Upstream information
Description
A local attacker with control over GRUB's configuration can bypass lockdown restrictions when booting with Secure Boot and load an unsigned GRUB module, while GRUB continues to report lockdown is enabled.The vulnerability is caused by insufficient validation of the MMIO base address passed to the GRUB serial command. GRUB does not validate that the base address corresponds to a UART device, rather than being an arbitrary memory address. This allows an attacker to trick GRUB into writing non-arbitrary data at an attacker-controlled address, including resetting the grub_file_verifiers list in a way that disables the subsequent verification of loaded modules.
SUSE information
Overall state of this security issue: Pending
This issue is currently rated as having moderate severity.
| CVSS detail | CNA (Canonical) | SUSE |
|---|---|---|
| Base Score | 6.4 | 6.4 |
| Vector | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H | CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H |
| Attack Vector | Local | Local |
| Attack Complexity | High | High |
| Privileges Required | High | High |
| User Interaction | None | None |
| Scope | Unchanged | Unchanged |
| Confidentiality Impact | High | High |
| Integrity Impact | High | High |
| Availability Impact | High | High |
| CVSSv3 Version | 3.1 | 3.1 |
| CVSS detail | SUSE |
|---|---|
| Base Score | 7.1 |
| Vector | CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N |
| Attack Vector | Local |
| Attack Complexity | Low |
| Attack Requirements | Present |
| Privileges Required | High |
| User Interaction | None |
| Vulnerable System Confidentiality Impact | High |
| Vulnerable System Integrity Impact | High |
| Vulnerable System Availability Impact | High |
| Subsequent System Confidentiality Impact | None |
| Subsequent System Integrity Impact | None |
| Subsequent System Availability Impact | None |
| CVSSv4 Version | 4.0 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SLES15-SP5-CHOST-BYOS-SAP-CCloud | grub2 | Not affected |
| SLES15-SP6-CHOST-BYOS | grub2 | Affected |
| SLES15-SP6-CHOST-BYOS-Aliyun | grub2 | Affected |
| SLES15-SP6-CHOST-BYOS-Azure | grub2 | Affected |
| SLES15-SP6-CHOST-BYOS-EC2 | grub2 | Affected |
| SLES15-SP6-CHOST-BYOS-GCE | grub2 | Affected |
| SLES15-SP6-CHOST-BYOS-GDC | grub2 | Affected |
| SLES15-SP6-CHOST-BYOS-SAP-CCloud | grub2 | Affected |
| SLES15-SP7-CHOST-BYOS-Aliyun | grub2 | Affected |
| SLES15-SP7-CHOST-BYOS-Azure | grub2 | Affected |
| SLES15-SP7-CHOST-BYOS-EC2 | grub2 | Affected |
| SLES15-SP7-CHOST-BYOS-GCE | grub2 | Affected |
| SLES15-SP7-CHOST-BYOS-GDC | grub2 | Affected |
| SLES15-SP7-CHOST-BYOS-SAP-CCloud | grub2 | Affected |
| SUSE Linux Enterprise Desktop 15 SP7 | grub2 | Affected |
| SUSE Linux Enterprise Micro 5.3 | grub2 | Not affected |
| SUSE Linux Enterprise Micro 5.4 | grub2 | Not affected |
| SUSE Linux Enterprise Micro 5.5 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP7 | grub2 | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP7 | grub2 | Affected |
| SUSE Linux Enterprise Server 15 SP7 | grub2 | Affected |
| SUSE Linux Enterprise Server 16.0 | grub2 | Affected |
| SUSE Linux Enterprise Server 16.1 | grub2 | Affected |
| SUSE Linux Enterprise Server 16.2 | grub2 | Affected |
| SUSE Linux Enterprise Server for NVIDIA 16.1 | grub2 | Affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP7 | grub2 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.0 | grub2 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.1 | grub2 | Affected |
| SUSE Linux Enterprise Server for SAP applications 16.2 | grub2 | Affected |
| SUSE Linux Micro 6.0 | grub2 | Affected |
| SUSE Linux Micro 6.1 | grub2 | Affected |
| SUSE Linux Micro 6.2 | grub2 | Affected |
| openSUSE Leap 16.0 | grub2 | Affected |
| openSUSE Leap 16.1 | grub2 | Affected |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SLES15-SP3-CHOST-BYOS-Aliyun | grub2 | Not affected |
| SLES15-SP3-CHOST-BYOS-Azure | grub2 | Not affected |
| SLES15-SP3-CHOST-BYOS-EC2 | grub2 | Not affected |
| SLES15-SP3-CHOST-BYOS-GCE | grub2 | Not affected |
| SLES15-SP3-CHOST-BYOS-SAP-CCloud | grub2 | Not affected |
| SLES15-SP4-CHOST-BYOS | grub2 | Not affected |
| SLES15-SP4-CHOST-BYOS-Aliyun | grub2 | Not affected |
| SLES15-SP4-CHOST-BYOS-Azure | grub2 | Not affected |
| SLES15-SP4-CHOST-BYOS-EC2 | grub2 | Not affected |
| SLES15-SP4-CHOST-BYOS-GCE | grub2 | Not affected |
| SLES15-SP4-CHOST-BYOS-SAP-CCloud | grub2 | Not affected |
| SLES15-SP5-CHOST-BYOS-Aliyun | grub2 | Not affected |
| SLES15-SP5-CHOST-BYOS-Azure | grub2 | Not affected |
| SLES15-SP5-CHOST-BYOS-EC2 | grub2 | Not affected |
| SLES15-SP5-CHOST-BYOS-GCE | grub2 | Not affected |
| SLES15-SP5-CHOST-BYOS-GDC | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 12 SP5 | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | grub2 | Affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP5 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP6 | grub2 | Affected |
| SUSE Linux Enterprise Server 12 SP5 | grub2 | Not affected |
| SUSE Linux Enterprise Server 12 SP5-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP4-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP5 | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP5-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP6 | grub2 | Affected |
| SUSE Linux Enterprise Server 15 SP6-LTSS | grub2 | Affected |
| SUSE Linux Enterprise Server LTSS Extended Security 12 SP5 | grub2 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | grub2 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | grub2 | Affected |
| SUSE Manager Proxy Module 4.3 | grub2 | Not affected |
| SUSE Manager Server Module 4.3 | grub2 | Not affected |
| Products past their end of life and not receiving proactive updates anymore. | ||
| HPE Helion OpenStack 8 | grub2 | Not affected |
| SUSE CaaS Platform 3.0 | grub2 | Not affected |
| SUSE CaaS Platform 4.0 | grub2 | Not affected |
| SUSE Enterprise Storage 6 | grub2 | Not affected |
| SUSE Enterprise Storage 7 | grub2 | Not affected |
| SUSE Enterprise Storage 7.1 | grub2 | Not affected |
| SUSE Linux Enterprise Desktop 12 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise Desktop 12 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP1 | grub2 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP2 | grub2 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP5 | grub2 | Not affected |
| SUSE Linux Enterprise Desktop 15 SP6 | grub2 | Affected |
| SUSE Linux Enterprise High Performance Computing 12 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 12 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | grub2 | Not affected |
| SUSE Linux Enterprise High Performance Computing 15 SP5-ESPOS | grub2 | Not affected |
| SUSE Linux Enterprise Micro 5.0 | grub2 | Not affected |
| SUSE Linux Enterprise Micro 5.2 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP1 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP2 | grub2 | Not affected |
| SUSE Linux Enterprise Module for Server Applications 15 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise Real Time 15 SP2 | grub2 | Not affected |
| SUSE Linux Enterprise Real Time 15 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise Real Time 15 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise Server 12 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise Server 12 SP3-BCL | grub2 | Not affected |
| SUSE Linux Enterprise Server 12 SP3-ESPOS | grub2 | Not affected |
| SUSE Linux Enterprise Server 12 SP3-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise Server 12 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise Server 12 SP4-ESPOS | grub2 | Not affected |
| SUSE Linux Enterprise Server 12 SP4-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP1 | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP1-BCL | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP1-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP2 | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP2-BCL | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP2-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP3-BCL | grub2 | Not affected |
| SUSE Linux Enterprise Server 15 SP3-LTSS | grub2 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | grub2 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | grub2 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | grub2 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | grub2 | Not affected |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | grub2 | Not affected |
| SUSE Manager Proxy 4.0 | grub2 | Not affected |
| SUSE Manager Proxy 4.1 | grub2 | Not affected |
| SUSE Manager Proxy 4.2 | grub2 | Not affected |
| SUSE Manager Proxy 4.3 | grub2 | Not affected |
| SUSE Manager Proxy LTS 4.3 | grub2 | Not affected |
| SUSE Manager Proxy Module 4.2 | grub2 | Not affected |
| SUSE Manager Retail Branch Server 4.0 | grub2 | Not affected |
| SUSE Manager Retail Branch Server 4.1 | grub2 | Not affected |
| SUSE Manager Retail Branch Server 4.2 | grub2 | Not affected |
| SUSE Manager Retail Branch Server 4.3 | grub2 | Not affected |
| SUSE Manager Retail Branch Server LTS 4.3 | grub2 | Not affected |
| SUSE Manager Server 4.0 | grub2 | Not affected |
| SUSE Manager Server 4.1 | grub2 | Not affected |
| SUSE Manager Server 4.2 | grub2 | Not affected |
| SUSE Manager Server 4.3 | grub2 | Not affected |
| SUSE Manager Server LTS 4.3 | grub2 | Not affected |
| SUSE OpenStack Cloud 8 | grub2 | Not affected |
| SUSE OpenStack Cloud 9 | grub2 | Not affected |
| SUSE OpenStack Cloud Crowbar 8 | grub2 | Not affected |
| SUSE OpenStack Cloud Crowbar 9 | grub2 | Not affected |
| openSUSE Leap 15.3 | grub2 | Not affected |
| openSUSE Leap 15.4 | grub2 | Not affected |
| openSUSE Leap 15.5 | grub2 | Not affected |
| openSUSE Leap 15.6 | grub2 | Affected |
| openSUSE Leap Micro 5.2 | grub2 | Not affected |
| openSUSE Leap Micro 5.3 | grub2 | Not affected |
| openSUSE Leap Micro 5.4 | grub2 | Not affected |
| openSUSE Leap Micro 5.5 | grub2 | Not affected |
| Products at an unknown state of their lifecycle. | ||
| SLES-CHOST-BYOS-Aliyun | grub2 | Affected |
| SLES-CHOST-BYOS-Azure | grub2 | Affected |
| SLES-CHOST-BYOS-EC2 | grub2 | Affected |
| SLES-CHOST-BYOS-GCE | grub2 | Affected |
| SLES-CHOST-BYOS-GDC | grub2 | Affected |
| SLES-CHOST-BYOS-SAP-CCloud | grub2 | Affected |
| SUSE-Multi-Linux-Manager-Proxy-BYOS-Azure | grub2 | Affected |
| SUSE-Multi-Linux-Manager-Proxy-BYOS-GCE | grub2 | Affected |
| SUSE-Multi-Linux-Manager-Server-EC2-llc | grub2 | Affected |
| SUSE-Multi-Linux-Manager-Server-EC2-ltd | grub2 | Affected |
| Container Status | ||
| elemental/base-os-kernel-default:16.0 elemental/base-os-kernel-rt:16.0 kiwi-templates-Minimal kiwi-templates-Minimal-Cloud-sap kiwi-templates-Minimal-MS-HyperV-sap kiwi-templates-Minimal-VMware-sap kiwi-templates-Minimal-kvm-and-xen-sap rancher/seedimage-builder suse/hpc/warewulf4-x86_64/sle-hpc-node suse/manager/5.0/x86_64/server suse/multi-linux-manager/5.1/x86_64/server suse/multi-linux-manager/5.2/x86_64/server suse/sl-micro/6.1/base-os-container suse/sles-16.1-kubevirt-minimal suse/sles/16.1/containerdisk-minimal | grub2 | Affected |
| rancher/elemental-builder-image/5.3 rancher/elemental-teal-rt/5.3 rancher/elemental-teal-rt/5.4 rancher/elemental-teal/5.3 rancher/elemental-teal/5.4 suse/sle-micro-rancher/5.2 suse/sle-micro-rancher/5.3 suse/sle-micro-rancher/5.4 suse/sle-micro/base-5.5 | grub2 | Not affected |
SUSE Timeline for this CVE
CVE page created: Mon Oct 5 15:49:22 2026CVE page last modified: Fri Oct 16 12:55:29 2026