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CVE-2026-85185

Path traversal in LXD btrfs storage driver allows arbitrary file deletion and write on host as root

CVSS 3.1 9.6 CRITICALCheck source for fixed versionsKEV status unknown

Original advisory

Historical advisory recorded 23 Oct 2026 15:48:27 UTC. Read the latest advisory.

cve-program · CVE-2026-85185

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-85185

Published

LXD

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "Canonical",
                    "product": "LXD",
                    "platforms": [
                        "Linux"
                    ],
                    "packageName": "LXD",
                    "repo": "https://github.com/canonical/lxd",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "4.0.2",
                            "lessThan": "4.0.14",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "5.0.0",
                            "lessThan": "5.0.10",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "5.21.0",
                            "lessThan": "5.21.8",
                            "versionType": "semver"
                        },
                        {
                            "status": "affected",
                            "version": "6.0",
                            "lessThan": "6.10",
                            "versionType": "semver"
                        }
                    ],
                    "defaultStatus": "unaffected"
                }

Original source record · Cite this exact observation · Complete original publisher JSON