UBUNTU-CVE-2026-85526

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Source
https://ubuntu.com/security/CVE-2026-85526
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85526.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-85526
Upstream
Published
2026-09-29T00:00:00Z
Modified
2026-09-29T23:42:20Z
Severity
  • 9.9 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a crafted subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import.

References

Affected packages

Ubuntu:Pro:16.04:LTS / lxd

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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
2.0.11-0ubuntu1~16.04.4+esm2
2.0.11-0ubuntu1~16.04.4+esm3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "golang-github-lxc-lxd-dev",
            "binary_version":  "2.0.11-0ubuntu1~16.04.4+esm3"
        },
        {
            "binary_name":  "lxc2",
            "binary_version":  "2.0.11-0ubuntu1~16.04.4+esm3"
        },
        {
            "binary_name":  "lxd",
            "binary_version":  "2.0.11-0ubuntu1~16.04.4+esm3"
        },
        {
            "binary_name":  "lxd-client",
            "binary_version":  "2.0.11-0ubuntu1~16.04.4+esm3"
        },
        {
            "binary_name":  "lxd-tools",
            "binary_version":  "2.0.11-0ubuntu1~16.04.4+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85526.json"

Ubuntu:Pro:18.04:LTS / lxd

Package

Name
lxd
Purl
pkg:deb/ubuntu/lxd?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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
3.0.3-0ubuntu1~18.04.2+esm2
3.0.3-0ubuntu1~18.04.2+esm3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "lxd",
            "binary_version":  "3.0.3-0ubuntu1~18.04.2+esm3"
        },
        {
            "binary_name":  "lxd-client",
            "binary_version":  "3.0.3-0ubuntu1~18.04.2+esm3"
        },
        {
            "binary_name":  "lxd-tools",
            "binary_version":  "3.0.3-0ubuntu1~18.04.2+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85526.json"

Ubuntu:20.04:LTS / lxd

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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-2026-85526.json"

Ubuntu:Pro:24.04:LTS / incus

Package

Name
incus
Purl
pkg:deb/ubuntu/incus?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown 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
6.0.0-1ubuntu0.3+esm3

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "golang-github-lxc-incus-dev",
            "binary_version":  "6.0.0-1ubuntu0.3+esm3"
        },
        {
            "binary_name":  "incus",
            "binary_version":  "6.0.0-1ubuntu0.3+esm3"
        },
        {
            "binary_name":  "incus-agent",
            "binary_version":  "6.0.0-1ubuntu0.3+esm3"
        },
        {
            "binary_name":  "incus-client",
            "binary_version":  "6.0.0-1ubuntu0.3+esm3"
        },
        {
            "binary_name":  "incus-migrate",
            "binary_version":  "6.0.0-1ubuntu0.3+esm3"
        },
        {
            "binary_name":  "incus-tools",
            "binary_version":  "6.0.0-1ubuntu0.3+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85526.json"

Ubuntu:Pro:26.04:LTS / incus

Package

Name
incus
Purl
pkg:deb/ubuntu/incus?arch=source&distro=esm-apps%2Fresolute

Affected ranges

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

Affected versions

6.*
6.0.4-2
6.0.5-8
6.0.5-8ubuntu0.26.04.1~esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "golang-github-lxc-incus-dev",
            "binary_version":  "6.0.5-8ubuntu0.26.04.1~esm1"
        },
        {
            "binary_name":  "incus",
            "binary_version":  "6.0.5-8ubuntu0.26.04.1~esm1"
        },
        {
            "binary_name":  "incus-agent",
            "binary_version":  "6.0.5-8ubuntu0.26.04.1~esm1"
        },
        {
            "binary_name":  "incus-base",
            "binary_version":  "6.0.5-8ubuntu0.26.04.1~esm1"
        },
        {
            "binary_name":  "incus-client",
            "binary_version":  "6.0.5-8ubuntu0.26.04.1~esm1"
        },
        {
            "binary_name":  "incus-extra",
            "binary_version":  "6.0.5-8ubuntu0.26.04.1~esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85526.json"