lxc incus up to 6.x backup/index.yaml backup.GetInfo null pointer dereference

Summaryinfo

A vulnerability was found in lxc incus up to 6.x. It has been declared as problematic. This affects the function backup.GetInfo of the file backup/index.yaml. Executing a manipulation can lead to null pointer dereference. The identification of this vulnerability is CVE-2026-41684. The attack may be launched remotely. There is no exploit available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic was found in lxc incus up to 6.x. This vulnerability affects the function backup.GetInfo of the file backup/index.yaml. The manipulation with an unknown input leads to a null pointer dereference vulnerability. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect availability. CVE summarizes:

Incus is a system container and virtual machine manager. Prior to version 7.0.0, backup.GetInfo() trusts the inline backup/index.yaml config when present and only falls back to parsing the legacy backup/container/backup.yaml file if result.Config == nil. As a result, an archive can carry a valid inline config that passes the initial import preflight while also carrying a malformed legacy backup/container/backup.yaml file that is reparsed later from the restored file system. ParseConfigYamlFile() accepts YAML documents with no container section, and multiple downstream consumers then dereference. Container without checking for nil. Confirmed examples in the instance restore and import flow include backup.UpdateInstanceConfig() and internalImportFromBackup(). An authenticated user with permission to import instance backups may be able to crash the Incus daemon with a crafted backup archive whose inline backup/index.yaml is valid but whose extracted legacy backup.yaml omits container. The crash occurs in the restore path after archive extraction has begun. This issue has been patched in version 7.0.0.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-41684 since 04/22/2026. The exploitation appears to be easy. The attack can be initiated remotely. There are known technical details, but no exploit is available.

Upgrading to version 7.0.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

• lxc

Name

• incus

Version

• 6.x

Website

• Product: https://github.com/lxc/incus/

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