CVE-2025-52890Public exploit

Instance traffic interception via premature nftables accepts

Published Jun 25, 2025 · Updated Jun 25, 2025

Incorrect authorization in Incus 6.12.0 and 6.13.0 allows guest OS users to spoof another instance on an attached bridge. The nftables bridge-input template places established-connection, ARP, and IPv6 neighbor-advertisement accepts before MAC and IP filtering drops. An ACL must apply to a bridged NIC, and the attacker needs high privileges inside a guest; successful spoofing redirects host or forwarded traffic.

CVSS severity8.1
High
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect authorization in Incus 6.12.0 and 6.13.0 allows guest OS users to spoof another instance on an attached bridge. The nftables bridge-input template places established-connection, ARP, and IPv6 neighbor-advertisement accepts before MAC and IP filtering drops. An ACL must apply to a bridged NIC, and the attacker needs high privileges inside a guest; successful spoofing redirects host or forwarded traffic.

The record

CVE
CVE-2025-52890
Published
Jun 25, 2025
Updated
Jun 25, 2025
Vendor
Linux Containers
Product
Incus
Classifications
CWE-863, T1557.002
Attack vector
adjacent
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2025CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=>= 6.12, <= 6.13

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesauthenticated

What is affected?

Linux Containers · Incusversion=>= 6.12, <= 6.13

Published CVSS scores

8.1GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-863Incorrect Authorization
T1557.002Adversary-in-the-Middle: ARP Cache Poisoning

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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