A flaw was found in grub2 in versions prior to 2.06. Variable names present are expanded in the supplied command line into their corresponding variable contents, using a 1kB stack buffer for temporary storage, without sufficient bounds checking. If the function is called with a command line that references a variable with a sufficiently large payload, it is possible to overflow the stack buffer, corrupt the stack frame and control execution which could also circumvent Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
CVSS Details
- CVSS 3.1 Base Score: 6.7
- CVSS 3.1 Vector: (CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade shim-unsigned-aarch64Upgrade shim-x64Upgrade shim-ia32Upgrade shim-aa64Upgrade shim-unsigned-x64 | May 4, 2022 | Mar 3, 2021 |
| Alpine Linux | — | Upgrade grub | Aug 22, 2024 | Mar 3, 2021 |
| Amazon Linux Ami 2 | — | Upgrade grub2-efi-x64-ec2Upgrade grub2-commonUpgrade grub2-pc-modulesUpgrade grub2-efi-aa64-ec2Upgrade grub2Upgrade grub2-tools-minimalUpgrade grub2-pcUpgrade grub2-efi-aa64Upgrade grub2-efi-aa64-modulesUpgrade grub2-tools-efiUpgrade grub2-efi-aa64-cdbootUpgrade grub2-efi-x64Upgrade grub2-efi-x64-modulesUpgrade grub2-efi-x64-cdbootUpgrade grub2-debuginfoUpgrade grub2-emu-modulesUpgrade grub2-emuUpgrade grub2-toolsUpgrade grub2-tools-extra | Jul 19, 2021 | Mar 3, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Mar 3, 2021 |
| Centos_linux | — | Upgrade grub2-pcUpgrade grub2-efi-x64Upgrade fwupd-tests-debuginfoUpgrade grub2-tools-minimalUpgrade fwupd-debuginfoUpgrade grub2-tools-efiUpgrade grub2-efi-x64-cdbootUpgrade grub2-ppc64le-modulesUpgrade grub2-tools-efi-debuginfoUpgrade grub2-debugsourceUpgrade grub2-efi-ia32-modulesUpgrade grub2-toolsUpgrade grub2-efi-ia32Upgrade shim-ia32Upgrade grub2-tools-extraUpgrade grub2-ppc64-modulesUpgrade grub2Upgrade grub2-tools-minimal-debuginfoUpgrade grub2-efi-aa64-modulesUpgrade fwupdUpgrade grub2-efi-ia32-cdbootUpgrade shim-x64Upgrade grub2-efi-x64-modulesUpgrade grub2-pc-modulesUpgrade grub2-debuginfoUpgrade fwupd-debugsourceUpgrade grub2-ppc-modulesUpgrade grub2-tools-extra-debuginfoUpgrade grub2-tools-debuginfoUpgrade grub2-common | Mar 3, 2021 | Mar 2, 2021 |
| Debian | — | Upgrade grub2 | Mar 4, 2021 | Mar 4, 2021 |
| Gentoo Linux | — | Upgrade sys-devel/grub. | May 3, 2021 | Mar 3, 2021 |
| Huawei Euleros 2_0_sp8 | — | Upgrade grub2-tools-minimalUpgrade grub2-efi-aa64-modulesUpgrade grub2-efi-aa64-cdbootUpgrade grub2-efi-aa64Upgrade grub2-commonUpgrade grub2-toolsUpgrade grub2-tools-extra | May 18, 2021 | Mar 3, 2021 |
| Huawei Euleros 2_0_sp9 | — | Upgrade grub2-tools-minimalUpgrade grub2-toolsUpgrade grub2-commonUpgrade grub2-tools-extraUpgrade grub2-efi-aa64-modulesUpgrade grub2-efi-aa64 | Jun 2, 2021 | Mar 3, 2021 |
| Oracle_linux | — | Upgrade grub2Upgrade grub2-pc-modulesUpgrade grub2-efi-x64-cdbootUpgrade grub2-efi-x64Upgrade grub2-commonUpgrade grub2-efi-aa64-modulesUpgrade grub2-efi-aa64Upgrade grub2-efi-ia32Upgrade grub2-pcUpgrade grub2-tools-minimalUpgrade grub2-tools-efiUpgrade grub2-tools-extraUpgrade grub2-efi-ia32-modulesUpgrade grub2-efi-ia32-cdbootUpgrade grub2-toolsUpgrade grub2-efi-x64-modulesUpgrade grub2-efi-aa64-cdboot | Mar 3, 2021 | Mar 2, 2021 |
| Redhat_linux | — | Upgrade grub2-efi-ia32-cdbootUpgrade grub2-ppc64le-modulesUpgrade grub2-efi-aa64-modulesUpgrade grub2-pc-modulesUpgrade grub2-tools-extraUpgrade fwupd-debugsourceUpgrade grub2-tools-efi-debuginfoUpgrade fwupdUpgrade grub2-tools-debuginfoUpgrade grub2-commonUpgrade shim-x64Upgrade grub2-tools-extra-debuginfoUpgrade grub2-efi-x64-modulesUpgrade grub2-debuginfoUpgrade grub2-efi-ia32Upgrade grub2-pcUpgrade shim-ia32Upgrade grub2Upgrade grub2-efi-ia32-modulesUpgrade grub2-debugsourceUpgrade grub2-tools-minimalUpgrade grub2-tools-minimal-debuginfoUpgrade fwupd-tests-debuginfoUpgrade shim-unsigned-x64No solution existsUpgrade grub2-ppc-modulesUpgrade fwupd-debuginfoUpgrade grub2-efi-x64Upgrade grub2-toolsUpgrade grub2-efi-x64-cdbootUpgrade grub2-tools-efiUpgrade grub2-ppc64-modules | Mar 3, 2021 | Mar 2, 2021 |
| Rocky_linux | — | Upgrade fwupd-debugsourceUpgrade fwupdUpgrade fwupd-debuginfo | Mar 12, 2024 | Mar 3, 2021 |
| Suse | — | Upgrade grub2-i386-pcUpgrade grub2-x86_64-efi-debugUpgrade grub2-snapper-pluginUpgrade grub2-i386-xenUpgrade grub2Upgrade grub2-s390x-emuUpgrade grub2-branding-upstreamUpgrade grub2-x86_64-efiUpgrade grub2-arm64-efiUpgrade grub2-x86_64-xenUpgrade grub2-powerpc-ieee1275Upgrade grub2-i386-efiUpgrade grub2-i386-efi-debugUpgrade grub2-systemd-sleep-pluginUpgrade grub2-i386-pc-debug | Mar 3, 2021 | Mar 2, 2021 |
| Ubuntu | — | Upgrade grub-efi-amd64-signedUpgrade grub-efi-arm64-binUpgrade grub-efi-arm64-signedUpgrade grub-efi-amd64-bin | Jun 18, 2021 | Mar 2, 2021 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Jan 20, 2025 | Mar 3, 2021 |
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