A vulnerability has been identified in the GRUB2 bootloader's network module that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the net_set_vlan command is not properly unregistered when the network module is unloaded from memory. An attacker who can execute this command can force the system to access memory locations that are no longer valid.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
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-efi-aa64-ec2Upgrade grub2-emuUpgrade grub2-efi-aa64-modulesUpgrade grub2-commonUpgrade grub2-pc-modulesUpgrade grub2-tools-efiUpgrade grub2-efi-x64-modulesUpgrade grub2-tools-minimalUpgrade grub2-efi-x64-ec2Upgrade grub2-emu-modulesUpgrade grub2-efi-aa64Upgrade grub2-tools-extraUpgrade grub2-efi-x64Upgrade grub2Upgrade grub2-debuginfoUpgrade grub2-efi-x64-cdbootUpgrade grub2-efi-aa64-cdbootUpgrade grub2-pcUpgrade grub2-tools | May 20, 2026 | May 20, 2026 |
| Amazon_linux_2023 | — | Upgrade grub2-tools-minimal-debuginfoUpgrade grub2-emu-debuginfoUpgrade grub2-tools-efiUpgrade grub2-tools-debuginfoUpgrade grub2-tools-minimalUpgrade grub2-debugsourceUpgrade grub2-toolsUpgrade grub2-efi-x64-modulesUpgrade grub2-tools-extraUpgrade grub2-tools-efi-debuginfoUpgrade grub2-efi-aa64-cdbootUpgrade grub2-emu-modulesUpgrade grub2-efi-x64-ec2Upgrade grub2-efi-aa64Upgrade grub2-emuUpgrade grub2-efi-aa64-modulesUpgrade grub2-debuginfoUpgrade grub2-pcUpgrade grub2-efi-aa64-ec2Upgrade grub2-tools-extra-debuginfoUpgrade grub2-efi-x64Upgrade grub2-commonUpgrade grub2-pc-modulesUpgrade grub2-efi-x64-cdboot | Jan 12, 2026 | Nov 18, 2025 |
| 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. | Jul 22, 2026 | Nov 18, 2025 |
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