Vulnerability-Lookup

SUSE-SU-2026:23161-1

Vulnerability from csaf_suse - Published: 2026-08-04 11:08 - Updated: 2026-09-16 20:12

Summary

Security update for avahi

Severity

Moderate

Notes

Title of the patch: Security update for avahi

Description of the patch: This update for avahi fixes the following issue - CVE-2025-59529: local DoS due to simple protocol server ignoring client limit CLIENTS_MAX (bsc#1255451).

Patchnames: SUSE-SLE-Micro-6.1-650

CVE-2025-59529

5.5 (Medium)


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

Affected products

Recommended 16 products

Product	Version	Remediation
Unresolved product id: SUSE Linux Micro 6.1:avahi-0.8-slfo.1.1_8.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:avahi-0.8-slfo.1.1_8.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:avahi-0.8-slfo.1.1_8.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:avahi-0.8-slfo.1.1_8.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-client3-0.8-slfo.1.1_8.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-client3-0.8-slfo.1.1_8.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-client3-0.8-slfo.1.1_8.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-client3-0.8-slfo.1.1_8.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-common3-0.8-slfo.1.1_8.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-common3-0.8-slfo.1.1_8.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-common3-0.8-slfo.1.1_8.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-common3-0.8-slfo.1.1_8.1.x86_64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-core7-0.8-slfo.1.1_8.1.aarch64	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-core7-0.8-slfo.1.1_8.1.ppc64le	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-core7-0.8-slfo.1.1_8.1.s390x	—	Vendor Fix
Unresolved product id: SUSE Linux Micro 6.1:libavahi-core7-0.8-slfo.1.1_8.1.x86_64	—	Vendor Fix

Threats

Impact moderate

References

8 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/s…	self
https://www.suse.com/support/update/announcement/…	self
https://lists.suse.com/pipermail/sle-security-upd…	self
https://bugzilla.suse.com/1255451	self
https://www.suse.com/security/cve/CVE-2025-59529/	self
https://www.suse.com/security/cve/CVE-2025-59529	external
https://bugzilla.suse.com/1255451	external

JSON

To clipboard

{
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      "text": "moderate"
    },
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
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      "tlp": {
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      }
    },
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    "notes": [
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        "title": "Title of the patch"
      },
      {
        "category": "description",
        "text": "This update for avahi fixes the following issue\n\n- CVE-2025-59529: local DoS due to simple protocol server ignoring client limit CLIENTS_MAX (bsc#1255451).\n",
        "title": "Description of the patch"
      },
      {
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        "title": "Patchnames"
      },
      {
        "category": "legal_disclaimer",
        "text": "CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).",
        "title": "Terms of use"
      }
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      },
      {
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      },
      {
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      },
      {
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      },
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      },
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      }
    ],
    "title": "Security update for avahi",
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          "text": "Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions up to and including 0.9-rc2, the simple protocol server ignores the documented client limit and accepts unlimited connections, allowing for easy local DoS. Although `CLIENTS_MAX` is defined, `server_work()` unconditionally `accept()`s and `client_new()` always appends the new client and increments `n_clients`. There is no check against the limit. When client cannot be accepted as a result of maximal socket number of avahi-daemon, it logs unconditionally error per each connection. Unprivileged local users can exhaust daemon memory and file descriptors, causing a denial of service system-wide for mDNS/DNS-SD. Exhausting local file descriptors causes increased system load caused by logging errors of each of request. Overloading prevents glibc calls using nss-mdns plugins to resolve `*.local.` names and link-local addresses. As of time of publication, no known patched versions are available, but a candidate fix is available in pull request 808, and some workarounds are available. Simple clients are offered for nss-mdns package functionality. It is not possible to disable the unix socket `/run/avahi-daemon/socket`, but resolution requests received via DBus are not affected directly. Tools avahi-resolve, avahi-resolve-address and avahi-resolve-host-name are not affected, they use DBus interface. It is possible to change permissions of unix socket after avahi-daemon is started. But avahi-daemon does not provide any configuration for it. Additional access restrictions like SELinux can also prevent unwanted tools to access the socket and keep resolution working for trusted users.",
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      "threats": [
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          "date": "2026-08-04T11:08:29Z",
          "details": "moderate"
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      "title": "CVE-2025-59529"
    }
  ]
}

CVE-2025-59529 (GCVE-0-2025-59529)

Vulnerability from cvelistv5 – Published: 2025-12-18 20:25 – Updated: 2025-12-19 22:04

Title

simple protocol server ignores accepts unlimited connections and logs failures without limit

Summary

Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions up to and including 0.9-rc2, the simple protocol server ignores the documented client limit and accepts unlimited connections, allowing for easy local DoS. Although `CLIENTS_MAX` is defined, `server_work()` unconditionally `accept()`s and `client_new()` always appends the new client and increments `n_clients`. There is no check against the limit. When client cannot be accepted as a result of maximal socket number of avahi-daemon, it logs unconditionally error per each connection. Unprivileged local users can exhaust daemon memory and file descriptors, causing a denial of service system-wide for mDNS/DNS-SD. Exhausting local file descriptors causes increased system load caused by logging errors of each of request. Overloading prevents glibc calls using nss-mdns plugins to resolve `*.local.` names and link-local addresses. As of time of publication, no known patched versions are available, but a candidate fix is available in pull request 808, and some workarounds are available. Simple clients are offered for nss-mdns package functionality. It is not possible to disable the unix socket `/run/avahi-daemon/socket`, but resolution requests received via DBus are not affected directly. Tools avahi-resolve, avahi-resolve-address and avahi-resolve-host-name are not affected, they use DBus interface. It is possible to change permissions of unix socket after avahi-daemon is started. But avahi-daemon does not provide any configuration for it. Additional access restrictions like SELinux can also prevent unwanted tools to access the socket and keep resolution working for trusted users.

Severity

5.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-12-18 20:41 UTC

CWE

CWE-400 - Uncontrolled Resource Consumption

Assigner

GitHub_M mitre root

References

4 references

URL	Tags
https://github.com/avahi/avahi/security/advisorie…	x_refsource_CONFIRM
https://github.com/avahi/avahi/pull/808	x_refsource_MISC
https://zeropath.com/blog/avahi-simple-protocol-s…	x_refsource_MISC
http://www.openwall.com/lists/oss-security/2025/12/19/1

Impacted products

1 product

Vendor	Product	Version
avahi	avahi	Affected: <= 0.9-rc2

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.