CVE-2022-28735

Severity: high (CVSS 7.8 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: 2023-07-20 · updated 2026-06-17

Description

The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. Allowing such files to be loaded may lead to unverified code and modules to be loaded in GRUB2 breaking the secure boot trust-chain.

Affected products

grub2: from 2.00 before 2.06-3 — fixed in 2.06-3

How to fix

Upgrade to a fixed version: grub2 2.06-3. Check the vendor advisory for mitigations.

References

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28735
https://security.netapp.com/advisory/ntap-20230825-0002/
https://www.openwall.com/lists/oss-security/2022/06/07/5
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28735
https://security.netapp.com/advisory/ntap-20230825-0002/
https://www.openwall.com/lists/oss-security/2022/06/07/5

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