Heap Corruption Vulnerability in GRUB2: Arbitrary Code Execution Risk
Summary
DEBIAN-CVE-2025-0677: A flaw was found in grub2. Affects grub2 versions < 2.12-6. Fixed in 2.12-6. How to fix ↓
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Background
GRUB2 (Grand Unified Bootloader version 2) is a widely used bootloader for Linux systems, responsible for loading the operating system kernel and managing the boot process. It supports various filesystems and is essential for system startup. This vulnerability affects GRUB2 versions prior to 2.12-6, exposing systems to potential exploitation through crafted malicious filesystems.
Vulnerability Detail
A flaw was discovered in the GRUB2 UFS module during symlink lookups. The module inadequately checks the inode's data size, leading to a potential overflow when allocating memory for reading file content. This oversight allows an attacker to craft a malicious filesystem that can corrupt heap data, enabling arbitrary code execution and potentially bypassing secure boot mechanisms.
How To Fix
Minimum fixed version
2.12-6
This is the first release that contains the fix.
sudo apt-get install --only-upgrade grub2Tip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
As a temporary workaround, avoid using filesystems that could be manipulated to exploit this vulnerability until the package is updated. Regularly monitor your system for any unusual behavior that may indicate exploitation attempts.
Conclusion
The GRUB2 vulnerability identified as DEBIAN-CVE-2025-0677 poses significant risks, including arbitrary code execution and potential data corruption. It is crucial for users to update their systems to the patched version to mitigate these risks. Regular monitoring and adherence to security best practices are recommended.
See every vulnerability recorded for grub2 →
FAQ
The vulnerability can lead to arbitrary code execution, allowing attackers to manipulate system processes and potentially bypass security measures.
You can use the Vulert platform to monitor and alert for open-source vulnerabilities in your software. Visit Vulert Scanner to check your application without signup.
The vulnerability affects GRUB2 versions prior to 2.12-6 on Debian 13 and 14 systems.
Yes, exploitation of this vulnerability could lead to data corruption and loss due to heap manipulation.
If immediate updates are not possible, consider implementing strict access controls and monitoring for unusual activity as a temporary measure.
References
Related vulnerabilities
Recent vulnerabilities recorded for grub2.
