ubuntu-cve-2026-89147
Vulnerability from osv_ubuntu
Published
2026-09-14 00:00
Modified
2026-09-14 00:00
Summary
Details
Net-SNMP through 5.9.5.2 contains a denial of service vulnerability in the SMUX module where smux_accept() performs an unauthenticated blocking read without timeout on newly accepted connections. An unauthenticated remote client can connect to the SMUX listener and send no data, causing the single-threaded snmpd main loop to block indefinitely and suspend all SNMP processing.
Severity
7.5 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libsnmp-base",
"binary_version": "5.7.2~dfsg-8.1ubuntu3.3+esm4"
},
{
"binary_name": "libsnmp-perl",
"binary_version": "5.7.2~dfsg-8.1ubuntu3.3+esm4"
},
{
"binary_name": "libsnmp30",
"binary_version": "5.7.2~dfsg-8.1ubuntu3.3+esm4"
},
{
"binary_name": "python-netsnmp",
"binary_version": "5.7.2~dfsg-8.1ubuntu3.3+esm4"
},
{
"binary_name": "snmp",
"binary_version": "5.7.2~dfsg-8.1ubuntu3.3+esm4"
},
{
"binary_name": "snmpd",
"binary_version": "5.7.2~dfsg-8.1ubuntu3.3+esm4"
},
{
"binary_name": "tkmib",
"binary_version": "5.7.2~dfsg-8.1ubuntu3.3+esm4"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "net-snmp",
"purl": "pkg:deb/ubuntu/net-snmp@5.7.2~dfsg-8.1ubuntu3.3+esm4?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.7.2~dfsg-8ubuntu1",
"5.7.2~dfsg-8ubuntu2",
"5.7.2~dfsg-8.1ubuntu1",
"5.7.2~dfsg-8.1ubuntu2",
"5.7.2~dfsg-8.1ubuntu3",
"5.7.2~dfsg-8.1ubuntu3.1",
"5.7.2~dfsg-8.1ubuntu3.2",
"5.7.2~dfsg-8.1ubuntu3.3",
"5.7.2~dfsg-8.1ubuntu3.3+esm1",
"5.7.2~dfsg-8.1ubuntu3.3+esm2",
"5.7.2~dfsg-8.1ubuntu3.3+esm3",
"5.7.2~dfsg-8.1ubuntu3.3+esm4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libsnmp-base",
"binary_version": "5.7.3+dfsg-1ubuntu4.6+esm2"
},
{
"binary_name": "libsnmp-perl",
"binary_version": "5.7.3+dfsg-1ubuntu4.6+esm2"
},
{
"binary_name": "libsnmp30",
"binary_version": "5.7.3+dfsg-1ubuntu4.6+esm2"
},
{
"binary_name": "python-netsnmp",
"binary_version": "5.7.3+dfsg-1ubuntu4.6+esm2"
},
{
"binary_name": "snmp",
"binary_version": "5.7.3+dfsg-1ubuntu4.6+esm2"
},
{
"binary_name": "snmpd",
"binary_version": "5.7.3+dfsg-1ubuntu4.6+esm2"
},
{
"binary_name": "snmptrapd",
"binary_version": "5.7.3+dfsg-1ubuntu4.6+esm2"
},
{
"binary_name": "tkmib",
"binary_version": "5.7.3+dfsg-1ubuntu4.6+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "net-snmp",
"purl": "pkg:deb/ubuntu/net-snmp@5.7.3+dfsg-1ubuntu4.6+esm2?arch=source\u0026distro=esm-infra/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.7.3+dfsg-1ubuntu2",
"5.7.3+dfsg-1ubuntu3",
"5.7.3+dfsg-1ubuntu4",
"5.7.3+dfsg-1ubuntu4.1",
"5.7.3+dfsg-1ubuntu4.2",
"5.7.3+dfsg-1ubuntu4.3",
"5.7.3+dfsg-1ubuntu4.4",
"5.7.3+dfsg-1ubuntu4.5",
"5.7.3+dfsg-1ubuntu4.6",
"5.7.3+dfsg-1ubuntu4.6+esm1",
"5.7.3+dfsg-1ubuntu4.6+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libsnmp-base",
"binary_version": "5.7.3+dfsg-1.8ubuntu3.8+esm1"
},
{
"binary_name": "libsnmp-perl",
"binary_version": "5.7.3+dfsg-1.8ubuntu3.8+esm1"
},
{
"binary_name": "libsnmp30",
"binary_version": "5.7.3+dfsg-1.8ubuntu3.8+esm1"
},
{
"binary_name": "python-netsnmp",
"binary_version": "5.7.3+dfsg-1.8ubuntu3.8+esm1"
},
{
"binary_name": "snmp",
"binary_version": "5.7.3+dfsg-1.8ubuntu3.8+esm1"
},
{
"binary_name": "snmpd",
"binary_version": "5.7.3+dfsg-1.8ubuntu3.8+esm1"
},
{
"binary_name": "snmptrapd",
"binary_version": "5.7.3+dfsg-1.8ubuntu3.8+esm1"
},
{
"binary_name": "tkmib",
"binary_version": "5.7.3+dfsg-1.8ubuntu3.8+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "net-snmp",
"purl": "pkg:deb/ubuntu/net-snmp@5.7.3+dfsg-1.8ubuntu3.8+esm1?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.7.3+dfsg-1.7ubuntu1",
"5.7.3+dfsg-1.8ubuntu1",
"5.7.3+dfsg-1.8ubuntu2",
"5.7.3+dfsg-1.8ubuntu3",
"5.7.3+dfsg-1.8ubuntu3.1",
"5.7.3+dfsg-1.8ubuntu3.2",
"5.7.3+dfsg-1.8ubuntu3.3",
"5.7.3+dfsg-1.8ubuntu3.5",
"5.7.3+dfsg-1.8ubuntu3.6",
"5.7.3+dfsg-1.8ubuntu3.7",
"5.7.3+dfsg-1.8ubuntu3.8",
"5.7.3+dfsg-1.8ubuntu3.8+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libsnmp-base",
"binary_version": "5.8+dfsg-2ubuntu2.9+esm2"
},
{
"binary_name": "libsnmp-perl",
"binary_version": "5.8+dfsg-2ubuntu2.9+esm2"
},
{
"binary_name": "libsnmp35",
"binary_version": "5.8+dfsg-2ubuntu2.9+esm2"
},
{
"binary_name": "snmp",
"binary_version": "5.8+dfsg-2ubuntu2.9+esm2"
},
{
"binary_name": "snmpd",
"binary_version": "5.8+dfsg-2ubuntu2.9+esm2"
},
{
"binary_name": "snmptrapd",
"binary_version": "5.8+dfsg-2ubuntu2.9+esm2"
},
{
"binary_name": "tkmib",
"binary_version": "5.8+dfsg-2ubuntu2.9+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "net-snmp",
"purl": "pkg:deb/ubuntu/net-snmp@5.8+dfsg-2ubuntu2.9+esm2?arch=source\u0026distro=esm-infra/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.7.3+dfsg-5ubuntu5",
"5.7.3+dfsg-5ubuntu6",
"5.8+dfsg-2ubuntu1",
"5.8+dfsg-2ubuntu2",
"5.8+dfsg-2ubuntu2.1",
"5.8+dfsg-2ubuntu2.2",
"5.8+dfsg-2ubuntu2.3",
"5.8+dfsg-2ubuntu2.4",
"5.8+dfsg-2ubuntu2.5",
"5.8+dfsg-2ubuntu2.6",
"5.8+dfsg-2ubuntu2.7",
"5.8+dfsg-2ubuntu2.9",
"5.8+dfsg-2ubuntu2.9+esm1",
"5.8+dfsg-2ubuntu2.9+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetsnmptrapd40",
"binary_version": "5.9.1+dfsg-1ubuntu2.9"
},
{
"binary_name": "libsnmp-base",
"binary_version": "5.9.1+dfsg-1ubuntu2.9"
},
{
"binary_name": "libsnmp-perl",
"binary_version": "5.9.1+dfsg-1ubuntu2.9"
},
{
"binary_name": "libsnmp40",
"binary_version": "5.9.1+dfsg-1ubuntu2.9"
},
{
"binary_name": "snmp",
"binary_version": "5.9.1+dfsg-1ubuntu2.9"
},
{
"binary_name": "snmpd",
"binary_version": "5.9.1+dfsg-1ubuntu2.9"
},
{
"binary_name": "snmptrapd",
"binary_version": "5.9.1+dfsg-1ubuntu2.9"
},
{
"binary_name": "tkmib",
"binary_version": "5.9.1+dfsg-1ubuntu2.9"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "net-snmp",
"purl": "pkg:deb/ubuntu/net-snmp@5.9.1+dfsg-1ubuntu2.9?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.9+dfsg-3ubuntu2",
"5.9+dfsg-3ubuntu3",
"5.9+dfsg-3ubuntu4",
"5.9.1+dfsg-1ubuntu1",
"5.9.1+dfsg-1ubuntu2",
"5.9.1+dfsg-1ubuntu2.1",
"5.9.1+dfsg-1ubuntu2.2",
"5.9.1+dfsg-1ubuntu2.4",
"5.9.1+dfsg-1ubuntu2.5",
"5.9.1+dfsg-1ubuntu2.6",
"5.9.1+dfsg-1ubuntu2.7",
"5.9.1+dfsg-1ubuntu2.8",
"5.9.1+dfsg-1ubuntu2.9"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetsnmptrapd40t64",
"binary_version": "5.9.4+dfsg-1.1ubuntu3.2"
},
{
"binary_name": "libsnmp-base",
"binary_version": "5.9.4+dfsg-1.1ubuntu3.2"
},
{
"binary_name": "libsnmp-perl",
"binary_version": "5.9.4+dfsg-1.1ubuntu3.2"
},
{
"binary_name": "libsnmp40t64",
"binary_version": "5.9.4+dfsg-1.1ubuntu3.2"
},
{
"binary_name": "snmp",
"binary_version": "5.9.4+dfsg-1.1ubuntu3.2"
},
{
"binary_name": "snmpd",
"binary_version": "5.9.4+dfsg-1.1ubuntu3.2"
},
{
"binary_name": "snmptrapd",
"binary_version": "5.9.4+dfsg-1.1ubuntu3.2"
},
{
"binary_name": "tkmib",
"binary_version": "5.9.4+dfsg-1.1ubuntu3.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "net-snmp",
"purl": "pkg:deb/ubuntu/net-snmp@5.9.4+dfsg-1.1ubuntu3.2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.9.3+dfsg-2ubuntu3",
"5.9.4+dfsg-1ubuntu1",
"5.9.4+dfsg-1ubuntu2",
"5.9.4+dfsg-1.1ubuntu2",
"5.9.4+dfsg-1.1ubuntu3",
"5.9.4+dfsg-1.1ubuntu3.1",
"5.9.4+dfsg-1.1ubuntu3.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libnetsnmptrapd40t64",
"binary_version": "5.9.4+dfsg-2ubuntu3"
},
{
"binary_name": "libsnmp-base",
"binary_version": "5.9.4+dfsg-2ubuntu3"
},
{
"binary_name": "libsnmp-perl",
"binary_version": "5.9.4+dfsg-2ubuntu3"
},
{
"binary_name": "libsnmp40t64",
"binary_version": "5.9.4+dfsg-2ubuntu3"
},
{
"binary_name": "snmp",
"binary_version": "5.9.4+dfsg-2ubuntu3"
},
{
"binary_name": "snmpd",
"binary_version": "5.9.4+dfsg-2ubuntu3"
},
{
"binary_name": "snmptrapd",
"binary_version": "5.9.4+dfsg-2ubuntu3"
},
{
"binary_name": "tkmib",
"binary_version": "5.9.4+dfsg-2ubuntu3"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "net-snmp",
"purl": "pkg:deb/ubuntu/net-snmp@5.9.4+dfsg-2ubuntu3?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"5.9.4+dfsg-2ubuntu2",
"5.9.4+dfsg-2ubuntu3"
]
}
],
"aliases": [],
"details": "Net-SNMP through 5.9.5.2 contains a denial of service vulnerability in the SMUX module where smux_accept() performs an unauthenticated blocking read without timeout on newly accepted connections. An unauthenticated remote client can connect to the SMUX listener and send no data, causing the single-threaded snmpd main loop to block indefinitely and suspend all SNMP processing.",
"id": "UBUNTU-CVE-2026-89147",
"modified": "2026-09-14T00:00:00Z",
"published": "2026-09-14T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-89147"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-89147"
},
{
"type": "REPORT",
"url": "https://gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9eb"
},
{
"type": "REPORT",
"url": "https://github.com/net-snmp/net-snmp"
},
{
"type": "REPORT",
"url": "https://github.com/net-snmp/net-snmp/blob/v5.9.5.2/agent/mibgroup/smux/smux.c"
},
{
"type": "REPORT",
"url": "https://www.vulncheck.com/advisories/net-snmp-through-5.9.5.2-denial-of-service-via-blocking-unauthenticated-smux-read"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
},
{
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-89147"
]
}
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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.
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.
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.
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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.
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