CVE-2026-6862 — MEDIUM (5.5)

Vulnerability 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).

CVSS Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Ubuntu	Libefiboot	-

Related Weaknesses (CWE)

CWE-674

References

https://access.redhat.com/security/cve/CVE-2026-6862Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2459982Issue TrackingThird Party Advisory

FAQ

What is CVE-2026-6862?

CVE-2026-6862 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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 E...

How severe is CVE-2026-6862?

CVE-2026-6862 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-6862?

Check the references section above for vendor advisories and patch information. Affected products include: Ubuntu Libefiboot.