CVE-2026-40251
Description
Incus is a system container and virtual machine manager. In versions before 7.0.0, missing validation logic in the storage volume import logic allows an authenticated user with access to the storage volume feature to cause the Incus daemon to crash. The backup restore subsystem contains an out-of-bounds panic vulnerability caused by an invalid bounds check when indexing snapshot metadata arrays, and the same flawed pattern also appears in the migration path. When iterating through physical snapshots provided in a backup archive, the loop uses the index to look up corresponding metadata in the parsed `Config.Snapshots` and `Config.VolumeSnapshots` slices. The guard condition `len(slice) >= i-1` is incorrect because it can still evaluate to true when the subsequent slice[i] access is out of bounds. An attacker can submit a backup archive that contains physical snapshot directories while supplying a tampered `index.yaml` with an empty or truncated snapshot metadata array, causing the daemon to index beyond the end of the metadata slice and crash. Repeated use of this issue can be used to keep Incus offline, causing a denial of service. This issue is fixed in version 7.0.0.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Fixed 4 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.0.4-2+deb13u7 |
| sid | Fixed | 7.0.0-1 |
| forky | Fixed | 7.0.0-1 |
| bookworm | Fixed | 5.0.2-5+deb12u6 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | github.com/lxc/incus/v6/cmd/incusd | <7.0.0 | 7.0.0 |
| GO | github.com/lxc/incus/v6/cmd/incusd | < 7.0.0 | 7.0.0 |
Application impact
| Vendor | Product | Versions | Fixed |
|---|---|---|---|
| linuxcontainers | incus | {"endExcluding":"7.0.0"} | 7.0.0 |
References
- https://github.com/lxc/incus/blob/v6.22.0/internal/server/storage/backend.go
- https://github.com/lxc/incus/security/advisories/GHSA-4m88-wxj4-9qj6
- https://nvd.nist.gov/vuln/detail/CVE-2026-40251
- https://github.com/lxc/incus
- https://security-tracker.debian.org/tracker/CVE-2026-40251
- https://github.com/advisories/GHSA-4m88-wxj4-9qj6
CWEs
CWE-129
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.