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.
Published · last modified .
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.
EPSS exploit prediction
EPSS: 0.003 (21.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 22nd percentile — 21.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: -0.000
Affected products
- GNU Grub2
- GNU Project Grub — versions 0
Public proof-of-concept exploits
References
- www.openwall.com/lists/oss-security/2022/06/07/5 (mailing-list, Mailing List, Third Party Advisory)
- cve.mitre.org/cgi-bin/cvename.cgi (issue-tracking, Third Party Advisory)
- security.netapp.com/advisory/ntap-20230825-0002/
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.