Medium
efivar — security advisory
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).
- Products
- efivar
- Affected versions
- 0.21-1, 0.21-1~14.04.2, 0.23-1, 0.23-2, 31-1, 32-1, 32-2, 34-1, 37-2ubuntu2, 37-2ubuntu2.1, 37-2ubuntu2.2, 37-6ubuntu2, 37-6ubuntu3, 38-3, 38-3.1, 38-3.1build1, 39-2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-6862
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:50 UTC · Revision 1
Source evidence
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).
osv:UBUNTU-CVE-2026-6862
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
Complete source record
{
"id": "39abd289012a677febf4f3332e9140af2e4170517a9026f509025137bca8d620",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-6862",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-6862",
"summary": "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).",
"evidence": "osv:UBUNTU-CVE-2026-6862",
"products": [
{
"name": {
"value": "efivar",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.21-1~14.04.2",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "efivar",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "0.21-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.23-1",
"evidence": "/affected/1/versions"
},
{
"value": "0.23-2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "efivar",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "31-1",
"evidence": "/affected/2/versions"
},
{
"value": "32-1",
"evidence": "/affected/2/versions"
},
{
"value": "32-2",
"evidence": "/affected/2/versions"
},
{
"value": "34-1",
"evidence": "/affected/2/versions"
}
]
},
{
"name": {
"value": "efivar",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "37-2ubuntu2",
"evidence": "/affected/3/versions"
},
{
"value": "37-2ubuntu2.1",
"evidence": "/affected/3/versions"
},
{
"value": "37-2ubuntu2.2",
"evidence": "/affected/3/versions"
}
]
},
{
"name": {
"value": "efivar",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "37-6ubuntu2",
"evidence": "/affected/4/versions"
}
]
},
{
"name": {
"value": "efivar",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "37-6ubuntu3",
"evidence": "/affected/5/versions"
},
{
"value": "38-3",
"evidence": "/affected/5/versions"
},
{
"value": "38-3.1",
"evidence": "/affected/5/versions"
},
{
"value": "38-3.1build1",
"evidence": "/affected/5/versions"
}
]
},
{
"name": {
"value": "efivar",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "38-3.1build1",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "efivar",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "39-2",
"evidence": "/affected/7/versions"
}
]
},
{
"name": {
"value": "efivar",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "38-3.1build1",
"evidence": "/affected/8/versions"
},
{
"value": "39-2",
"evidence": "/affected/8/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "UBUNTU-CVE-2026-6862",
"aliases": [
"UBUNTU-CVE-2026-6862"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar?arch=source&distro=trusty",
"ecosystem": "Ubuntu:14.04:LTS"
},
"versions": [
"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"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar?arch=source&distro=xenial",
"ecosystem": "Ubuntu:16.04:LTS"
},
"versions": [
"0.21-1",
"0.23-1",
"0.23-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efivar",
"binary_version": "0.23-2"
},
{
"binary_name": "libefivar0",
"binary_version": "0.23-2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"31-1",
"32-1",
"32-2",
"34-1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efivar",
"binary_version": "34-1"
},
{
"binary_name": "libefiboot1",
"binary_version": "34-1"
},
{
"binary_name": "libefivar1",
"binary_version": "34-1"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar?arch=source&distro=focal",
"ecosystem": "Ubuntu:20.04:LTS"
},
"versions": [
"37-2ubuntu2",
"37-2ubuntu2.1",
"37-2ubuntu2.2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar?arch=source&distro=jammy",
"ecosystem": "Ubuntu:22.04:LTS"
},
"versions": [
"37-6ubuntu2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "efivar",
"binary_version": "37-6ubuntu2"
},
{
"binary_name": "libefiboot1",
"binary_version": "37-6ubuntu2"
},
{
"binary_name": "libefivar1",
"binary_version": "37-6ubuntu2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar?arch=source&distro=noble",
"ecosystem": "Ubuntu:24.04:LTS"
},
"versions": [
"37-6ubuntu3",
"38-3",
"38-3.1",
"38-3.1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar?arch=source&distro=questing",
"ecosystem": "Ubuntu:25.10"
},
"versions": [
"38-3.1build1"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar?arch=source&distro=stonking",
"ecosystem": "Ubuntu:26.10"
},
"versions": [
"39-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
},
"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"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "efivar",
"purl": "pkg:deb/ubuntu/efivar?arch=source&distro=resolute",
"ecosystem": "Ubuntu:26.04:LTS"
},
"versions": [
"38-3.1build1",
"39-2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6862.json"
},
"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"
}
]
}
}
],
"modified": "2026-10-17T12:59:21.200577687Z",
"provider": "osv",
"upstream": [
"CVE-2026-6862"
],
"references": [
"https://ubuntu.com/security/CVE-2026-6862",
"https://www.cve.org/CVERecord?id=CVE-2026-6862"
]
},
"related_cves": [
{
"value": "CVE-2026-6862",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359627,
"published_at": "2026-04-22T14:17:00+00:00"
}