SUSE-SU-2026:3216-1
Vulnerability from csaf_suse - Published: 2026-07-23 17:33 - Updated: 2026-07-23 17:33Summary
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-2026-3216,SUSE-SLE-SERVER-12-SP5-LTSS-EXTENDED-SECURITY-2026-3216
Terms of use: CSAF 2.0 data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0).
5.5 (Medium)
Affected products
Recommended
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:avahi-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:avahi-compat-howl-devel-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:avahi-compat-mDNSResponder-devel-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:avahi-lang-0.6.32-32.45.1.noarch | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:avahi-utils-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-client3-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-client3-32bit-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-common3-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-common3-32bit-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-core7-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-devel-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libdns_sd-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
|
| Unresolved product id: SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libdns_sd-32bit-0.6.32-32.45.1.x86_64 | — |
Vendor Fix
|
Threats
Impact
moderate
References
8 references
{
"document": {
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"text": "moderate"
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"category": "csaf_security_advisory",
"csaf_version": "2.0",
"distribution": {
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"tlp": {
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"notes": [
{
"category": "summary",
"text": "Security update for avahi",
"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"
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"title": "Terms of use"
}
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"name": "SUSE Product Security Team",
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"references": [
{
"category": "external",
"summary": "SUSE ratings",
"url": "https://www.suse.com/support/security/rating/"
},
{
"category": "self",
"summary": "URL of this CSAF notice",
"url": "https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_3216-1.json"
},
{
"category": "self",
"summary": "URL for SUSE-SU-2026:3216-1",
"url": "https://www.suse.com/support/update/announcement/2026/suse-su-20263216-1/"
},
{
"category": "self",
"summary": "E-Mail link for SUSE-SU-2026:3216-1",
"url": "https://lists.suse.com/pipermail/sle-updates/2026-July/048674.html"
},
{
"category": "self",
"summary": "SUSE Bug 1255451",
"url": "https://bugzilla.suse.com/1255451"
},
{
"category": "self",
"summary": "SUSE CVE CVE-2025-59529 page",
"url": "https://www.suse.com/security/cve/CVE-2025-59529/"
}
],
"title": "Security update for avahi",
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{
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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.",
"title": "CVE description"
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"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:avahi-compat-howl-devel-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:avahi-compat-mDNSResponder-devel-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:avahi-lang-0.6.32-32.45.1.noarch",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:avahi-utils-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-client3-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-client3-32bit-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-common3-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-common3-32bit-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-core7-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libavahi-devel-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libdns_sd-0.6.32-32.45.1.x86_64",
"SUSE Linux Enterprise Server LTSS Extended Security 12 SP5:libdns_sd-32bit-0.6.32-32.45.1.x86_64"
]
}
],
"threats": [
{
"category": "impact",
"date": "2026-07-23T17:33:10Z",
"details": "moderate"
}
],
"title": "CVE-2025-59529"
}
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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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.
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