CVE-2025-52890: Auth Bypass (CVSS 8.1)

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.

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CVSS v3.1 Score

8.1

HIGH

CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:H

Weakness Type (CWE)

CWE-863 Incorrect Authorization

References

Other References

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

Frequently Asked Questions

What is CVE-2025-52890? +

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. It has a CVSS v3.1 base score of 8.1 (HIGH).

How severe is CVE-2025-52890? +

CVE-2025-52890 has a CVSS v3.1 score of 8.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

How do I check if I'm vulnerable to CVE-2025-52890? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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