CVE-2025-61663
MediumCVSS 4.9Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
A Use-after-Free vulnerability has been found in the GRUB2 bootloader's 'normal' command. The flaw occurs because the command is not properly unregistered when the module is unloaded, allowing an attacker to access invalid memory locations. Successful exploitation leads to system instability and a complete crash.
Risk Assessment
The risk is a Denial of Service (DoS) attack that can halt the system during boot. There is also a potential impact on data integrity and confidentiality.
Recommendation
Immediately update GRUB2 to a patched version. Restrict access to the bootloader console to trusted users only.
Original NVD description (English source)
A vulnerability has been identified in the GRUB2 bootloader's normal command that poses an immediate Denial of Service (DoS) risk. This flaw is a Use-after-Free issue, caused because the normal command is not properly unregistered when the module is unloaded. An attacker who can execute this command can force the system to access memory locations that are no longer valid. Successful exploitation leads directly to system instability, which can result in a complete crash and halt system availability. Impact on the data integrity and confidentiality is also not discarded.