# CVE-2020-27749: grub2-common: The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable...

CVE-2020-27749 is fixed in 30 products on 1 platform, first by RHSA-2021:0696, released March 2, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2020-27749
- Priority: High
- CVSS: 7.5 (Moderate)
- EPSS: 0.0057
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 2, 2021

## Description

The grub2 packages provide version 2 of the Grand Unified Boot Loader (GRUB), a highly configurable and customizable boot loader with modular architecture. The packages support a variety of kernel formats, file systems, computer architectures, and hardware devices.  Security Fix(es):  * grub2: acpi command allows privileged user to load crafted ACPI tables when Secure Boot is enabled (CVE-2020-14372)  * grub2: Use-after-free in rmmod command (CVE-2020-25632)  * grub2: Out-of-bounds write in grub_usb_device_initialize() (CVE-2020-25647)  * grub2: Stack buffer overflow in grub_parser_split_cmdline() (CVE-2020-27749)  * grub2: cutmem command allows privileged user to remove memory regions when Secure Boot is enabled (CVE-2020-27779)  * grub2: Heap out-of-bounds write in short form option parser (CVE-2021-20225)  * grub2: Heap out-of-bounds write due to miscalculation of space required for quoting (CVE-2021-20233)  For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | fwupd RHEL 8 | 0:1.5.9-1.el8_4 | [RHSA-2021:2566](https://patchblox.com/security/data/fix/linux/rhsa-2021-2566.md) | Jun 29, 2021 |
| Linux | grub-efi-amd64 Ubuntu 18.04.6 LTS (bionic) | 2.04-1ubuntu44.1.2 | [grub-efi-amd64 2.04-1ubuntu44.1.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-grub-efi-amd64-2.04-1ubuntu44.1.2.md) | Mar 2, 2021 |
| Linux | grub-efi-amd64 Ubuntu 20.04 LTS (focal) | 2.04-1ubuntu44.2 | [grub-efi-amd64 2.04-1ubuntu44.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-grub-efi-amd64-2.04-1ubuntu44.2.md) | Mar 2, 2021 |
| Linux | grub-efi-amd64-bin Ubuntu 18.04.6 LTS (bionic) | 2.04-1ubuntu44.1.2 | [grub-efi-amd64-bin 2.04-1ubuntu44.1.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-grub-efi-amd64-bin-2.04-1ubuntu44.1.2.md) | Mar 2, 2021 |
| Linux | grub-efi-amd64-bin Ubuntu 20.04 LTS (focal) | 2.04-1ubuntu44.2 | [grub-efi-amd64-bin 2.04-1ubuntu44.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-grub-efi-amd64-bin-2.04-1ubuntu44.2.md) | Mar 2, 2021 |
| Linux | grub-efi-amd64-signed Ubuntu 18.04.6 LTS (bionic) | 1.167~18.04.5+2.04-1ubuntu44.1.2 | [grub-efi-amd64-signed 1.167~18.04.5+2.04-1ubuntu44.1.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-grub-efi-amd64-signed-1.167-18.04.5-2.04-1ubuntu44.1.2.md) | Mar 2, 2021 |
| Linux | grub-efi-amd64-signed Ubuntu 20.04 LTS (focal) | 1.167.2+2.04-1ubuntu44.2 | [grub-efi-amd64-signed 1.167.2+2.04-1ubuntu44.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-grub-efi-amd64-signed-1.167.2-2.04-1ubuntu44.2.md) | Mar 2, 2021 |
| Linux | grub-efi-arm64 Ubuntu 18.04.6 LTS (bionic) | 2.04-1ubuntu44.1.2 | [grub-efi-arm64 2.04-1ubuntu44.1.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-grub-efi-arm64-2.04-1ubuntu44.1.2.md) | Mar 2, 2021 |
| Linux | grub-efi-arm64 Ubuntu 20.04 LTS (focal) | 2.04-1ubuntu44.2 | [grub-efi-arm64 2.04-1ubuntu44.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-grub-efi-arm64-2.04-1ubuntu44.2.md) | Mar 2, 2021 |
| Linux | grub-efi-arm64-bin Ubuntu 18.04.6 LTS (bionic) | 2.04-1ubuntu44.1.2 | [grub-efi-arm64-bin 2.04-1ubuntu44.1.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-grub-efi-arm64-bin-2.04-1ubuntu44.1.2.md) | Mar 2, 2021 |
| Linux | grub-efi-arm64-bin Ubuntu 20.04 LTS (focal) | 2.04-1ubuntu44.2 | [grub-efi-arm64-bin 2.04-1ubuntu44.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-grub-efi-arm64-bin-2.04-1ubuntu44.2.md) | Mar 2, 2021 |
| Linux | grub-efi-arm64-signed Ubuntu 18.04.6 LTS (bionic) | 1.167~18.04.5+2.04-1ubuntu44.1.2 | [grub-efi-arm64-signed 1.167~18.04.5+2.04-1ubuntu44.1.2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-grub-efi-arm64-signed-1.167-18.04.5-2.04-1ubuntu44.1.2.md) | Mar 2, 2021 |
| Linux | grub-efi-arm64-signed Ubuntu 20.04 LTS (focal) | 1.167.2+2.04-1ubuntu44.2 | [grub-efi-arm64-signed 1.167.2+2.04-1ubuntu44.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-grub-efi-arm64-signed-1.167.2-2.04-1ubuntu44.2.md) | Mar 2, 2021 |
| Linux | grub2-common RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-common ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-efi-aa64 RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-efi-aa64 ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-efi-aa64-cdboot RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-efi-aa64-cdboot ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-efi-aa64-modules RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-efi-aa64-modules ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-efi-ia32 RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-efi-ia32 ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-efi-ia32-cdboot RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-efi-ia32-cdboot ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-efi-ia32-modules RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-efi-ia32-modules ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-efi-x64 RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-efi-x64 ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-efi-x64-cdboot RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-efi-x64-cdboot ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-efi-x64-modules RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-efi-x64-modules ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-pc RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-pc ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-pc-modules RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-pc-modules ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-ppc64le RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-ppc64le-modules RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-tools RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-tools ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-tools-efi RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-tools-efi ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-tools-extra RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-tools-extra ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | grub2-tools-minimal RHEL 8 | 1:2.02-90.el8_3.1 | [RHSA-2021:0696](https://patchblox.com/security/data/fix/linux/rhsa-2021-0696.md) | Mar 2, 2021 |
| Linux | grub2-tools-minimal ol 8 | 1:2.02-90.0.2.el8 | [ELSA-2021-9077](https://patchblox.com/security/data/fix/linux/elsa-2021-9077.md) | Mar 2, 2021 |
| Linux | shim-aa64 RHEL 8 | 0:15.4-2.el8_1 | [RHSA-2021:1734](https://patchblox.com/security/data/fix/linux/rhsa-2021-1734.md) | May 18, 2021 |
| Linux | shim-ia32 RHEL 8 | 0:15.4-2.el8_1 | [RHSA-2021:1734](https://patchblox.com/security/data/fix/linux/rhsa-2021-1734.md) | May 18, 2021 |
| Linux | shim-unsigned-aarch64 RHEL 8 | 0:15-7.el8_1 | [RHSA-2021:1734](https://patchblox.com/security/data/fix/linux/rhsa-2021-1734.md) | May 18, 2021 |
| Linux | shim-unsigned-x64 RHEL 8 | 0:15.4-4.el8_1 | [RHSA-2021:1734](https://patchblox.com/security/data/fix/linux/rhsa-2021-1734.md) | May 18, 2021 |
| Linux | shim-x64 RHEL 8 | 0:15.4-2.el8_1 | [RHSA-2021:1734](https://patchblox.com/security/data/fix/linux/rhsa-2021-1734.md) | May 18, 2021 |

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