CVE-2025-52889: Incus Allocation of Resources Without Limits allows firewall rule bypass on managed bridge networks

June 26, 2025 (updated June 28, 2025)

When using an ACL on a device connected to a bridge, Incus generates nftables rules for local services (DHCP, DNS…) that partially bypass security options security.mac_filtering, security.ipv4_filtering and security.ipv6_filtering. This can lead to DHCP pool exhaustion and opens the door for other attacks.

References

github.com/advisories/GHSA-9q7c-qmhm-jv86
github.com/lxc/incus
github.com/lxc/incus/commit/2516fb19ad8428454cb4edfe70c0a5f0dc1da214
github.com/lxc/incus/commit/a7c33301738aede3c035063e973b1d885d9bac7c
github.com/lxc/incus/security/advisories/GHSA-9q7c-qmhm-jv86
nvd.nist.gov/vuln/detail/CVE-2025-52889

Code Behaviors & Features

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