Vulnerability Report

CVE-2026-9640

Title: LXD Privilege Escalation via Snapshot Restoration Bypass

Auth Bypass

Proof Of Concept

No public PoC currently indexed for CVE-2026-9640.

CWE Category CWE-863

Published Date Jun 26, 2026

Modified Date Jul 02, 2026

Exploit Status Not Found

Score 7.2 CVSS v3.1

Exploit Probability (EPSS)

0.34%

Vulnerability Summary

CVE-2026-9640: 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.

Impacted Vendors

canonical 1

linuxcontainers 1

Reference Links

https://github.com/canonical/lxd/pull/18301 https://github.com/canonical/lxd/pull/18303 https://github.com/canonical/lxd/pull/18304 https://github.com/canonical/lxd/security/advisories/GHSA-ppq7-4492-5552

CVSS v3.1

Source Entity [email protected]

Severity HIGH

7.2

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Associated Attack Patterns (CAPEC)

Total: Patterns