 — fixed in 2.06
• NetApp ONTAP Select Deploy administration utility: all versions
• Red Hat Enterprise Linux: 7.0, 8.0
• RedHat Enterprise Linux Server Aus: 7.2, 7.3, 7.4, 7.6, 7.7, 8.2
• RedHat Enterprise Linux Server Eus: 7.6, 7.7, 8.1
• RedHat Enterprise Linux Server Tus: 7.4, 7.6, 7.7, 8.2
• RedHat Enterprise Linux Workstation: 7.0

How to fix

Upgrade to a fixed version: grub2 2.06. Check the vendor advisory for mitigations.

References

• https://bugzilla.redhat.com/show_bug.cgi?id=1879577
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
• https://security.gentoo.org/glsa/202104-05
• https://security.netapp.com/advisory/ntap-20220325-0001/
• https://bugzilla.redhat.com/show_bug.cgi?id=1879577
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZWZ36QK4IKU6MWDWNOOWKPH3WXZBHT2R/
• https://security.gentoo.org/glsa/202104-05
• https://security.netapp.com/advisory/ntap-20220325-0001/

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