CVE-2025-61664 Red Hat CVE debrief

Who should care

System administrators managing Linux/Unix systems using GRUB2; security teams responsible for boot chain integrity; organizations with physical security requirements for endpoint devices.

Technical summary

The GRUB2 bootloader's normal module fails to properly unregister the normal_exit command when the module is unloaded. An attacker with local access can trigger this Use-After-Free condition by invoking normal_exit after module removal, causing access to freed memory. This results in denial of service (system crash) and may impact data confidentiality and integrity. The attack requires local access and high complexity due to timing constraints, with no privileges required and no user interaction needed.

Defensive priority

medium

Recommended defensive actions

• Apply GRUB2 updates from distribution vendor when available
• Restrict physical and console access to systems using GRUB2
• Monitor for unexpected system crashes during boot process
• Review secure boot configurations to reduce attack surface

Evidence notes

CVSS 3.1 score 4.9 (Medium) with vector AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L per NVD. CWE-825 (Expired Pointer Dereference) identified. Vendor attribution to Red Hat based on reference domain evidence with low confidence; requires review.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.