Incus vulnerable to antispoofing nftables firewall rule bypass on bridge networks with ACLs (lxc incus)
At a glance
- Source
- NVD
- EPSS
- EPSS 0.23 % · percentile 14 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- GitHub_M
- NVD status
- Deferred
Description
Incus is a system container and virtual machine manager. When using an ACL on a device connected to a bridge, Incus versions 6.12 and 6.13generates nftables rules that partially bypass security options `security.mac_filtering`, `security.ipv4_filtering` and `security.ipv6_filtering`. This can lead to ARP spoofing on the bridge and to fully spoof another VM/container on the same bridge. Commit 254dfd2483ab8de39b47c2258b7f1cf0759231c8 contains a patch for the issue.
Weaknesses (CWE)
- CWE-863 — Incorrect Authorization
References
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:H | GitHub_M |
| CVSS 3.1 | HIGH 8.1 | CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:H | NVD · security-advisories@github.com (Secondary) |
Advisories
- GHSA-p7fw-vjjm-2rwp — Incus creates nftables rules that partially bypass security options
- GO-2025-3782 — Incus creates nftables rules that partially bypass security options in github.com/lxc/incus
European references
- ENISA EUVD · EUVD-2025-19114
- GCVE · GCVE-0-2025-52890
Affected products
| Product | Versions |
|---|---|
| lxc · incus | affected >= 6.12, <= 6.13 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |