High
util-linux — security advisory
util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.
- Products
- util-linux
- Affected versions
- 2.20.1-5.1ubuntu10, 2.20.1-5.1ubuntu11, 2.20.1-5.1ubuntu12, 2.20.1-5.1ubuntu13, 2.20.1-5.1ubuntu14, 2.20.1-5.1ubuntu15, 2.20.1-5.1ubuntu16, 2.20.1-5.1ubuntu17, 2.20.1-5.1ubuntu18, 2.20.1-5.1ubuntu19, 2.20.1-5.1ubuntu20, 2.20.1-5.1ubuntu20.1, 2.20.1-5.1ubuntu20.2, 2.20.1-5.1ubuntu20.3, 2.20.1-5.1ubuntu20.4, 2.20.1-5.1ubuntu20.6, 2.20.1-5.1ubuntu20.7, 2.20.1-5.1ubuntu20.9, 2.20.1-5.1ubuntu9, 2.26.2-6ubuntu3, 2.27-3ubuntu1, 2.27.1-1ubuntu2, 2.27.1-1ubuntu3, 2.27.1-1ubuntu4, 2.27.1-3ubuntu1, 2.27.1-4ubuntu1, 2.27.1-6ubuntu1, 2.27.1-6ubuntu2, 2.27.1-6ubuntu3, 2.27.1-6ubuntu3.1, 2.27.1-6ubuntu3.10, 2.27.1-6ubuntu3.10+esm2, 2.27.1-6ubuntu3.2, 2.27.1-6ubuntu3.3, 2.27.1-6ubuntu3.4, 2.27.1-6ubuntu3.6, 2.27.1-6ubuntu3.7, 2.27.1-6ubuntu3.8, 2.27.1-6ubuntu3.9, 2.30.1-0ubuntu4, 2.30.2-0.1ubuntu1, 2.30.2-0.1ubuntu2, 2.30.2-0.1ubuntu3, 2.31.1-0.4ubuntu2, 2.31.1-0.4ubuntu3, 2.31.1-0.4ubuntu3.1, 2.31.1-0.4ubuntu3.2, 2.31.1-0.4ubuntu3.3, 2.31.1-0.4ubuntu3.4, 2.31.1-0.4ubuntu3.5, 2.31.1-0.4ubuntu3.6, 2.31.1-0.4ubuntu3.7, 2.34-0.1ubuntu2, 2.34-0.1ubuntu4, 2.34-0.1ubuntu5, 2.34-0.1ubuntu6, 2.34-0.1ubuntu7, 2.34-0.1ubuntu8, 2.34-0.1ubuntu9, 2.34-0.1ubuntu9.1, 2.34-0.1ubuntu9.3, 2.34-0.1ubuntu9.4, 2.34-0.1ubuntu9.5, 2.34-0.1ubuntu9.6, 2.34-0.1ubuntu9.6+esm1, 2.36.1-8ubuntu1, 2.37.2-4ubuntu1, 2.37.2-4ubuntu2, 2.37.2-4ubuntu3, 2.37.2-4ubuntu3.3, 2.37.2-4ubuntu3.4, 2.37.2-4ubuntu3.5, 2.37.2-4ubuntu3.6, 2.39.1-4ubuntu2, 2.39.2-6ubuntu1, 2.39.3-6ubuntu2, 2.39.3-9ubuntu2, 2.39.3-9ubuntu4, 2.39.3-9ubuntu6, 2.39.3-9ubuntu6.1, 2.39.3-9ubuntu6.2, 2.39.3-9ubuntu6.3, 2.39.3-9ubuntu6.4, 2.39.3-9ubuntu6.5, 2.39.3-9ubuntu6.6, 2.41-4ubuntu4, 2.41.2-4ubuntu1, 2.41.2-4ubuntu2, 2.41.2-4ubuntu3, 2.41.3-3ubuntu1, 2.41.3-3ubuntu2, 2.41.3-3ubuntu2.2, 2.42.2-1ubuntu2
- Fixed versions
- Not specified
- CVEs
- CVE-2026-76642
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:18 UTC · Revision 1
Source evidence
util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.
osv:UBUNTU-CVE-2026-76642
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
util-linux
Fixed versions: Not specified
Complete source record
{
"id": "7537a406a2d6d6e2bff86d62f1ff6d11459a707dd72ca91f34504177f884e65a",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-76642",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-76642",
"summary": "util-linux versions through 2.41.5 and 2.42.2 fail to check mount helper exit status before running post-mount hooks, allowing unprivileged users to execute privileged operations on pre-existing filesystems. Attackers can exploit X-mount.idmap or X-mount.owner hooks to clone filesystems with inherited suid bits or modify target inode permissions after a helper fails, achieving privilege escalation.",
"evidence": "osv:UBUNTU-CVE-2026-76642",
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
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{
"value": "2.27-3ubuntu1",
"evidence": "/affected/1/versions"
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{
"value": "2.27.1-1ubuntu2",
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{
"value": "2.27.1-1ubuntu3",
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{
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{
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{
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{
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{
"value": "2.27.1-6ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3",
"evidence": "/affected/1/versions"
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{
"value": "2.27.1-6ubuntu3.1",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3.2",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3.3",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3.4",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3.6",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3.7",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3.8",
"evidence": "/affected/1/versions"
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{
"value": "2.27.1-6ubuntu3.9",
"evidence": "/affected/1/versions"
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{
"value": "2.27.1-6ubuntu3.10",
"evidence": "/affected/1/versions"
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{
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{
"name": {
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},
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{
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{
"value": "2.30.2-0.1ubuntu1",
"evidence": "/affected/2/versions"
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{
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{
"value": "2.30.2-0.1ubuntu3",
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{
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},
{
"value": "2.31.1-0.4ubuntu3",
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},
{
"value": "2.31.1-0.4ubuntu3.1",
"evidence": "/affected/2/versions"
},
{
"value": "2.31.1-0.4ubuntu3.2",
"evidence": "/affected/2/versions"
},
{
"value": "2.31.1-0.4ubuntu3.3",
"evidence": "/affected/2/versions"
},
{
"value": "2.31.1-0.4ubuntu3.4",
"evidence": "/affected/2/versions"
},
{
"value": "2.31.1-0.4ubuntu3.5",
"evidence": "/affected/2/versions"
},
{
"value": "2.31.1-0.4ubuntu3.6",
"evidence": "/affected/2/versions"
},
{
"value": "2.31.1-0.4ubuntu3.7",
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}
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{
"name": {
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},
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{
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{
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{
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{
"value": "2.34-0.1ubuntu6",
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{
"value": "2.34-0.1ubuntu7",
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},
{
"value": "2.34-0.1ubuntu8",
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},
{
"value": "2.34-0.1ubuntu9",
"evidence": "/affected/3/versions"
},
{
"value": "2.34-0.1ubuntu9.1",
"evidence": "/affected/3/versions"
},
{
"value": "2.34-0.1ubuntu9.3",
"evidence": "/affected/3/versions"
},
{
"value": "2.34-0.1ubuntu9.4",
"evidence": "/affected/3/versions"
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{
"value": "2.34-0.1ubuntu9.5",
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{
"value": "2.34-0.1ubuntu9.6",
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{
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},
{
"value": "2.37.2-4ubuntu2",
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},
{
"value": "2.37.2-4ubuntu3",
"evidence": "/affected/4/versions"
},
{
"value": "2.37.2-4ubuntu3.3",
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},
{
"value": "2.37.2-4ubuntu3.4",
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{
"value": "2.37.2-4ubuntu3.5",
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{
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{
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"affected_versions": [
{
"value": "2.39.1-4ubuntu2",
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},
{
"value": "2.39.2-6ubuntu1",
"evidence": "/affected/5/versions"
},
{
"value": "2.39.3-6ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "2.39.3-9ubuntu2",
"evidence": "/affected/5/versions"
},
{
"value": "2.39.3-9ubuntu4",
"evidence": "/affected/5/versions"
},
{
"value": "2.39.3-9ubuntu6",
"evidence": "/affected/5/versions"
},
{
"value": "2.39.3-9ubuntu6.1",
"evidence": "/affected/5/versions"
},
{
"value": "2.39.3-9ubuntu6.2",
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{
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},
{
"value": "2.42.2-1ubuntu2",
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}
]
},
{
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},
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{
"value": "2.41-4ubuntu4",
"evidence": "/affected/7/versions"
},
{
"value": "2.41.2-4ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "2.41.2-4ubuntu2",
"evidence": "/affected/7/versions"
},
{
"value": "2.41.2-4ubuntu3",
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},
{
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},
{
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{
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}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-76642",
"aliases": [
"UBUNTU-CVE-2026-76642"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
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"ecosystem": "Ubuntu:14.04:LTS"
},
"versions": [
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"2.20.1-5.1ubuntu10",
"2.20.1-5.1ubuntu11",
"2.20.1-5.1ubuntu12",
"2.20.1-5.1ubuntu13",
"2.20.1-5.1ubuntu14",
"2.20.1-5.1ubuntu15",
"2.20.1-5.1ubuntu16",
"2.20.1-5.1ubuntu17",
"2.20.1-5.1ubuntu18",
"2.20.1-5.1ubuntu19",
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"2.20.1-5.1ubuntu20.6",
"2.20.1-5.1ubuntu20.7",
"2.20.1-5.1ubuntu20.9"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "bsdutils",
"binary_version": "1:2.20.1-5.1ubuntu20.9"
},
{
"binary_name": "libblkid1",
"binary_version": "2.20.1-5.1ubuntu20.9"
},
{
"binary_name": "libmount1",
"binary_version": "2.20.1-5.1ubuntu20.9"
},
{
"binary_name": "libuuid1",
"binary_version": "2.20.1-5.1ubuntu20.9"
},
{
"binary_name": "mount",
"binary_version": "2.20.1-5.1ubuntu20.9"
},
{
"binary_name": "util-linux",
"binary_version": "2.20.1-5.1ubuntu20.9"
},
{
"binary_name": "util-linux-locales",
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},
{
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}
]
}
},
{
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}
]
}
],
"package": {
"name": "util-linux",
"purl": "pkg:deb/ubuntu/util-linux?arch=source&distro=esm-infra%2Fxenial",
"ecosystem": "Ubuntu:Pro:16.04:LTS"
},
"versions": [
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"2.27-3ubuntu1",
"2.27.1-1ubuntu2",
"2.27.1-1ubuntu3",
"2.27.1-1ubuntu4",
"2.27.1-3ubuntu1",
"2.27.1-4ubuntu1",
"2.27.1-6ubuntu1",
"2.27.1-6ubuntu2",
"2.27.1-6ubuntu3",
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"2.27.1-6ubuntu3.4",
"2.27.1-6ubuntu3.6",
"2.27.1-6ubuntu3.7",
"2.27.1-6ubuntu3.8",
"2.27.1-6ubuntu3.9",
"2.27.1-6ubuntu3.10",
"2.27.1-6ubuntu3.10+esm2"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "bsdutils",
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},
{
"binary_name": "libblkid1",
"binary_version": "2.27.1-6ubuntu3.10+esm2"
},
{
"binary_name": "libfdisk1",
"binary_version": "2.27.1-6ubuntu3.10+esm2"
},
{
"binary_name": "libmount1",
"binary_version": "2.27.1-6ubuntu3.10+esm2"
},
{
"binary_name": "libsmartcols1",
"binary_version": "2.27.1-6ubuntu3.10+esm2"
},
{
"binary_name": "libuuid1",
"binary_version": "2.27.1-6ubuntu3.10+esm2"
},
{
"binary_name": "mount",
"binary_version": "2.27.1-6ubuntu3.10+esm2"
},
{
"binary_name": "util-linux",
"binary_version": "2.27.1-6ubuntu3.10+esm2"
},
{
"binary_name": "util-linux-locales",
"binary_version": "2.27.1-6ubuntu3.10+esm2"
},
{
"binary_name": "uuid-runtime",
"binary_version": "2.27.1-6ubuntu3.10+esm2"
}
]
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "util-linux",
"purl": "pkg:deb/ubuntu/util-linux?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
"versions": [
"2.30.1-0ubuntu4",
"2.30.2-0.1ubuntu1",
"2.30.2-0.1ubuntu2",
"2.30.2-0.1ubuntu3",
"2.31.1-0.4ubuntu2",
"2.31.1-0.4ubuntu3",
"2.31.1-0.4ubuntu3.1",
"2.31.1-0.4ubuntu3.2",
"2.31.1-0.4ubuntu3.3",
"2.31.1-0.4ubuntu3.4",
"2.31.1-0.4ubuntu3.5",
"2.31.1-0.4ubuntu3.6",
"2.31.1-0.4ubuntu3.7"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-76642.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "bsdutils",
"binary_version": "1:2.31.1-0.4ubuntu3.7"
},
{
"binary_name": "fdisk",
"binary_version": "2.31.1-0.4ubuntu3.7"
},
{
"binary_name": "libblkid1",
"binary_version": "2.31.1-0.4ubuntu3.7"
},
{
"binary_name": "libfdisk1",
"binary_version": "2.31.1-0.4ubuntu3.7"
},
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"modified": "2026-10-17T13:01:06.989481650Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-76642",
"https://www.cve.org/CVERecord?id=CVE-2026-76642",
"https://github.com/util-linux/util-linux/security/advisories/GHSA-m25x-3hj9-m26f"
]
},
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"value": "CVE-2026-76642",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/1/score"
},
"source_id": "core-osv",
"document_id": 361008,
"published_at": "2026-09-03T13:06:00+00:00"
}