UBUNTU-CVE-2026-23953

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Source
https://ubuntu.com/security/CVE-2026-23953
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23953.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-23953
Upstream
Published
2026-01-22T22:16:00Z
Modified
2026-01-30T20:32:30.667646Z
Severity
  • 8.7 (High) CVSS_V3 - CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Incus is a system container and virtual machine manager. In versions 6.20.0 and below, a user with the ability to launch a container with a custom YAML configuration (e.g a member of the ‘incus’ group) can create an environment variable containing newlines, which can be used to add additional configuration items in the container’s lxc.conf due to newline injection. This can allow adding arbitrary lifecycle hooks, ultimately resulting in arbitrary command execution on the host. Exploiting this issue on IncusOS requires a slight modification of the payload to change to a different writable directory for the validation step (e.g /tmp). This can be confirmed with a second container with /tmp mounted from the host (A privileged action for validation only). A fix is planned for versions 6.0.6 and 6.21.0, but they have not been released at the time of publication.

References

Affected packages

Ubuntu:Pro:16.04:LTS / lxd

Package

Name
lxd
Purl
pkg:deb/ubuntu/lxd@2.0.11-0ubuntu1~16.04.4+esm1?arch=source&distro=esm-infra/xenial

Affected ranges

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

Affected versions

0.*
0.20-0ubuntu4
0.21-0ubuntu3
0.21-0ubuntu5
0.22-0ubuntu1
0.22-0ubuntu2
0.23-0ubuntu1
0.23-0ubuntu2
0.23-0ubuntu3
0.24-0ubuntu2
0.24-0ubuntu3
0.24-0ubuntu4
0.25-0ubuntu1
0.26-0ubuntu2
0.26-0ubuntu3
0.27-0ubuntu1
0.27-0ubuntu2
2.*
2.0.0~beta1-0ubuntu3
2.0.0~beta1-0ubuntu4
2.0.0~beta2-0ubuntu1
2.0.0~beta2-0ubuntu2
2.0.0~beta3-0ubuntu1
2.0.0~beta3-0ubuntu2
2.0.0~beta3-0ubuntu3
2.0.0~beta3-0ubuntu4
2.0.0~beta4-0ubuntu1
2.0.0~beta4-0ubuntu2
2.0.0~beta4-0ubuntu3
2.0.0~beta4-0ubuntu4
2.0.0~beta4-0ubuntu5
2.0.0~beta4-0ubuntu6
2.0.0~beta4-0ubuntu7
2.0.0~rc1-0ubuntu1
2.0.0~rc1-0ubuntu2
2.0.0~rc1-0ubuntu3
2.0.0~rc2-0ubuntu2
2.0.0~rc2-0ubuntu3
2.0.0~rc3-0ubuntu1
2.0.0~rc3-0ubuntu2
2.0.0~rc3-0ubuntu3
2.0.0~rc3-0ubuntu4
2.0.0~rc4-0ubuntu1
2.0.0~rc5-0ubuntu1
2.0.0~rc6-0ubuntu1
2.0.0~rc6-0ubuntu2
2.0.0~rc7-0ubuntu1
2.0.0~rc7-0ubuntu2
2.0.0~rc8-0ubuntu1
2.0.0~rc8-0ubuntu2
2.0.0~rc8-0ubuntu3
2.0.0~rc8-0ubuntu5
2.0.0~rc8-0ubuntu6
2.0.0~rc8-0ubuntu7
2.0.0~rc9-0ubuntu2
2.0.0~rc9-0ubuntu3
2.0.0~rc9-0ubuntu4
2.0.0~rc9-0ubuntu5
2.0.0-0ubuntu1
2.0.0-0ubuntu2
2.0.0-0ubuntu3
2.0.0-0ubuntu4
2.0.1-0ubuntu1~16.04.1
2.0.2-0ubuntu1~16.04.1
2.0.3-0ubuntu1~ubuntu16.04.2
2.0.4-0ubuntu1~ubuntu16.04.1
2.0.5-0ubuntu1~ubuntu16.04.1
2.0.8-0ubuntu1~ubuntu16.04.1
2.0.8-0ubuntu1~ubuntu16.04.2
2.0.9-0ubuntu1~16.04.1
2.0.9-0ubuntu1~16.04.2
2.0.10-0ubuntu1~16.04.1
2.0.10-0ubuntu1~16.04.2
2.0.11-0ubuntu1~16.04.2
2.0.11-0ubuntu1~16.04.4
2.0.11-0ubuntu1~16.04.4+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-github-lxc-lxd-dev",
            "binary_version": "2.0.11-0ubuntu1~16.04.4+esm1"
        },
        {
            "binary_name": "lxc2",
            "binary_version": "2.0.11-0ubuntu1~16.04.4+esm1"
        },
        {
            "binary_name": "lxd",
            "binary_version": "2.0.11-0ubuntu1~16.04.4+esm1"
        },
        {
            "binary_name": "lxd-client",
            "binary_version": "2.0.11-0ubuntu1~16.04.4+esm1"
        },
        {
            "binary_name": "lxd-tools",
            "binary_version": "2.0.11-0ubuntu1~16.04.4+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23953.json"

Ubuntu:Pro:18.04:LTS / lxd

Package

Name
lxd
Purl
pkg:deb/ubuntu/lxd@3.0.3-0ubuntu1~18.04.2+esm1?arch=source&distro=esm-infra/bionic

Affected ranges

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

Affected versions

2.*
2.18-0ubuntu6
2.19-0ubuntu1
2.20-0ubuntu3
2.20-0ubuntu4
2.21-0ubuntu1
2.21-0ubuntu2
2.21-0ubuntu3
2.21-0ubuntu4
3.*
3.0.0~beta2-0ubuntu3
3.0.0~beta3-0ubuntu3
3.0.0~beta5-0ubuntu2
3.0.0~beta7-0ubuntu1
3.0.0-0ubuntu1
3.0.0-0ubuntu2
3.0.0-0ubuntu3
3.0.0-0ubuntu4
3.0.1-0ubuntu1~18.04.1
3.0.2-0ubuntu1~18.04.1
3.0.3-0ubuntu1~18.04.1
3.0.3-0ubuntu1~18.04.2
3.0.3-0ubuntu1~18.04.2+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "lxd",
            "binary_version": "3.0.3-0ubuntu1~18.04.2+esm1"
        },
        {
            "binary_name": "lxd-client",
            "binary_version": "3.0.3-0ubuntu1~18.04.2+esm1"
        },
        {
            "binary_name": "lxd-tools",
            "binary_version": "3.0.3-0ubuntu1~18.04.2+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23953.json"

Ubuntu:20.04:LTS / lxd

Package

Name
lxd
Purl
pkg:deb/ubuntu/lxd@1:0.10?arch=source&distro=focal

Affected ranges

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

Affected versions

1:0.*
1:0.7
1:0.8
1:0.9
1:0.10

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "lxd",
            "binary_version": "1:0.10"
        },
        {
            "binary_name": "lxd-client",
            "binary_version": "1:0.10"
        },
        {
            "binary_name": "lxd-tools",
            "binary_version": "1:0.10"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23953.json"

Ubuntu:Pro:24.04:LTS / incus

Package

Name
incus
Purl
pkg:deb/ubuntu/incus@6.0.0-1ubuntu0.3+esm2?arch=source&distro=esm-apps/noble

Affected ranges

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

Affected versions

0.*
0.4-1ubuntu1
0.5.1-1
0.5.1-3
0.6-1
6.*
6.0.0-1
6.0.0-1ubuntu0.1
6.0.0-1ubuntu0.2
6.0.0-1ubuntu0.2+esm1
6.0.0-1ubuntu0.3
6.0.0-1ubuntu0.3+esm1
6.0.0-1ubuntu0.3+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-github-lxc-incus-dev",
            "binary_version": "6.0.0-1ubuntu0.3+esm2"
        },
        {
            "binary_name": "incus",
            "binary_version": "6.0.0-1ubuntu0.3+esm2"
        },
        {
            "binary_name": "incus-agent",
            "binary_version": "6.0.0-1ubuntu0.3+esm2"
        },
        {
            "binary_name": "incus-client",
            "binary_version": "6.0.0-1ubuntu0.3+esm2"
        },
        {
            "binary_name": "incus-migrate",
            "binary_version": "6.0.0-1ubuntu0.3+esm2"
        },
        {
            "binary_name": "incus-tools",
            "binary_version": "6.0.0-1ubuntu0.3+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23953.json"

Ubuntu:25.10 / incus

Package

Name
incus
Purl
pkg:deb/ubuntu/incus@6.0.4-2?arch=source&distro=questing

Affected ranges

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

Affected versions

6.*
6.0.3-4
6.0.4-2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "golang-github-lxc-incus-dev",
            "binary_version": "6.0.4-2"
        },
        {
            "binary_name": "incus",
            "binary_version": "6.0.4-2"
        },
        {
            "binary_name": "incus-agent",
            "binary_version": "6.0.4-2"
        },
        {
            "binary_name": "incus-base",
            "binary_version": "6.0.4-2"
        },
        {
            "binary_name": "incus-client",
            "binary_version": "6.0.4-2"
        },
        {
            "binary_name": "incus-extra",
            "binary_version": "6.0.4-2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23953.json"