CVE-2026-6862

Medium

Description

A flaw was found in libefiboot, a component of efivar. 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 (Extensible Firmware Interface) device path node header. A local user could exploit this vulnerability by providing a specially crafted device path node. This can lead to infinite recursion, causing stack exhaustion and a process crash, resulting in a denial of service (DoS).

SeverityMedium

CVSS5.5

Exploit probability—

Product

Ubuntu Libefiboot

PublishedApr 22, 2026

First seenApr 22, 2026

Weakness typeCWE-674CWE-674

How to fix

Vendor advisories

access.redhat.com/errata/RHSA-2026:69321

Affected products

Product	Affected versions	Fixed in
ubuntu libefiboot	No range specified	—

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