A flaw was found in grub2 in versions prior to 2.06. The rmmod implementation allows the unloading of a module used as a dependency without checking if any other dependent module is still loaded leading to a use-after-free scenario. This could allow arbitrary code to be executed or a bypass of Secure Boot protections. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
The product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory “belongs” to the code that operates on the new pointer.
Name | Vendor | Start Version | End Version |
---|---|---|---|
Grub2 | Gnu | * | 2.06 (excluding) |
Red Hat Enterprise Linux 7 | RedHat | grub2-1:2.02-0.87.el7_9.2 | * |
Red Hat Enterprise Linux 7.2 Advanced Update Support | RedHat | grub2-1:2.02-0.86.el7_2.2 | * |
Red Hat Enterprise Linux 7.3 Advanced Update Support | RedHat | grub2-1:2.02-0.86.el7_3.2 | * |
Red Hat Enterprise Linux 7.4 Advanced Update Support | RedHat | grub2-1:2.02-0.86.el7_4.2 | * |
Red Hat Enterprise Linux 7.4 Telco Extended Update Support | RedHat | grub2-1:2.02-0.86.el7_4.2 | * |
Red Hat Enterprise Linux 7.4 Update Services for SAP Solutions | RedHat | grub2-1:2.02-0.86.el7_4.2 | * |
Red Hat Enterprise Linux 7.6 Extended Update Support | RedHat | grub2-1:2.02-0.86.el7_6.3 | * |
Red Hat Enterprise Linux 7.7 Extended Update Support | RedHat | grub2-1:2.02-0.86.el7_7.3 | * |
Red Hat Enterprise Linux 8 | RedHat | grub2-1:2.02-90.el8_3.1 | * |
Red Hat Enterprise Linux 8 | RedHat | shim-0:15.4-2.el8_1 | * |
Red Hat Enterprise Linux 8 | RedHat | shim-unsigned-aarch64-0:15-7.el8_1 | * |
Red Hat Enterprise Linux 8 | RedHat | shim-unsigned-x64-0:15.4-4.el8_1 | * |
Red Hat Enterprise Linux 8 | RedHat | fwupd-0:1.5.9-1.el8_4 | * |
Red Hat Enterprise Linux 8.1 Extended Update Support | RedHat | grub2-1:2.02-87.el8_1.2 | * |
Red Hat Enterprise Linux 8.1 Extended Update Support | RedHat | fwupd-0:1.1.4-4.el8_1 | * |
Red Hat Enterprise Linux 8.1 Extended Update Support | RedHat | shim-0:15.4-2.el8_1 | * |
Red Hat Enterprise Linux 8.1 Extended Update Support | RedHat | shim-unsigned-aarch64-0:15-7.el8_1 | * |
Red Hat Enterprise Linux 8.1 Extended Update Support | RedHat | shim-unsigned-x64-0:15.4-4.el8_1 | * |
Red Hat Enterprise Linux 8.2 Extended Update Support | RedHat | grub2-1:2.02-87.el8_2.3 | * |
Red Hat Enterprise Linux 8.2 Extended Update Support | RedHat | fwupd-0:1.1.4-9.el8_2 | * |
Red Hat Enterprise Linux 8.2 Extended Update Support | RedHat | shim-0:15.4-2.el8_1 | * |
Red Hat Enterprise Linux 8.2 Extended Update Support | RedHat | shim-unsigned-aarch64-0:15-7.el8_1 | * |
Red Hat Enterprise Linux 8.2 Extended Update Support | RedHat | shim-unsigned-x64-0:15.4-4.el8_1 | * |
Grub2 | Ubuntu | bionic | * |
Grub2 | Ubuntu | trusty | * |
Grub2 | Ubuntu | xenial | * |
Grub2-signed | Ubuntu | bionic | * |
Grub2-signed | Ubuntu | esm-infra-legacy/trusty | * |
Grub2-signed | Ubuntu | esm-infra/bionic | * |
Grub2-signed | Ubuntu | esm-infra/focal | * |
Grub2-signed | Ubuntu | esm-infra/xenial | * |
Grub2-signed | Ubuntu | focal | * |
Grub2-signed | Ubuntu | groovy | * |
Grub2-signed | Ubuntu | hirsute | * |
Grub2-signed | Ubuntu | impish | * |
Grub2-signed | Ubuntu | trusty | * |
Grub2-signed | Ubuntu | trusty/esm | * |
Grub2-signed | Ubuntu | xenial | * |
Grub2-unsigned | Ubuntu | bionic | * |
Grub2-unsigned | Ubuntu | esm-infra/bionic | * |
Grub2-unsigned | Ubuntu | esm-infra/focal | * |
Grub2-unsigned | Ubuntu | esm-infra/xenial | * |
Grub2-unsigned | Ubuntu | focal | * |
Grub2-unsigned | Ubuntu | groovy | * |
Grub2-unsigned | Ubuntu | hirsute | * |
Grub2-unsigned | Ubuntu | impish | * |
Grub2-unsigned | Ubuntu | precise/esm | * |
Grub2-unsigned | Ubuntu | trusty | * |
Grub2-unsigned | Ubuntu | xenial | * |