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
02 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
03 Exploitation and scoring
- Exploitation
- Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
- SSVC decision
- ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
- AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
- Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
- EPSS probability
- 0.31% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 24.0% of scored records. A rank, not a probability.
- NVD base score
- 7.8 (CVSS v3.x), scored by the NVD independently of the CNA.
- NVD CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- NVD analysis status
- Modified. NVD last modified this record on 2026-06-17.
- Red Hat severity
- Moderate. Red Hat's rating for its own products, not a CVSS rating.
Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.
04 Metadata
- Published
- 2023-07-20 00:22Z3 YR AGO
- Last updated
- 2025-02-13 16:32Z1 YR AGO
- Reserved
- 2022-04-05
- Assigning CNA
- canonical
- Record state
- PUBLISHED
- Severity
- Medium (CVSS 6.7)
- CNA CVSS vector
- CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Weaknesses
- CWE-829Inclusion of Functionality from Untrusted Control SphereBase
- Data version
- 5.1
- Document digest
- 5a7d317f7f6641568d023d5235a8b9a40aaa58d19f6898a71ffca874c51d59de
05 Affected products
06 References
- www.openwall.comhttps://www.openwall.com/lists/oss-security/2022/06/07/5
- cve.mitre.orghttps://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-28735
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20230825-0002/
07 Fixed in
AlmaLinux 8
- grub2-common Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-aa64 Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-aa64-cdboot Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-aa64-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-ia32 Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-ia32-cdboot Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-ia32-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-x64 Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-x64-cdboot Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-x64-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-pc Fixed in 1:2.02-123.el8_6.8.alma
- grub2-pc-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-ppc64le-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-tools Fixed in 1:2.02-123.el8_6.8.alma
- grub2-tools-efi Fixed in 1:2.02-123.el8_6.8.alma
- grub2-tools-extra Fixed in 1:2.02-123.el8_6.8.alma
- grub2-tools-minimal Fixed in 1:2.02-123.el8_6.8.alma
- shim-aa64 Fixed in 15.6-1.el8.alma
- shim-ia32 Fixed in 15.6-1.el8.alma
- shim-unsigned-x64 Fixed in 15.6-1.el8.alma
- shim-x64 Fixed in 15.6-1.el8.alma
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
AlmaLinux 9
- grub2-common Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-aa64 Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-aa64-cdboot Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-aa64-modules Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-x64 Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-x64-cdboot Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-x64-modules Fixed in 1:2.06-27.el9_0.7.alma
- grub2-pc Fixed in 1:2.06-27.el9_0.7.alma
- grub2-pc-modules Fixed in 1:2.06-27.el9_0.7.alma
- grub2-ppc64le Fixed in 1:2.06-27.el9_0.7.alma
- grub2-ppc64le-modules Fixed in 1:2.06-27.el9_0.7.alma
- grub2-tools Fixed in 1:2.06-27.el9_0.7.alma
- grub2-tools-efi Fixed in 1:2.06-27.el9_0.7.alma
- grub2-tools-extra Fixed in 1:2.06-27.el9_0.7.alma
- grub2-tools-minimal Fixed in 1:2.06-27.el9_0.7.alma
- shim-aa64 Fixed in 15.6-1.el9.alma
- shim-unsigned-x64 Fixed in 15.6-1.el9.alma
- shim-x64 Fixed in 15.6-1.el9.alma
Source: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Arch Linux
- grub No fix yet
Source: Arch Linux Security Tracker, the Arch Linux security team. Reformatted by exploit.cc.
CloudLinux 8
- grub2-common Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-aa64 Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-aa64-cdboot Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-aa64-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-ia32 Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-ia32-cdboot Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-ia32-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-x64 Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-x64-cdboot Fixed in 1:2.02-123.el8_6.8.alma
- grub2-efi-x64-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-pc Fixed in 1:2.02-123.el8_6.8.alma
- grub2-pc-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-ppc64le-modules Fixed in 1:2.02-123.el8_6.8.alma
- grub2-tools Fixed in 1:2.02-123.el8_6.8.alma
- grub2-tools-efi Fixed in 1:2.02-123.el8_6.8.alma
- grub2-tools-extra Fixed in 1:2.02-123.el8_6.8.alma
- grub2-tools-minimal Fixed in 1:2.02-123.el8_6.8.alma
- shim-aa64 Fixed in 15.6-1.el8.alma
- shim-ia32 Fixed in 15.6-1.el8.alma
- shim-unsigned-x64 Fixed in 15.6-1.el8.alma
- shim-x64 Fixed in 15.6-1.el8.alma
Derived from AlmaLinux 8. Partial coverage: only packages taken from AlmaLinux 8 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
CloudLinux 9
- grub2-common Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-aa64 Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-aa64-cdboot Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-aa64-modules Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-x64 Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-x64-cdboot Fixed in 1:2.06-27.el9_0.7.alma
- grub2-efi-x64-modules Fixed in 1:2.06-27.el9_0.7.alma
- grub2-pc Fixed in 1:2.06-27.el9_0.7.alma
- grub2-pc-modules Fixed in 1:2.06-27.el9_0.7.alma
- grub2-ppc64le Fixed in 1:2.06-27.el9_0.7.alma
- grub2-ppc64le-modules Fixed in 1:2.06-27.el9_0.7.alma
- grub2-tools Fixed in 1:2.06-27.el9_0.7.alma
- grub2-tools-efi Fixed in 1:2.06-27.el9_0.7.alma
- grub2-tools-extra Fixed in 1:2.06-27.el9_0.7.alma
- grub2-tools-minimal Fixed in 1:2.06-27.el9_0.7.alma
- shim-aa64 Fixed in 15.6-1.el9.alma
- shim-unsigned-x64 Fixed in 15.6-1.el9.alma
- shim-x64 Fixed in 15.6-1.el9.alma
Derived from AlmaLinux 9. Partial coverage: only packages taken from AlmaLinux 9 are listed.
Source: CloudLinux errata, CloudLinux Inc. Derived from: AlmaLinux, AlmaLinux OS. Copyright (c) 2023 AlmaLinux OS. Licensed under MIT License. Received through OSV.dev. Reformatted by exploit.cc.
Debian 12
- grub2 Fixed in 2.06-3
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 13
- grub2 Fixed in 2.06-3
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Debian 14
- grub2 Fixed in 2.06-3
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- grub2-signed No fix yet
- grub2-unsigned No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 18.04 LTS
- grub2-signed Fixed in 1.187.3~18.04.1
- grub2-unsigned Fixed in 2.06-2ubuntu14.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 20.04 LTS
- grub2-signed Fixed in 1.187.3~20.04.1
- grub2-unsigned Fixed in 2.06-2ubuntu14.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 22.04 LTS
- grub2-signed Fixed in 1.187.3~22.04.1
- grub2-unsigned Fixed in 2.06-2ubuntu14.1
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu Pro 14.04 LTS
- grub2-signed No fix yet
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.