Home/CVE/The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. Allowing such f
CVE

CVE-2022-28735

The GRUB2's shim_lock verifier allows non-kernel files to be loaded on shim-powered secure boot systems. Allowing such f

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.

MEDIUM · CVSS 6.7 EPSS 0.00019
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
▤

Affected Products & Versions

1
gnu grub2>= 2.00 and < 2.06-3
▣

Scoring & Timeline

6.7
MEDIUM · CVSS v3.1 · security@ubuntu.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD20 Jul 2023 · 01:15 AM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

12
suse-csafopenSUSE-SU-2024:12137-1
usnUSN-6355-1
msrcCVE-2022-28735
suse-csafSUSE-SU-2022:2073-1
suse-csafSUSE-SU-2022:2074-1
🔗

References & Sources

3
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28735Third Party Advisory
https://security.netapp.com/advisory/ntap-20230825-0002/
https://www.openwall.com/lists/oss-security/2022/06/07/5Mailing ListThird Party Advisory
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