Vulnerability in Gnu Grub2
CVE-2022-28735
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.
EPSS: 0.003 (24.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 6.7 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Gnu Grub2
- Gnu Project Grub — versions 0
Public proof-of-concept exploits
References
- security@ubuntu.com (mailing-list, Mailing List, Third Party Advisory)
- security@ubuntu.com (issue-tracking, Third Party Advisory)
- security@ubuntu.com
Frequently asked questions
- What is CVE-2022-28735?
- CVE-2022-28735 is a medium-severity vulnerability in Gnu Grub2. CVSS score: 6.7/10. Published 2023-07-20.
- How severe is CVE-2022-28735?
- Medium severity. CVSS v3 base score is 6.7 out of 10.
- Is CVE-2022-28735 known to be exploited?
- 18 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.