UBUNTU-CVE-2026-23954

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Source
https://ubuntu.com/security/CVE-2026-23954
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23954.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-23954
Upstream
Published
2026-01-22T22:16:00Z
Modified
2026-01-30T20:32:07.983427Z
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. Versions 6.21.0 and below allow a user with the ability to launch a container with a custom image (e.g a member of the ‘incus’ group) to use directory traversal or symbolic links in the templating functionality to achieve host arbitrary file read, and host arbitrary file write. This ultimately results in arbitrary command execution on the host. When using an image with a metadata.yaml containing templates, both the source and target paths are not checked for symbolic links or directory traversal. This can also be exploited in IncusOS. 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_version": "2.0.11-0ubuntu1~16.04.4+esm1",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23954.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_version": "3.0.3-0ubuntu1~18.04.2+esm1",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23954.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_version": "1:0.10",
            "binary_name": "lxd"
        },
        {
            "binary_version": "1:0.10",
            "binary_name": "lxd-client"
        },
        {
            "binary_version": "1:0.10",
            "binary_name": "lxd-tools"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23954.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_version": "6.0.0-1ubuntu0.3+esm2",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23954.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_version": "6.0.4-2",
            "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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-23954.json"