UBUNTU-CVE-2026-78408

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-78408
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78408.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-78408
Upstream
  • CVE-2026-78408
Published
2026-09-03T00:00:00Z
Modified
2026-09-03T22:56:13.891292557Z
Severity
  • 7.9 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:14.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=trusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.20.1-5.1ubuntu20.9",
            "binary_name": "bsdutils"
        },
        {
            "binary_version": "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"
        },
        {
            "binary_version": "2.20.1-5.1ubuntu20.9",
            "binary_name": "uuid-runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78408.json"
Ubuntu:18.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.31.1-0.4ubuntu3.7",
            "binary_name": "bsdutils"
        },
        {
            "binary_version": "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",
            "binary_name": "libsmartcols1"
        },
        {
            "binary_version": "2.31.1-0.4ubuntu3.7",
            "binary_name": "libuuid1"
        },
        {
            "binary_version": "2.31.1-0.4ubuntu3.7",
            "binary_name": "mount"
        },
        {
            "binary_version": "2.31.1-0.4ubuntu3.7",
            "binary_name": "rfkill"
        },
        {
            "binary_version": "2.31.1-0.4ubuntu3.7",
            "binary_name": "setpriv"
        },
        {
            "binary_version": "2.31.1-0.4ubuntu3.7",
            "binary_name": "util-linux"
        },
        {
            "binary_version": "2.31.1-0.4ubuntu3.7",
            "binary_name": "util-linux-locales"
        },
        {
            "binary_version": "2.31.1-0.4ubuntu3.7",
            "binary_name": "uuid-runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78408.json"
Ubuntu:22.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "bsdextrautils"
        },
        {
            "binary_version": "1:2.37.2-4ubuntu3.6",
            "binary_name": "bsdutils"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "eject"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "fdisk"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "libblkid1"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "libfdisk1"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "libmount1"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "libsmartcols1"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "libuuid1"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "mount"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "rfkill"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "util-linux"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "util-linux-locales"
        },
        {
            "binary_version": "2.37.2-4ubuntu3.6",
            "binary_name": "uuid-runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78408.json"
Ubuntu:24.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "bsdextrautils"
        },
        {
            "binary_version": "1:2.39.3-9ubuntu6.6",
            "binary_name": "bsdutils"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "eject"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "fdisk"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "libblkid1"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "libfdisk1"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "libmount1"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "libsmartcols1"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "libuuid1"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "mount"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "rfkill"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "util-linux"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "util-linux-extra"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "util-linux-locales"
        },
        {
            "binary_version": "2.39.3-9ubuntu6.6",
            "binary_name": "uuid-runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78408.json"
Ubuntu:26.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "bsdextrautils"
        },
        {
            "binary_version": "1:2.41.3-3ubuntu2.2",
            "binary_name": "bsdutils"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "eject"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "fdisk"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "lastlog2"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "libblkid1"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "libfdisk1"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "liblastlog2-2"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "libmount1"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "libpam-lastlog2"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "libsmartcols1"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "libuuid1"
        },
        {
            "binary_version": "1:4.16.0-2+really2.41.3-3ubuntu2.2",
            "binary_name": "login"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "mount"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "rfkill"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "util-linux"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "util-linux-extra"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "util-linux-locales"
        },
        {
            "binary_version": "2.41.3-3ubuntu2.2",
            "binary_name": "uuid-runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78408.json"
Ubuntu:Pro:16.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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
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
2.27.1-6ubuntu3.10
2.27.1-6ubuntu3.10+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.27.1-6ubuntu3.10+esm2",
            "binary_name": "bsdutils"
        },
        {
            "binary_version": "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78408.json"
Ubuntu:Pro:20.04:LTS
util-linux

Package

Name
util-linux
Purl
pkg:deb/ubuntu/util-linux?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
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

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1:2.34-0.1ubuntu9.6+esm1",
            "binary_name": "bsdutils"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "fdisk"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "libblkid1"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "libfdisk1"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "libmount1"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "libsmartcols1"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "libuuid1"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "mount"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "rfkill"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "util-linux"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "util-linux-locales"
        },
        {
            "binary_version": "2.34-0.1ubuntu9.6+esm1",
            "binary_name": "uuid-runtime"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-78408.json"