--- title: 'USN-6410-1: GRUB2 vulnerabilities | Ubuntu security notices' description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/notices/USN-6410-1 --- 1. [Ubuntu Security Notices](https://ubuntu.com/security/notices) 2. USN-6410-1 --- # USN-6410-1: GRUB2 vulnerabilities Publication date 4 October 2023 Overview Several security issues were fixed in GRUB2. Releases [23.04](https://ubuntu.com/security/notices?release=lunar) [22.04 LTS](https://ubuntu.com/security/notices?release=jammy) [20.04 LTS](https://ubuntu.com/security/notices?release=focal) --- Open side navigation ## Packages * [grub2-signed](https://ubuntu.com/security/cves?package=grub2-signed) - GRand Unified Bootloader * [grub2-unsigned](https://ubuntu.com/security/cves?package=grub2-unsigned) - GRand Unified Bootloader ## Details It was discovered that a specially crafted file system image could cause a heap-based out-of-bounds write. A local attacker could potentially use this to perform arbitrary code execution bypass and bypass secure boot protections. ([CVE-2023-4692](https://ubuntu.com/security/CVE-2023-4692)) It was discovered that a specially crafted file system image could cause an out-of-bounds read. A physically-present attacker could possibly use this to leak sensitive information to the GRUB pager. ([CVE-2023-4693](https://ubuntu.com/security/CVE-2023-4693)) ## Update instructions In general, a standard system update will make all the necessary changes. [Learn more about how to get the fixes.](https://ubuntu.com/security/cves/about#security) The problem can be corrected by updating your system to the following package versions: | Ubuntu Release | Package Version | | --- | --- | | 23.04 lunar | [grub-efi-amd64](https://launchpad.net/ubuntu/+source/grub2-unsigned) –  [2.06-2ubuntu17.2](https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu17.2) | | | | [grub-efi-amd64-bin](https://launchpad.net/ubuntu/+source/grub2-unsigned) –  [2.06-2ubuntu17.2](https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu17.2) | | | | [grub-efi-amd64-signed](https://launchpad.net/ubuntu/+source/grub2-signed) –  [1.193.2+2.06-2ubuntu17.2](https://launchpad.net/ubuntu/+source/grub2-signed/1.193.2) | | | | [grub-efi-arm64](https://launchpad.net/ubuntu/+source/grub2-unsigned) –  [2.06-2ubuntu17.2](https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu17.2) | | | | [grub-efi-arm64-bin](https://launchpad.net/ubuntu/+source/grub2-unsigned) –  [2.06-2ubuntu17.2](https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu17.2) | | | | [grub-efi-arm64-signed](https://launchpad.net/ubuntu/+source/grub2-signed) –  [1.193.2+2.06-2ubuntu17.2](https://launchpad.net/ubuntu/+source/grub2-signed/1.193.2) | | | | 22.04 LTS jammy | [grub-efi-amd64](https://launchpad.net/ubuntu/+source/grub2-unsigned) –  [2.06-2ubuntu14.4](https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu14.4) | | | | [grub-efi-amd64-bin](https://launchpad.net/ubuntu/+source/grub2-unsigned) –  [2.06-2ubuntu14.4](https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu14.4) | | | | [grub-efi-amd64-signed](https://launchpad.net/ubuntu/+source/grub2-signed) –  [1.187.6+2.06-2ubuntu14.4](https://launchpad.net/ubuntu/+source/grub2-signed/1.187.6) | | | | [grub-efi-arm64](https://launchpad.net/ubuntu/+source/grub2-unsigned) –  [2.06-2ubuntu14.4](https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu14.4) | | | | [grub-efi-arm64-bin](https://launchpad.net/ubuntu/+source/grub2-unsigned) –  [2.06-2ubuntu14.4](https://launchpad.net/ubuntu/+source/grub2-unsigned/2.06-2ubuntu14.4) | | | | [grub-efi-arm64-signed](https://launchpad.net/ubuntu/+source/grub2-signed) –  [1.187.6+2.06-2ubuntu14.4](https://launchpad.net/ubuntu/+source/grub2-signed/1.187.6) | | | | 20.04 LTS focal | [grub-efi-amd64-signed](https://launchpad.net/ubuntu/+source/grub2-signed) –  [1.187.6~20.04.1+2.06-2ubuntu14.4](https://launchpad.net/ubuntu/+source/grub2-signed/1.187.6~20.04.1) | | | | [grub-efi-arm64-signed](https://launchpad.net/ubuntu/+source/grub2-signed) –  [1.187.6~20.04.1+2.06-2ubuntu14.4](https://launchpad.net/ubuntu/+source/grub2-signed/1.187.6~20.04.1) | | | --- ### Reduce your security exposure Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines. [Get Ubuntu Pro](https://ubuntu.com/pro) ## References * [CVE-2023-4693](https://ubuntu.com/security/CVE-2023-4693) * [CVE-2023-4692](https://ubuntu.com/security/CVE-2023-4692)