CVE-2026-6862 | Efivar: efivar: denial of service due to stack overflow in device path node parsing

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).

Published: 2026-04-22 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-6862 is rated Low Risk (22.5/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.10%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-6862

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.01% 0.10% +0.09%
2 2026-04-23 — 0.01% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-6862

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.5 3.1 MEDIUM
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:L)
They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 1.8 3.6 [email protected]

Weakness enumeration for CVE-2026-6862

GitHub Security Advisory for CVE-2026-6862

GHSA-364h-vxjm-52rp · Severity: medium — A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot...

OS Trackers for CVE-2026-6862

vendor priority summary link
debian not yet assigned CVE-2026-6862 not yet assigned priority: Debian including 1 source packages (efivar), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5. https://security-tracker.debian.org/tracker/CVE-2026-6862
suse medium — https://www.suse.com/security/cve/CVE-2026-6862/
ubuntu medium CVE-2026-6862 medium priority: Ubuntu including 1 source packages (efivar), 9 status rows across 9 suites (bionic, focal, jammy, noble, questing, resolute, trusty, upstream, xenial): deferred 8, needs-triage 1. https://ubuntu.com/security/CVE-2026-6862

Affected software / configurations for CVE-2026-6862

Vendor Product Version Raw CPE
ubuntu libefiboot — cpe:2.3:a:ubuntu:libefiboot:-:*:*:*:*:*:*:*

References for CVE-2026-6862

URL Tags
https://access.redhat.com/security/cve/CVE-2026-6862 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2459982 Issue Tracking Third Party Advisory
cvelogic Threat Intelligence