PT-2026-34450 · Efivar · Efivar

Published 2026-04-22 · Updated 2026-04-23 · CVE-2026-6862

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions efivar (affected versions not specified)

Description A flaw exists in the device path node parser of libefiboot, a component of efivar. The parser does not validate that the Length field of each node is at least 4 bytes, which is the minimum size for an EFI (Extensible Firmware Interface) device path node header. A local user can provide a specially crafted device path node to trigger infinite recursion, leading to stack exhaustion and a process crash, which results in a denial of service (DoS).

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

CVE-2026-6862

Affected Products

Efivar

References · 9

• https://security-tracker.debian.org/tracker/CVE-2026-6862 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-6862 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-6862 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-6862 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-6862 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-6862 · Security Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2459982 · Note
• https://twitter.com/CVEnew/status/2047012136979939332 · Twitter Post
• https://access.redhat.com/security/cve/CVE-2026-6862 · Note