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CVE-2026-9640— LXD Snapshot Import Privilege Escalation Vulnerability

Quick assessment

Affected
Canonical LXD
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Canonical LXD是英国Canonical公司开源的一款基于Linux系统用于管理应用程序的容器。 LXD 6.0至6.9之前版本、5.21.0至5.21.5之前版本和5.0.0至5.0.7之前版本存在授权问题漏洞，该漏洞源于快照恢复期间的项目限制策略处理问题，可能导致身份验证的项目操作员在受限多租户环境中导入包含受限制配置密钥的恶意备份，恢复后密钥未经策略验证应用于实例，启动修改后实例可获取未授权的主机root访问权限。

CVSS 7.2 · High EPSS 0.63% · P48

Affected Version Matrix 3

VendorProduct Version RangeStatus
Canonical LXD 5.21.0< 5.21.5 affected
5.0.0< 5.0.7 affected
6.0< 6.9 affected
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I. Basic Information for CVE-2026-9640

Vulnerability Information
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Vulnerability Title
LXD Snapshot Import Privilege Escalation Vulnerability
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical LXD 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Canonical LXD是英国Canonical公司开源的一款基于Linux系统用于管理应用程序的容器。 LXD 6.0至6.9之前版本、5.21.0至5.21.5之前版本和5.0.0至5.0.7之前版本存在授权问题漏洞，该漏洞源于快照恢复期间的项目限制策略处理问题，可能导致身份验证的项目操作员在受限多租户环境中导入包含受限制配置密钥的恶意备份，恢复后密钥未经策略验证应用于实例，启动修改后实例可获取未授权的主机root访问权限。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Canonical LXD 5.21.0 ~ 5.21.5 -

II. Public POCs for CVE-2026-9640

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 11446 chars
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In-depth vulnerability mechanism
Trigger conditions & impact
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POC zip download
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III. Intelligence Information for CVE-2026-9640

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Patches & Fixes for CVE-2026-9640 (2)

Vendor Advisories for CVE-2026-9640 (1)

Same Patch Batch · Canonical · 2026-06-26 · 4 CVEs total

CVE-2026-12411 8.4 HIGH Broken Access Control in Canonical LXD DevLXD API
CVE-2026-9639 6.5 MEDIUM Authenticated Denial of Service via Malicious Backup Tarball in LXD
CVE-2026-28385 5.0 MEDIUM SSRF via image import from URL allows internal network probing by authenticated users

IV. Related Vulnerabilities

Same product: LXD
Same vendor: Canonical
Same weakness: CWE-863

V. Comments for CVE-2026-9640

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