CVE-2026-9640 Details
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.
A privilege escalation vulnerability has been identified in LXD versions 6.0 prior to 6.9, 5.21.0 prior to 5.21.5, and 5.0.0 prior to 5.0.7. The issue arises from improper handling of project-restriction policies during the restoration of snapshots. In a restricted multi-tenant environment, an authenticated project operator can exploit this vulnerability by importing a maliciously crafted instance backup that contains restricted configuration keys. When the snapshot is restored, these keys are applied to the live instance without proper policy validation, granting the operator unauthorized root access on the host.
Users can upgrade to LXD versions 6.9, 5.21.5, or 5.0.7 to address this vulnerability.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 26, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/canonical/lxd/security/advisories/GHSA-ppq7-4492-5552 | CISA-ADP | Exploit |
| https://github.com/canonical/lxd/pull/18301 | [email protected] | Issue TrackingPatch |
| https://github.com/canonical/lxd/pull/18303 | [email protected] | Issue TrackingPatch |
| https://github.com/canonical/lxd/pull/18304 | [email protected] | Issue TrackingPatch |
| https://github.com/canonical/lxd/security/advisories/GHSA-ppq7-4492-5552 | [email protected] | Exploit |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-863 | Incorrect Authorization | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| canonical lxd | >= 4.12, < 5.0.7 >= 5.21.0, < 5.21.5 >= 6.0, < 6.9 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 2, 2026 | Initial Analysis | [email protected] |
| Jun 30, 2026 | CVE Modified | CISA-ADP |
| Jun 27, 2026 | CVE Modified | CISA-ADP |
| Jun 26, 2026 | CVE Modified | CISA-ADP |
| Jun 26, 2026 | New CVE Received | [email protected] |