ubuntu-cve-2026-6862
Vulnerability from osv_ubuntu
Published
2026-04-22 14:17
Modified
2026-05-20 15:24
Summary
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).
Severity
5.5 (Medium)
N/A (UNKNOWN)
References
| URL | Type | |
|---|---|---|
{
"affected": [
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:14.04:LTS",
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar@0.21-1~14.04.2?arch=source\u0026distro=trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.21-1~14.04.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efivar",
"binary_version": "0.23-2"
},
{
"binary_name": "libefivar0",
"binary_version": "0.23-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar@0.23-2?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.21-1",
"0.23-1",
"0.23-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efivar",
"binary_version": "34-1"
},
{
"binary_name": "libefiboot1",
"binary_version": "34-1"
},
{
"binary_name": "libefivar1",
"binary_version": "34-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar@34-1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"31-1",
"32-1",
"32-2",
"34-1"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar@37-2ubuntu2.2?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"37-2ubuntu2",
"37-2ubuntu2.1",
"37-2ubuntu2.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efivar",
"binary_version": "37-6ubuntu2"
},
{
"binary_name": "libefiboot1",
"binary_version": "37-6ubuntu2"
},
{
"binary_name": "libefivar1",
"binary_version": "37-6ubuntu2"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar@37-6ubuntu2?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"37-6ubuntu2"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar@38-3.1build1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"37-6ubuntu3",
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar@38-3.1build1?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"38-3.1build1"
]
},
{
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar@39-2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"38-3.1build1",
"39-2"
]
}
],
"aliases": [],
"details": "A flaw was found in libefiboot, a component of efivar. The device path node parser in libefiboot fails to validate that each node\u0027s 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).",
"id": "UBUNTU-CVE-2026-6862",
"modified": "2026-05-20T15:24:34Z",
"published": "2026-04-22T14:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-6862"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-6862"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-6862"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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