TI-2026-08468 Aliases CVE-2026-9640

LXD Snapshot Import Privilege Escalation Vulnerability

HIGH 67CWE-863Published 2026-06-26 · Updated 2026-06-30

Key facts

Attack vector: Network
Privileges required: High
User interaction: None
Attack complexity: Low
Impact type: Security bypass
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-863.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00632 50th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed LXD (Canonical): 5.21.5, 5.0.7, 6.9

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Canonical	LXD	5.21.0 to before 5.21.5; 5.0.0 to before 5.0.7; 6.0 to before 6.9	5.21.5, 5.0.7, 6.9	Patch available	CNA

LXD VendorCanonical Affected 5.21.0 to before 5.21.5; 5.0.0 to before 5.0.7; 6.0 to before 6.9 Fixed in 5.21.5, 5.0.7, 6.9 Patch available CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:canonical:lxd::::::::	4.12 to before 5.0.7; 5.21.0 to before 5.21.5; 6.0 to before 6.9	Vulnerable	Canonical

cpe:2.3:a:canonical:lxd:*:*:*:*:*:*:*:* Versions 4.12 to before 5.0.7; 5.21.0 to before 5.21.5; 6.0 to before 6.9 Vulnerable ·Canonical

Remediation

Fix · CNA LXD (Canonical) Fixed in 5.21.5, 5.0.7, 6.9

Timeline

2026-10-02 Threatist record created from CVE-2026-9640
2026-10-25 EPSS moved to the 50th–90th percentile

References

Exploit 1

https://github.com/canonical/lxd/security/advisories/GHSA-ppq7-4492-5552

Patch 3

TI-2026-22659 Authenticated RCE via unsanitized compression_algorithm CVSS 4.0CRITICAL 9.4
TI-2026-47475 Path traversal via unvalidated instance name in backup tarball restore enables root file write / RCE CVSS 3.1CRITICAL 9.9
TI-2026-45146 Cross-project instance move bypasses all project restrictions allowing host command execution CVSS 3.1CRITICAL 9.9
TI-2026-45143 Cross-project instance copy bypasses target project restrictions via TOCTOU in config merge CVSS 3.1CRITICAL 9.9
TI-2026-45142 Project restriction bypass via instance migration config override CVSS 3.1CRITICAL 9.9
TI-2026-45140 Root RCE via image backup.yaml symlink CVSS 3.1CRITICAL 9.9

See all 34 →

Sources

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