LXD Snapshot Import Privilege Escalation Vulnerability

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Summary

CVECVE-2026-9640
StatePUBLISHED
Assignercanonical
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-26 16:16:37 UTC
Updated2026-06-26 17:16:35 UTC
DescriptionA 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.

Risk And Classification

Primary CVSS: v3.1 7.2 HIGH from [email protected]

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

Problem Types: CWE-863 | CWE-863 CWE-863: Incorrect Authorization

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
3.1CNACVSS7.2HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Canonical LXD affected 5.21.0 5.21.5 semver Linux
CNA Canonical LXD affected 5.0.0 5.0.7 semver Linux
CNA Canonical LXD affected 6.0 6.9 semver Linux

References

ReferenceSourceLinkTags
github.com/canonical/lxd/pull/18303 [email protected] github.com
github.com/canonical/lxd/pull/18301 [email protected] github.com
github.com/canonical/lxd/pull/18304 [email protected] github.com
github.com/canonical/lxd/security/advisories/GHSA-ppq7-4492-5552 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Miha Purg (en)

Additional Advisory Data

Solutions

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

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