Medium
busybox — security advisory
A flaw was found in BusyBox's mount utility. A non-root user can bypass mount security restrictions set in /etc/fstab by specifying clearing-mask options on the command line. These options pass the non-root flag filter and are merged with fstab options as strings; when the combined options are re-parsed, clearing options can override nosuid, nodev, and noexec protections the administrator intended to enforce.
- Products
- busybox
- Affected versions
- 1:1.35.0-4, 1:1.35.0-4+deb12u1, 1:1.36.0-1~exp1, 1:1.36.1-1, 1:1.36.1-2, 1:1.36.1-3, 1:1.36.1-3.1, 1:1.36.1-4, 1:1.36.1-5, 1:1.36.1-6, 1:1.36.1-6~exp.1, 1:1.36.1-7, 1:1.36.1-8, 1:1.36.1-9, 1:1.37.0-1, 1:1.37.0-10, 1:1.37.0-10.1, 1:1.37.0-2, 1:1.37.0-3, 1:1.37.0-4, 1:1.37.0-5, 1:1.37.0-6, 1:1.37.0-7, 1:1.37.0-8, 1:1.37.0-9, 1:1.38.0-1, 1:1.38.0-2, 1:1.38.0-3
- Fixed versions
- Not specified
- CVEs
- CVE-2026-88838
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 19:55 UTC · Revision 1
Source evidence
A flaw was found in BusyBox's mount utility. A non-root user can bypass mount security restrictions set in /etc/fstab by specifying clearing-mask options on the command line. These options pass the non-root flag filter and are merged with fstab options as strings; when the combined options are re-parsed, clearing options can override nosuid, nodev, and noexec protections the administrator intended to enforce.
osv:DEBIAN-CVE-2026-88838
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
busybox
Fixed versions: Not specified
Complete source record
{
"id": "724e99a4923ae862d493cb019e58b4527b3b53eae2d6a9ce71104eaef4eed676",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-88838",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-88838",
"summary": "A flaw was found in BusyBox's mount utility. A non-root user can bypass mount security restrictions set in /etc/fstab by specifying clearing-mask options on the command line. These options pass the non-root flag filter and are merged with fstab options as strings; when the combined options are re-parsed, clearing options can override nosuid, nodev, and noexec protections the administrator intended to enforce.",
"evidence": "osv:DEBIAN-CVE-2026-88838",
"products": [
{
"name": {
"value": "busybox",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.35.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.35.0-4+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.0-1~exp1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-3",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-3.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-4",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-5",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-6",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-6~exp.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-7",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-8",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.36.1-9",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-10",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-10.1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-5",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-6",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-7",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-8",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.37.0-9",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.38.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.38.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "1:1.38.0-3",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "busybox",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.37.0-10",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.37.0-10.1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.37.0-6",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.37.0-7",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.37.0-8",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.37.0-9",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.38.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.38.0-2",
"evidence": "/affected/1/versions"
},
{
"value": "1:1.38.0-3",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "busybox",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "1:1.37.0-10",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.37.0-10.1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.37.0-6",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.37.0-7",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.37.0-8",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.37.0-9",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.38.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.38.0-2",
"evidence": "/affected/2/versions"
},
{
"value": "1:1.38.0-3",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "medium",
"structured": {
"id": "DEBIAN-CVE-2026-88838",
"aliases": [
"DEBIAN-CVE-2026-88838"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "busybox",
"purl": "pkg:deb/debian/busybox?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1:1.35.0-4",
"1:1.35.0-4+deb12u1",
"1:1.36.0-1~exp1",
"1:1.36.1-1",
"1:1.36.1-2",
"1:1.36.1-3",
"1:1.36.1-3.1",
"1:1.36.1-4",
"1:1.36.1-5",
"1:1.36.1-6",
"1:1.36.1-6~exp.1",
"1:1.36.1-7",
"1:1.36.1-8",
"1:1.36.1-9",
"1:1.37.0-1",
"1:1.37.0-10",
"1:1.37.0-10.1",
"1:1.37.0-2",
"1:1.37.0-3",
"1:1.37.0-4",
"1:1.37.0-5",
"1:1.37.0-6",
"1:1.37.0-7",
"1:1.37.0-8",
"1:1.37.0-9",
"1:1.38.0-1",
"1:1.38.0-2",
"1:1.38.0-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88838.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "busybox",
"purl": "pkg:deb/debian/busybox?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1:1.37.0-10",
"1:1.37.0-10.1",
"1:1.37.0-6",
"1:1.37.0-7",
"1:1.37.0-8",
"1:1.37.0-9",
"1:1.38.0-1",
"1:1.38.0-2",
"1:1.38.0-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88838.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "busybox",
"purl": "pkg:deb/debian/busybox?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1:1.37.0-10",
"1:1.37.0-10.1",
"1:1.37.0-6",
"1:1.37.0-7",
"1:1.37.0-8",
"1:1.37.0-9",
"1:1.38.0-1",
"1:1.38.0-2",
"1:1.38.0-3"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-88838.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-16T09:47:25.280866241Z",
"provider": "osv",
"upstream": [
"CVE-2026-88838"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-88838"
]
},
"related_cves": [
{
"value": "CVE-2026-88838",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 338562,
"published_at": "2026-10-13T17:17:48.34+00:00"
}