Canonical LXD up to 4.0.11/5.0.7/5.21.5 Configuration lxc.conf nvidia.driver.capabilities/nvidia.require.* neutralization

Summaryinfo

A vulnerability was found in Canonical LXD up to 4.0.11/5.0.7/5.21.5 and classified as very critical. Impacted is an unknown function of the file lxc.conf of the component Configuration Handler. Executing a manipulation of the argument nvidia.driver.capabilities/nvidia.require.* can lead to neutralization. This vulnerability appears as CVE-2026-63298. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability has been found in Canonical LXD up to 4.0.11/5.0.7/5.21.5 and classified as very critical. This vulnerability affects an unknown code of the file lxc.conf of the component Configuration Handler. The manipulation of the argument nvidia.driver.capabilities/nvidia.require.* with an unknown input leads to a neutralization vulnerability. The CWE definition for the vulnerability is CWE-707. The product does not ensure or incorrectly ensures that structured messages or data are well-formed and that certain security properties are met before being read from an upstream component or sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-63298 since 07/16/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/12/2026).

Upgrading to version 4.0.12, 5.0.8 or 5.21.6 eliminates this vulnerability.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Vendor

• Canonical

Name

• LXD

Version

• 4.0.0
• 4.0.1
• 4.0.2
• 4.0.3
• 4.0.4
• 4.0.5
• 4.0.6
• 4.0.7
• 4.0.8
• 4.0.9
• 4.0.10
• 4.0.11
• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.21.0
• 5.21.1
• 5.21.2
• 5.21.3
• 5.21.4
• 5.21.5

License

• open-source

Website

• Product: https://github.com/canonical/lxd/

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