CVE-2024-45781 Grub2: fs/ufs: oob write in the heap
An out-of-bounds write in GRUB2's UFS filesystem handler allows attackers to bypass Secure Boot and potentially execute arbitrary code.
- 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-2024-45781?
CVE-2024-45781 is a medium-severity memory corruption vulnerability in Red Hat Enterprise Linux 10, published on 18 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. When reading a symbolic link's name from a UFS filesystem, grub2 fails to validate the string length taken as an input. The lack of validation may lead to a heap out-of-bounds write, causing data integrity issues and eventually allowing an attacker to circumvent secure boot protections.
Weakness: CWE-787
Which versions are affected by CVE-2024-45781?
How do I fix CVE-2024-45781?
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-2024-45781 being exploited?
There is no known exploitation of CVE-2024-45781 in the wild and no public exploit code.
Sources
Also known as AZL-56970, AZL-57064, BELL-CVE-2024-45781, DEBIAN-CVE-2024-45781, GHSA-2xfx-cg6v-cwqv, UBUNTU-CVE-2024-45781.