CVE-2025-52889Public exploit

Bridge-network interruption via misordered nftables accept rules

Published Jun 25, 2025 · Updated Jun 25, 2025

Resource exhaustion in Linux Containers Incus 6.12 through 6.13 allows guest OS users to interrupt bridge networking via DHCP requests. The nftables bridge-input template places DHCP, DNS, and router-solicitation accept rules before MAC, IPv4, and IPv6 antispoofing drops, so forged source addresses bypass filtering. A user controlling an instance NIC on an ACL-enabled managed bridge can cycle spoofed MAC addresses until the dnsmasq lease pool is exhausted, preventing other instances from obtaining leases.

CVSS severity3.4
Low
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in Linux Containers Incus 6.12 through 6.13 allows guest OS users to interrupt bridge networking via DHCP requests. The nftables bridge-input template places DHCP, DNS, and router-solicitation accept rules before MAC, IPv4, and IPv6 antispoofing drops, so forged source addresses bypass filtering. A user controlling an instance NIC on an ACL-enabled managed bridge can cycle spoofed MAC addresses until the dnsmasq lease pool is exhausted, preventing other instances from obtaining leases.

The record

CVE
CVE-2025-52889
Published
Jun 25, 2025
Updated
Jun 25, 2025
Vendor
Linux Containers
Product
Incus
Classifications
CWE-770, T1498
Attack vector
adjacent
Privileges
admin

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 privilegesadmin

What is affected?

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

Published CVSS scores

3.4GitHub, Inc.CVSS:3.1/AV:A/AC:L/PR:H/UI:N/S:C/C:N/I:N/A:L

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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesadmin
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1498Network Denial of Service

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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