CVE-2025-0624 Grub2: net: out-of-bounds write in grub_net_search_config_file()
An out-of-bounds write in GRUB2 during network boot allows remote code execution and secure boot bypass via crafted environment variables.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-0624?
CVE-2025-0624 is a high-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 19 Feb 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A flaw was found in grub2. During the network boot process, when trying to search for the configuration file, grub copies data from a user controlled environment variable into an internal buffer using the grub_strcpy() function. During this step, it fails to consider the environment variable length when allocating the internal buffer, resulting in an out-of-bounds write. If correctly exploited, this issue may result in remote code execution through the same network segment grub is searching for the boot information, which can be used to by-pass secure boot protections.
Weakness: CWE-787
Which versions are affected by CVE-2025-0624?
Linux distribution packages (40)
grub2-common AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-efi-aa64 AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-efi-aa64-cdboot AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-efi-aa64-modules AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-efi-ia32 AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-efi-ia32-cdboot AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-efi-ia32-modules AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-efi-x64 AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-efi-x64-cdboot AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-efi-x64-modules AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-pc AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-pc-modules AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-ppc64le AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-ppc64le-modules AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-tools AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-tools-efi AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-tools-extra AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-tools-minimal AlmaLinux:8 | All versions | 1:2.02-162.el8_10.alma.1 |
grub2-common AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-efi-aa64 AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-efi-aa64-cdboot AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-efi-aa64-modules AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-efi-x64 AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-efi-x64-cdboot AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-efi-x64-modules AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-pc AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-pc-modules AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-ppc64le AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-ppc64le-modules AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-tools AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-tools-efi AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-tools-extra AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2-tools-minimal AlmaLinux:9 | All versions | 1:2.06-94.el9_5.alma.1 |
grub2 Red Hat:enterprise_linux:8::baseos | All versions | 1:2.02-162.el8_10 |
grub2-common Red Hat:enterprise_linux:8::baseos | All versions | 1:2.02-162.el8_10 |
grub2-debuginfo Red Hat:enterprise_linux:8::baseos | All versions | 1:2.02-162.el8_10 |
grub2-debugsource Red Hat:enterprise_linux:8::baseos | All versions | 1:2.02-162.el8_10 |
grub2-efi-aa64 Red Hat:enterprise_linux:8::baseos | All versions | 1:2.02-162.el8_10 |
grub2-efi-aa64-cdboot Red Hat:enterprise_linux:8::baseos | All versions | 1:2.02-162.el8_10 |
grub2-efi-aa64-modules Red Hat:enterprise_linux:8::baseos | All versions | 1:2.02-162.el8_10 |
How do I fix CVE-2025-0624?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-0624 being exploited?
There is no known exploitation of CVE-2025-0624 in the wild and no public exploit code.
Sources
Also known as ALSA-2025:2867, ALSA-2025:3367, AZL-56997, AZL-57049, BELL-CVE-2025-0624, CLSA-2025-1756231459 and 15 more.