UBUNTU-CVE-2026-6862

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Source
https://ubuntu.com/security/CVE-2026-6862
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-6862
Upstream
  • CVE-2026-6862
Published
2026-04-22T14:17:00Z
Modified
2026-05-26T19:29:36.071107617Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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).

References

Affected packages

Ubuntu:14.04:LTS
efivar

Package

Name
efivar
Purl
pkg:deb/ubuntu/efivar?arch=source&distro=trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.21-1~14.04.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efivar",
            "binary_version": "0.21-1~14.04.2"
        },
        {
            "binary_name": "libefivar0",
            "binary_version": "0.21-1~14.04.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
Ubuntu:16.04:LTS
efivar

Package

Name
efivar
Purl
pkg:deb/ubuntu/efivar?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.21-1
0.23-1
0.23-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efivar",
            "binary_version": "0.23-2"
        },
        {
            "binary_name": "libefivar0",
            "binary_version": "0.23-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
Ubuntu:18.04:LTS
efivar

Package

Name
efivar
Purl
pkg:deb/ubuntu/efivar?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other
31-1
32-1
32-2
34-1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efivar",
            "binary_version": "34-1"
        },
        {
            "binary_name": "libefiboot1",
            "binary_version": "34-1"
        },
        {
            "binary_name": "libefivar1",
            "binary_version": "34-1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
Ubuntu:20.04:LTS
efivar

Package

Name
efivar
Purl
pkg:deb/ubuntu/efivar?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other
37-2ubuntu2
37-2ubuntu2.*
37-2ubuntu2.1
37-2ubuntu2.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efivar",
            "binary_version": "37-2ubuntu2.2"
        },
        {
            "binary_name": "libefiboot1",
            "binary_version": "37-2ubuntu2.2"
        },
        {
            "binary_name": "libefivar1",
            "binary_version": "37-2ubuntu2.2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
Ubuntu:22.04:LTS
efivar

Package

Name
efivar
Purl
pkg:deb/ubuntu/efivar?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other
37-6ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efivar",
            "binary_version": "37-6ubuntu2"
        },
        {
            "binary_name": "libefiboot1",
            "binary_version": "37-6ubuntu2"
        },
        {
            "binary_name": "libefivar1",
            "binary_version": "37-6ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
Ubuntu:24.04:LTS
efivar

Package

Name
efivar
Purl
pkg:deb/ubuntu/efivar?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

Other
37-6ubuntu3
38-3
38-3.*
38-3.1
38-3.1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efivar",
            "binary_version": "38-3.1build1"
        },
        {
            "binary_name": "libefiboot1t64",
            "binary_version": "38-3.1build1"
        },
        {
            "binary_name": "libefisec1t64",
            "binary_version": "38-3.1build1"
        },
        {
            "binary_name": "libefivar1t64",
            "binary_version": "38-3.1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
Ubuntu:25.10
efivar

Package

Name
efivar
Purl
pkg:deb/ubuntu/efivar?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

38-3.*
38-3.1build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efivar",
            "binary_version": "38-3.1build1"
        },
        {
            "binary_name": "libefiboot1t64",
            "binary_version": "38-3.1build1"
        },
        {
            "binary_name": "libefisec1t64",
            "binary_version": "38-3.1build1"
        },
        {
            "binary_name": "libefivar1t64",
            "binary_version": "38-3.1build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
Ubuntu:26.04:LTS
efivar

Package

Name
efivar
Purl
pkg:deb/ubuntu/efivar?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

38-3.*
38-3.1build1
Other
39-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "efivar",
            "binary_version": "39-2"
        },
        {
            "binary_name": "libefiboot1t64",
            "binary_version": "39-2"
        },
        {
            "binary_name": "libefisec1t64",
            "binary_version": "39-2"
        },
        {
            "binary_name": "libefivar1t64",
            "binary_version": "39-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"