UBUNTU-CVE-2026-85185

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Source
https://ubuntu.com/security/CVE-2026-85185
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-85185.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-85185
Upstream
Published
2026-09-29T00:00:00Z
Modified
2026-09-29T23:42:27Z
Severity
  • 9.6 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Path traversal in the btrfs storage driver in Canonical LXD versions 4.0.2 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client with permission to create instances in a project to delete arbitrary files on the host as root. On hosts whose root filesystem is btrfs, the client can also place attacker-controlled content at arbitrary host paths, leading to full host compromise. The client does this with a crafted subvolume path containing ../ sequences, sent in either of two ways: in the optimized_header.yaml of an optimized btrfs backup, or in the btrfs migration header sent by a malicious migration source.

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-2026-85185.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-2026-85185.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-2026-85185.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-2026-85185.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-2026-85185.json"