A vulnerability has been identified in the GRUB (Grand Unified Bootloader) component. This flaw occurs because the bootloader mishandles string conversion when reading information from a USB device, allowing an attacker to exploit inconsistent length values. A local attacker can connect a maliciously configured USB device during the boot sequence to trigger this issue. A successful exploitation may lead GRUB to crash, leading to a Denial of Service. Data corruption may be also possible, although given the complexity of the exploit the impact is most likely limited.
CVSS Details
- CVSS 3.1 Base Score: 4.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade grub2-tools-efiUpgrade grub2-tools-extraUpgrade grub2-efi-x64-ec2Upgrade grub2-emuUpgrade grub2-efi-aa64-ec2Upgrade grub2-efi-aa64-cdbootUpgrade grub2-emu-modulesUpgrade grub2-efi-aa64Upgrade grub2-efi-aa64-modulesUpgrade grub2-efi-x64-modulesUpgrade grub2-pc-modulesUpgrade grub2-tools-minimalUpgrade grub2-commonUpgrade grub2-toolsUpgrade grub2-debuginfoUpgrade grub2-pcUpgrade grub2-efi-x64-cdbootUpgrade grub2-efi-x64Upgrade grub2 | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade grub2-tools-efiUpgrade grub2-efi-aa64Upgrade grub2-efi-x64Upgrade grub2-debugsourceUpgrade grub2-pc-modulesUpgrade grub2-tools-extraUpgrade grub2-tools-extra-debuginfoUpgrade grub2-tools-efi-debuginfoUpgrade grub2-tools-minimal-debuginfoUpgrade grub2-efi-x64-cdbootUpgrade grub2-emu-debuginfoUpgrade grub2-tools-minimalUpgrade grub2-emuUpgrade grub2-efi-x64-ec2Upgrade grub2-efi-aa64-ec2Upgrade grub2-emu-modulesUpgrade grub2-efi-x64-modulesUpgrade grub2-pcUpgrade grub2-debuginfoUpgrade grub2-tools-debuginfoUpgrade grub2-commonUpgrade grub2-toolsUpgrade grub2-efi-aa64-modulesUpgrade grub2-efi-aa64-cdboot | Jan 12, 2026 | Nov 18, 2025 |
| Huawei Euleros 2_0_sp10 | — | Upgrade grub2-toolsUpgrade grub2-tools-extraUpgrade grub2-commonUpgrade grub2-tools-minimalUpgrade grub2-efi-aa64Upgrade grub2-efi-aa64-modules | Mar 17, 2026 | Mar 16, 2026 |
| Huawei Euleros 2_0_sp12 | — | Upgrade grub2-toolsUpgrade grub2-commonUpgrade grub2-efi-aa64-modulesUpgrade grub2-efi-aa64Upgrade grub2-tools-minimalUpgrade grub2-tools-extra | Mar 17, 2026 | Mar 16, 2026 |
| Huawei Euleros 2_0_sp13 | — | Upgrade grub2-efi-aa64-modulesUpgrade grub2-efi-aa64Upgrade grub2-commonUpgrade grub2-tools-minimalUpgrade grub2-toolsUpgrade grub2-tools-extra | Feb 3, 2026 | Feb 2, 2026 |
| Redhat_linux | — | No solution exists | Jul 17, 2026 | Nov 18, 2025 |
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