PT-2026-37148 · Incus · Incus

Ectario + 1 · Published 2026-05-04 · Updated 2026-05-07 · CVE-2026-41684

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Incus versions prior to 7.0.0

Description An authenticated user with permissions to import instance backups can crash the Incus daemon using a specially crafted backup archive. The issue occurs because the backup.GetInfo() function trusts the inline backup/index.yaml configuration and only parses the legacy backup/container/backup.yaml file if the initial configuration is null. A malicious archive can contain a valid inline configuration to pass initial checks but include a malformed legacy backup.yaml file that omits the container section.

When the archive is extracted, the ParseConfigYamlFile() function accepts the YAML document without a container section. Subsequently, functions such as backup.UpdateInstanceConfig() and internalImportFromBackup() attempt to dereference the .Container variable without checking if it is null, leading to a nil-pointer dereference and a system crash during the restore path.

Recommendations Update to version 7.0.0.

Fix

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

CVE-2026-41684

GHSA-X5R6-JR56-89PV

Affected Products

Incus

References · 13

• https://github.com/lxc/incus/security/advisories/GHSA-x5r6-jr56-89pv · Vendor Advisory
• https://github.com/lxc/incus/releases/tag/v7.0.0 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-41684 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-41684 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-41684 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-41684 · Security Note
• https://osv.dev/vulnerability/GHSA-x5r6-jr56-89pv · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2026-41684 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2026-41684 · Security Note
• https://github.com/lxc/incus · Note
• https://github.com/lxc/incus/pull/3273 · Note
• https://t.me/CVEtracker/52981 · Telegram Post
• https://twitter.com/CVEnew/status/2052400759636168966 · Twitter Post