CVE-2026-63295— Project restriction `restricted.containers.privilege=isolated` bypassable by omitting `security.idmap.isolated`
Quick assessment
Affected
Canonical LXD
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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。 Canonical LXD 4.0.0至4.0.12之前版本、5.0.0至5.0.8之前版本、5.21.0至5.21.6之前版本和6.0至6.10之前版本存在授权问题漏洞，该漏洞源于授权绕过问题，即当实例配置省略security.idmap.isolated键时，LXD未能强制执行项目配置的容器特权限制，可能导致经过身份验证的攻击者创建或更新实例时绕过项目级容器隔离限制。
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I. Basic Information for CVE-2026-63295
Vulnerability Information
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Vulnerability Title
Project restriction `restricted.containers.privilege=isolated` bypassable by omitting `security.idmap.isolated`
Source: CVE Program / CVE List V5
Vulnerability Description
An authorization bypass vulnerability in LXD allows an authenticated attacker to bypass project-level container isolation restrictions. When a project is configured with restrictions on container privileges (such as enforcing restricted.containers.privilege=isolated), LXD fails to enforce the requirement if an instance configuration omits the security.idmap.isolated key. An attacker can exploit this flaw by creating or updating an instance without explicitly setting security.idmap.isolated, bypassing the target project's security constraints.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
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。 Canonical LXD 4.0.0至4.0.12之前版本、5.0.0至5.0.8之前版本、5.21.0至5.21.6之前版本和6.0至6.10之前版本存在授权问题漏洞，该漏洞源于授权绕过问题，即当实例配置省略security.idmap.isolated键时，LXD未能强制执行项目配置的容器特权限制，可能导致经过身份验证的攻击者创建或更新实例时绕过项目级容器隔离限制。
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
II. Public POCs for CVE-2026-63295
| # | POC Description | Source Link | Shenlong Link |
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Vendor Advisories for CVE-2026-63295 (1)
Same Patch Batch · Canonical · 2026-08-12 · 11 CVEs total
| CVE-2026-62420 | 9.9 CRITICAL | Cross-project cluster migration bypasses project restrictions via cluster notification fla |
| CVE-2026-63300 | 9.9 CRITICAL | Cross-project instance move bypasses all project restrictions allowing host command execut |
| CVE-2026-63296 | 9.9 CRITICAL | Project restriction bypass via instance migration config override |
| CVE-2026-63293 | 9.9 CRITICAL | Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as |
| CVE-2026-63294 | 9.9 CRITICAL | Root RCE via image backup.yaml symlink |
| CVE-2026-63297 | 9.9 CRITICAL | Cross-project instance copy bypasses target project restrictions via TOCTOU in config merg |
| CVE-2026-66898 | 9.9 CRITICAL | Path traversal via unvalidated instance name in backup tarball restore enables root file w |
| CVE-2026-63298 | 8.7 HIGH | LXD arbitrary lxc.conf directive injection via NVIDIA instance configuration |
| CVE-2026-63299 | 8.5 HIGH | Storage volume cross-project move and snapshot restore bypass project disk limits |
| CVE-2026-16033 | 8.5 HIGH | Arbitrary file read+write on host via templates/ symlink in malicious image |
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