PT-2026-52844 · Canonical · Lxd

Miha Purg · Published 2026-06-26 · Updated 2026-06-26 · CVE-2026-9640

Mitre

CVSS v3.1

7.2

High

Base vector

AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

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.

Fix

Incorrect Authorization

Weakness Enumeration

CWE-863

Related Identifiers

CVE-2026-9640

Affected Products

Lxd

References · 5

• https://github.com/canonical/lxd/pull/18301 · Patch
• https://github.com/canonical/lxd/pull/18303 · Patch
• https://github.com/canonical/lxd/security/advisories/GHSA-ppq7-4492-5552 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-9640 · Security Note
• https://github.com/canonical/lxd/pull/18304 · Patch