5.5

CVE-2026-6862: ubuntu libefiboot Uncontrolled Recursion

CVSS: 5.5v3.1MediumModified
AliasesRHSA-2026:69321UBUNTU-CVE-2026-6862DEBIAN-CVE-2026-6862
Published 22-04-2026Last modified 21-09-2026
Open JSON

Vulnerability summary

CVE-2026-6862 is a medium (CVSS 5.5) Uncontrolled Recursion vulnerability in ubuntu libefiboot. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.5% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · +0.06 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 22-04-2026
    PublishedVulnerability first disclosed.
  2. 21-09-2026
    Last modifiedVulnerability information updated.

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 metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

+0.06 pp

From 0.10% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Redhat3 products
  • efivar< 0:39-13.1.hum1
  • efivar-devel< 0:39-13.1.hum1
  • efivar-libs< 0:39-13.1.hum1
Ubuntu2 products
Debian1 product
  • efivarAll versions (No fix recorded)

3 vendors · 6 products

References

10 links