CVE-2026-9640

LXD Snapshot Import Privilege Escalation Vulnerability

Published Jun 26, 2026 CVSS 3.1 · 7.2 High EPSS < 1% KEV · Not listed
Description
A privilege escalation vulnerability exists in LXD from 6.0 before 6.9, 5.21.0 before 5.21.5, and 5.0.0 before 5.0.7 regarding the handling of project-restriction policies during snapshot restoration.. An authenticated project operator in a restricted multi-tenant environment can bypass policy restrictions by importing a maliciously crafted instance backup containing restricted configuration keys within a snapshot. When the snapshot is restored, these restricted keys are applied to the live instance without policy validation. Starting the modified instance grants the operator unauthorized host root access.

Remediation

Vendor Solution

Upgrade to LXD version 6.9 or later, 5.21.5 or later, or 5.0.7 or later.

Tracking

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Advisories

Source ID Title
Debian DSA Debian DSA DSA-6373-1 lxd security update
History
Type Values Removed Values Added
First Time appeared Canonical
Canonical lxd
Vendors & Products Canonical
Canonical lxd
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A privilege escalation vulnerability exists in LXD from 6.0 before 6.9, 5.21.0 before 5.21.5, and 5.0.0 before 5.0.7 regarding the handling of project-restriction policies during snapshot restoration.. An authenticated project operator in a restricted multi-tenant environment can bypass policy restrictions by importing a maliciously crafted instance backup containing restricted configuration keys within a snapshot. When the snapshot is restored, these restricted keys are applied to the live instance without policy validation. Starting the modified instance grants the operator unauthorized host root access.
Title LXD Snapshot Import Privilege Escalation Vulnerability
Weaknesses CWE-863
References
Metrics cvssV3_1

{'score': 7.2, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
canonical
Published
Updated
Jun 30, 2026, 3:55 AM
Reserved
May 26, 2026, 6:31 PM
Status
Analyzed
Published
Jun 26, 2026, 4:16 PM
Modified
Oct 25, 2026, 5:10 PM