CVE-2026-6862 Red Hat CVE debrief

Who should care

Users of libefiboot and systems that utilize this library should be aware of this vulnerability and take necessary actions to mitigate the risk. This includes administrators of Linux-based systems, developers using libefiboot, and security teams responsible for vulnerability management. The vulnerability's impact is primarily on local systems, and remote exploitation is not a concern. However, the potential for local users to exploit this vulnerability means that systems with untrusted or unauthenticated local users are at higher risk. Additionally, organizations using affected versions of libefiboot should prioritize patching or mitigation efforts to prevent potential denial-of-service attacks. Security teams should monitor system logs for potential exploitation attempts and review system configurations to ensure that libefiboot is properly secured. Furthermore, developers using libefiboot should assess their applications' exposure to this vulnerability and implement compensating controls if necessary. Overall, a coordinated effort between system administrators, developers, and security teams is essential to address this vulnerability effectively and minimize potential risks. It is also recommended that users of affected systems stay informed about any updates or patches released by the vendor and apply them as soon as possible to prevent exploitation. By taking proactive measures, organizations can reduce the likelihood of successful attacks and maintain the security and integrity of their systems. The CVE record and NVD entry provide additional details about the vulnerability, and users should consult these resources for further information on affected systems and potential mitigations. In addition, users should verify the authenticity of any patches or updates before applying them to ensure that they are genuine and not malicious. By following these best practices, users can help protect their systems from potential exploitation and minimize the risk of denial-of-service attacks. Finally, users should consider implementing additional security measures, such as monitoring system logs and network traffic, to detect and respond to potential exploitationattempts

Technical summary

The device path node parser in libefiboot fails to validate that each node's Length field is at least 4 bytes, which is the minimum size for an EFI device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node, leading to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS). The affected component, libefiboot, is part of the efivar package.

Defensive priority

Medium-priority defensive actions are required to address this vulnerability.

Recommended defensive actions

• Inventory and assess systems for libefiboot usage.
• Apply vendor patches or updates for libefiboot.
• Monitor system logs for potential exploitation attempts.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Check relevant monitoring, detection, and logs for exposed assets that need extra review.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Evidence notes

The CVE record and NVD entry provide details about the vulnerability in libefiboot. Further analysis is needed to fully understand the impact and affected systems. A local user could potentially exploit this vulnerability by providing a specially crafted device path node, which could lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).

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.