net-snmp: Net-SNMP through 5.9.5.2 contains a denial of service vulnerability in the SMUX module where smux_accept() performs a...
CVE-2026-89147 is fixed in 11 products on 1 platform, first by libnetsnmptrapd40 5.9.1+dfsg-1ubuntu2.10, released September 11, 2026. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| libnetsnmptrapd40 · Ubuntu 22.04.1 LTS (jammy) | 5.9.1+dfsg-1ubuntu2.10 | libnetsnmptrapd40 5.9.1+dfsg-1ubuntu2.10 | Sep 11, 2026 |
| libnetsnmptrapd40t64 · Ubuntu 24.04.5 LTS (noble) | 5.9.4+dfsg-1.1ubuntu3.3 | libnetsnmptrapd40t64 5.9.4+dfsg-1.1ubuntu3.3 | Sep 11, 2026 |
| libnetsnmptrapd40t64 · Ubuntu 26.04.1 LTS (resolute) | 5.9.4+dfsg-2ubuntu3.1 | libnetsnmptrapd40t64 5.9.4+dfsg-2ubuntu3.1 | Sep 11, 2026 |
| libsnmp-base · Ubuntu 22.04.1 LTS (jammy) | 5.9.1+dfsg-1ubuntu2.10 | libsnmp-base 5.9.1+dfsg-1ubuntu2.10 | Sep 11, 2026 |
| libsnmp-base · Ubuntu 24.04.5 LTS (noble) | 5.9.4+dfsg-1.1ubuntu3.3 | libsnmp-base 5.9.4+dfsg-1.1ubuntu3.3 | Sep 11, 2026 |
| libsnmp-base · Ubuntu 26.04.1 LTS (resolute) | 5.9.4+dfsg-2ubuntu3.1 | libsnmp-base 5.9.4+dfsg-2ubuntu3.1 | Sep 11, 2026 |
| libsnmp-perl · Ubuntu 22.04.1 LTS (jammy) | 5.9.1+dfsg-1ubuntu2.10 | libsnmp-perl 5.9.1+dfsg-1ubuntu2.10 | Sep 11, 2026 |
| libsnmp-perl · Ubuntu 24.04.5 LTS (noble) | 5.9.4+dfsg-1.1ubuntu3.3 | libsnmp-perl 5.9.4+dfsg-1.1ubuntu3.3 | Sep 11, 2026 |
| libsnmp-perl · Ubuntu 26.04.1 LTS (resolute) | 5.9.4+dfsg-2ubuntu3.1 | libsnmp-perl 5.9.4+dfsg-2ubuntu3.1 | Sep 11, 2026 |
| libsnmp40 · Ubuntu 22.04.1 LTS (jammy) | 5.9.1+dfsg-1ubuntu2.10 | libsnmp40 5.9.1+dfsg-1ubuntu2.10 | Sep 11, 2026 |
| libsnmp40t64 · Ubuntu 24.04.5 LTS (noble) | 5.9.4+dfsg-1.1ubuntu3.3 | libsnmp40t64 5.9.4+dfsg-1.1ubuntu3.3 | Sep 11, 2026 |
| libsnmp40t64 · Ubuntu 26.04.1 LTS (resolute) | 5.9.4+dfsg-2ubuntu3.1 | libsnmp40t64 5.9.4+dfsg-2ubuntu3.1 | Sep 11, 2026 |
| net-snmp · Debian 14 | 5.9.5.2+dfsg-3 | DEBIAN-CVE-2026-89147 | Sep 18, 2026 |
| snmp · Ubuntu 22.04.1 LTS (jammy) | 5.9.1+dfsg-1ubuntu2.10 | snmp 5.9.1+dfsg-1ubuntu2.10 | Sep 11, 2026 |
| snmp · Ubuntu 24.04.5 LTS (noble) | 5.9.4+dfsg-1.1ubuntu3.3 | snmp 5.9.4+dfsg-1.1ubuntu3.3 | Sep 11, 2026 |
| snmp · Ubuntu 26.04.1 LTS (resolute) | 5.9.4+dfsg-2ubuntu3.1 | snmp 5.9.4+dfsg-2ubuntu3.1 | Sep 11, 2026 |
| snmpd · Ubuntu 22.04.1 LTS (jammy) | 5.9.1+dfsg-1ubuntu2.10 | snmpd 5.9.1+dfsg-1ubuntu2.10 | Sep 11, 2026 |
| snmpd · Ubuntu 24.04.5 LTS (noble) | 5.9.4+dfsg-1.1ubuntu3.3 | snmpd 5.9.4+dfsg-1.1ubuntu3.3 | Sep 11, 2026 |
| snmpd · Ubuntu 26.04.1 LTS (resolute) | 5.9.4+dfsg-2ubuntu3.1 | snmpd 5.9.4+dfsg-2ubuntu3.1 | Sep 11, 2026 |
| snmptrapd · Ubuntu 22.04.1 LTS (jammy) | 5.9.1+dfsg-1ubuntu2.10 | snmptrapd 5.9.1+dfsg-1ubuntu2.10 | Sep 11, 2026 |
| snmptrapd · Ubuntu 24.04.5 LTS (noble) | 5.9.4+dfsg-1.1ubuntu3.3 | snmptrapd 5.9.4+dfsg-1.1ubuntu3.3 | Sep 11, 2026 |
| snmptrapd · Ubuntu 26.04.1 LTS (resolute) | 5.9.4+dfsg-2ubuntu3.1 | snmptrapd 5.9.4+dfsg-2ubuntu3.1 | Sep 11, 2026 |
| tkmib · Ubuntu 22.04.1 LTS (jammy) | 5.9.1+dfsg-1ubuntu2.10 | tkmib 5.9.1+dfsg-1ubuntu2.10 | Sep 11, 2026 |
| tkmib · Ubuntu 24.04.5 LTS (noble) | 5.9.4+dfsg-1.1ubuntu3.3 | tkmib 5.9.4+dfsg-1.1ubuntu3.3 | Sep 11, 2026 |
| tkmib · Ubuntu 26.04.1 LTS (resolute) | 5.9.4+dfsg-2ubuntu3.1 | tkmib 5.9.4+dfsg-2ubuntu3.1 | Sep 11, 2026 |
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