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
- 37-6, 38-1, 38-2, 38-3, 38-3.1, 38-3.1~exp1, 39-1, 39-2, 39-2~bpo13+1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-6862
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 17:49 UTC · Revision 2
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:DEBIAN-CVE-2026-6862
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
efivar
Fixed versions: Not specified
Complete source record
{
"id": "e1e3b6be831f4a9e290d04c2eeec016f4f7ffe3917310c2573c99e4dd27b4e01",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-6862",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-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:DEBIAN-CVE-2026-6862",
"products": [
{
"name": {
"value": "efivar",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "37-6",
"evidence": "/affected/0/versions"
},
{
"value": "38-1",
"evidence": "/affected/0/versions"
},
{
"value": "38-2",
"evidence": "/affected/0/versions"
},
{
"value": "38-3",
"evidence": "/affected/0/versions"
},
{
"value": "38-3.1",
"evidence": "/affected/0/versions"
},
{
"value": "38-3.1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "39-1",
"evidence": "/affected/0/versions"
},
{
"value": "39-2",
"evidence": "/affected/0/versions"
},
{
"value": "39-2~bpo13+1",
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{
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{
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{
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{
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{
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"severity": "medium",
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"aliases": [
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"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
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"package": {
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"purl": "pkg:deb/debian/efivar?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
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"versions": [
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"database_specific": {
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
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},
{
"ranges": [
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"package": {
"name": "efivar",
"purl": "pkg:deb/debian/efivar?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"38-3.1",
"39-1",
"39-2",
"39-2~bpo13+1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-6862.json"
},
"ecosystem_specific": {
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},
{
"ranges": [
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"package": {
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"ecosystem": "Debian:14"
},
"versions": [
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"database_specific": {
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},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-27T09:47:41.246375805Z",
"provider": "osv",
"upstream": [
"CVE-2026-6862"
],
"references": [
"https://security-tracker.debian.org/tracker/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": 461276,
"published_at": "2026-04-22T14:17:08.06+00:00"
}