High
util-linux — security advisory
The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.
- 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-2026-78408
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 03:19 UTC · Revision 1
Source evidence
The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.
osv:UBUNTU-CVE-2026-78408
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": "54485aa60646df68273d3321080d510d5e1b9ebe0d989233979f79ab0cec2a8b",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-78408",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-78408",
"summary": "The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.",
"evidence": "osv:UBUNTU-CVE-2026-78408",
"products": [
{
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"value": "util-linux",
"evidence": "/affected/0/package/name"
},
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"affected_versions": [
{
"value": "2.20.1-5.1ubuntu9",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "2.20.1-5.1ubuntu11",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
},
{
"value": "2.20.1-5.1ubuntu14",
"evidence": "/affected/0/versions"
},
{
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"evidence": "/affected/0/versions"
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{
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{
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"evidence": "/affected/0/versions"
},
{
"value": "2.20.1-5.1ubuntu18",
"evidence": "/affected/0/versions"
},
{
"value": "2.20.1-5.1ubuntu19",
"evidence": "/affected/0/versions"
},
{
"value": "2.20.1-5.1ubuntu20",
"evidence": "/affected/0/versions"
},
{
"value": "2.20.1-5.1ubuntu20.1",
"evidence": "/affected/0/versions"
},
{
"value": "2.20.1-5.1ubuntu20.2",
"evidence": "/affected/0/versions"
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{
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"evidence": "/affected/0/versions"
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{
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{
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{
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},
{
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}
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{
"name": {
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{
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"evidence": "/affected/1/versions"
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{
"value": "2.27-3ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-1ubuntu2",
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{
"value": "2.27.1-1ubuntu3",
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{
"value": "2.27.1-1ubuntu4",
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{
"value": "2.27.1-3ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-4ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu1",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu2",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3",
"evidence": "/affected/1/versions"
},
{
"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"
},
{
"value": "2.27.1-6ubuntu3.9",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3.10",
"evidence": "/affected/1/versions"
},
{
"value": "2.27.1-6ubuntu3.10+esm2",
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{
"name": {
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"evidence": "/affected/2/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
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"evidence": "/affected/2/versions"
},
{
"value": "2.30.2-0.1ubuntu1",
"evidence": "/affected/2/versions"
},
{
"value": "2.30.2-0.1ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "2.30.2-0.1ubuntu3",
"evidence": "/affected/2/versions"
},
{
"value": "2.31.1-0.4ubuntu2",
"evidence": "/affected/2/versions"
},
{
"value": "2.31.1-0.4ubuntu3",
"evidence": "/affected/2/versions"
},
{
"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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}
]
},
{
"name": {
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},
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{
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{
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{
"value": "2.34-0.1ubuntu5",
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{
"value": "2.34-0.1ubuntu6",
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},
{
"value": "2.34-0.1ubuntu7",
"evidence": "/affected/3/versions"
},
{
"value": "2.34-0.1ubuntu8",
"evidence": "/affected/3/versions"
},
{
"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"
},
{
"value": "2.34-0.1ubuntu9.5",
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{
"value": "2.34-0.1ubuntu9.6",
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},
{
"value": "2.34-0.1ubuntu9.6+esm1",
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},
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{
"value": "2.37.2-4ubuntu1",
"evidence": "/affected/4/versions"
},
{
"value": "2.37.2-4ubuntu2",
"evidence": "/affected/4/versions"
},
{
"value": "2.37.2-4ubuntu3",
"evidence": "/affected/4/versions"
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{
"value": "2.37.2-4ubuntu3.3",
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},
{
"value": "2.37.2-4ubuntu3.4",
"evidence": "/affected/4/versions"
},
{
"value": "2.37.2-4ubuntu3.5",
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{
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},
{
"name": {
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},
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"affected_versions": [
{
"value": "2.39.1-4ubuntu2",
"evidence": "/affected/5/versions"
},
{
"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"
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{
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{
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{
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{
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{
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{
"name": {
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},
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"affected_versions": [
{
"value": "2.41.3-3ubuntu2",
"evidence": "/affected/6/versions"
},
{
"value": "2.42.2-1ubuntu2",
"evidence": "/affected/6/versions"
}
]
},
{
"name": {
"value": "util-linux",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
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"affected_versions": [
{
"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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},
{
"value": "2.41.3-3ubuntu1",
"evidence": "/affected/7/versions"
},
{
"value": "2.41.3-3ubuntu2",
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},
{
"value": "2.41.3-3ubuntu2.2",
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}
]
}
],
"severity": "high",
"structured": {
"id": "UBUNTU-CVE-2026-78408",
"aliases": [
"UBUNTU-CVE-2026-78408"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H"
},
{
"type": "Ubuntu",
"score": "medium"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
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}
]
}
],
"package": {
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"purl": "pkg:deb/ubuntu/util-linux?arch=source&distro=trusty",
"ecosystem": "Ubuntu:14.04:LTS"
},
"versions": [
"2.20.1-5.1ubuntu9",
"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"
],
"database_specific": {
"source": "https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78408.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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{
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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": [
"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",
"2.27.1-6ubuntu3.2",
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"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-2026-78408.json"
},
"ecosystem_specific": {
"binaries": [
{
"binary_name": "bsdutils",
"binary_version": "1:2.27.1-6ubuntu3.10+esm2"
},
{
"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-2026-78408.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"
},
{
"binary_name": "libmount1",
"binary_version": "2.31.1-0.4ubuntu3.7"
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"modified": "2026-10-17T13:01:08.997959260Z",
"provider": "osv",
"upstream": [
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],
"references": [
"https://ubuntu.com/security/CVE-2026-78408",
"https://www.cve.org/CVERecord?id=CVE-2026-78408",
"https://github.com/util-linux/util-linux/security/advisories/GHSA-55fx-f4gg-cfhj",
"https://access.redhat.com/security/cve/CVE-2026-78408",
"https://bugzilla.redhat.com/show_bug.cgi?id=2522497"
]
},
"related_cves": [
{
"value": "CVE-2026-78408",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 361072,
"published_at": "2026-09-02T16:17:00+00:00"
}