CVE-2026-63298

LXD arbitrary lxc.conf directive injection via NVIDIA instance configuration

State: Published
Severity: 8.7 High
Published: Aug 12, 2026
Updated: Aug 13, 2026
Reserved: Jul 16, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.7 High	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H	canonical

Weaknesses

CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Affected Products

Product	Versions
LXDCanonical	5.0.0 to before 5.0.8Affected 5.21.0 to before 5.21.6Affected 4.0.0 to before 4.0.12Affected

References

https://github.com/canonical/lxd/security/advisories/GHSA-vfh7-q59q-54v2vdb-entryvendor-advisory

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