A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the normal command is not properly unregistered when the module is unloaded. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability. Impact on the data integrity and confidentiality is also not discarded.
CVSS Details
- CVSS 3.1 Base Score: 4.9
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade grub2-commonUpgrade grub2-toolsUpgrade grub2-emuUpgrade grub2-efi-aa64-modulesUpgrade grub2-tools-efiUpgrade grub2-tools-extraUpgrade grub2-emu-modulesUpgrade grub2-efi-x64-ec2Upgrade grub2-efi-aa64Upgrade grub2Upgrade grub2-pc-modulesUpgrade grub2-tools-minimalUpgrade grub2-efi-aa64-ec2Upgrade grub2-efi-x64Upgrade grub2-efi-x64-cdbootUpgrade grub2-efi-aa64-cdbootUpgrade grub2-efi-x64-modulesUpgrade grub2-pcUpgrade grub2-debuginfo | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade grub2-emu-debuginfoUpgrade grub2-efi-aa64-ec2Upgrade grub2-tools-efi-debuginfoUpgrade grub2-efi-x64-modulesUpgrade grub2-tools-extra-debuginfoUpgrade grub2-efi-aa64-modulesUpgrade grub2-pc-modulesUpgrade grub2-debuginfoUpgrade grub2-commonUpgrade grub2-efi-aa64Upgrade grub2-tools-extraUpgrade grub2-efi-x64-ec2Upgrade grub2-emu-modulesUpgrade grub2-tools-minimalUpgrade grub2-tools-efiUpgrade grub2-efi-x64-cdbootUpgrade grub2-pcUpgrade grub2-efi-aa64-cdbootUpgrade grub2-toolsUpgrade grub2-tools-debuginfoUpgrade grub2-emuUpgrade grub2-efi-x64Upgrade grub2-debugsourceUpgrade grub2-tools-minimal-debuginfo | Jan 12, 2026 | Nov 18, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade grub2-efi-aa64-modulesUpgrade grub2-efi-aa64Upgrade grub2-commonUpgrade grub2-toolsUpgrade grub2-tools-extraUpgrade grub2-tools-minimal | Mar 17, 2026 | Mar 17, 2026 |
| Huawei Euleros 2_0_sp11 | — | Upgrade grub2-toolsUpgrade grub2-efi-aa64-modulesUpgrade grub2-efi-aa64Upgrade grub2-tools-minimalUpgrade grub2-commonUpgrade grub2-tools-extra | Mar 17, 2026 | Mar 17, 2026 |
| Huawei Euleros 2_0_sp12 | — | Upgrade grub2-commonUpgrade grub2-tools-extraUpgrade grub2-efi-aa64-modulesUpgrade grub2-tools-minimalUpgrade grub2-toolsUpgrade grub2-efi-aa64 | Mar 17, 2026 | Mar 17, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade grub2-efi-aa64-modulesUpgrade grub2-commonUpgrade grub2-toolsUpgrade grub2-tools-extraUpgrade grub2-tools-minimalUpgrade grub2-efi-aa64 | Feb 3, 2026 | Feb 2, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Nov 18, 2025 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Nov 18, 2025 |
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