CVE-2026-63298: Canonical Lxd

Critical severity, CVSS 9.9. EPSS: 0.7% chance of exploitation in the next 30 days.

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.

Affected products

• Canonical Lxd: from 4.0.0, before 4.0.12 (fixed in 4.0.12); from 5.0.0, before 5.0.8 (fixed in 5.0.8); from 5.1, before 5.21.6 (fixed in 5.21.6); from 6.0, up to and including 6.9

Published 2026-08-12. Last modified 2026-09-11.