Vulnerability Report

CVE-2026-6862

Title: libefiboot Device Path Node Parser DoS

DoS

Proof Of Concept

No public PoC currently indexed for CVE-2026-6862.

CWE Category CWE-674

Published Date Apr 22, 2026

Modified Date May 13, 2026

Exploit Status Not Found

Score 5.5 CVSS v3.1

Exploit Probability (EPSS)

0.10%

Vulnerability Summary

CVE-2026-6862: 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).

Impacted Vendors

ubuntu 1

Reference Links

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

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.5

Attack Vector

LOCAL

Complexity

LOW

Privileges

N/A

Interaction

REQUIRED

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

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

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-6862 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 13, 2026 MODIFIED

Vulnerability data updated via NVD.

April 22, 2026 MODIFIED

Vulnerability data updated via NVD.

April 22, 2026 MODIFIED

Vulnerability data updated via NVD.

April 22, 2026 MODIFIED

Vulnerability data updated via NVD.

Attack Vector Matrix

Access Vector LOCAL

Complexity LOW

Privileges N/A

Interaction REQUIRED

CVSS Vector String


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

Affected Stack

No specific products linked.