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CVE-2026-63298— LXD arbitrary lxc.conf directive injection via NVIDIA instance configuration

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。 Canonical LXD 5.0.0版本至5.0.8之前版本、5.21.0版本至5.21.6之前版本和4.0.0版本至4.0.12之前版本存在命令注入漏洞，该漏洞源于NVIDIA实例配置处理中对特殊元素中和不当，经过身份验证的攻击者可通过在'nvidia.driver.capabilities'或'nvidia.require.*'配置值中注入换行字符来操纵生成的lxc.conf文件，从而以LXD

CVSS 8.7 · Critical EPSS 0.69% · P51

Affected Version Matrix 3

VendorProduct Version RangeStatus
Canonical LXD 5.0.0< 5.0.8 affected
5.21.0< 5.21.6 affected
4.0.0< 4.0.12 affected
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I. Basic Information for CVE-2026-63298

Vulnerability Information
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Vulnerability Title
LXD arbitrary lxc.conf directive injection via NVIDIA instance configuration
Source: CVE Program / CVE List V5
Vulnerability Description
An improper neutralization of special elements vulnerability in LXD's NVIDIA instance configuration handling allows an authenticated attacker to inject arbitrary configuration directives. By supplying newline characters within the 'nvidia.driver.capabilities' or 'nvidia.require.*' configuration values, an attacker can manipulate the generated lxc.conf file. This flaw enables the attacker to execute arbitrary code on the host system with the privileges of the LXD daemon.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Canonical LXD 命令注入漏洞
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 5.0.0版本至5.0.8之前版本、5.21.0版本至5.21.6之前版本和4.0.0版本至4.0.12之前版本存在命令注入漏洞，该漏洞源于NVIDIA实例配置处理中对特殊元素中和不当，经过身份验证的攻击者可通过在'nvidia.driver.capabilities'或'nvidia.require.*'配置值中注入换行字符来操纵生成的lxc.conf文件，从而以LXD
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 5.0.0 ~ 5.0.8 -

II. Public POCs for CVE-2026-63298

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 7210 chars
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Trigger conditions & impact
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Exploit chain & mitigation
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III. Intelligence Information for CVE-2026-63298

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Vendor Advisories for CVE-2026-63298 (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-2026-63299 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
CVE-2026-63295 4.3 MEDIUM Project restriction `restricted.containers.privilege=isolated` bypassable by omitting `sec

IV. Related Vulnerabilities

Same product: LXD
Same vendor: Canonical
Same weakness: CWE-78

V. Comments for CVE-2026-63298

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