UBUNTU-CVE-2026-89147

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    UBUNTU-CVE-2026-89147

    Published: 11 Sept 2026Last Modified: 5 Nov 2026
    Upstream:
    CVE-2026-89147
    Aliases:
    USN-8997-1

    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.

    References: https://ubuntu.com/security/CVE-2026-89147, https://www.cve.org/CVERecord?id=CVE-2026-89147, https://gist.github.com/thesmartshadow/001cea595e75fed6aaea7389666dc9eb, https://github.com/net-snmp/net-snmp, https://github.com/net-snmp/net-snmp/blob/v5.9.5.2/agent/mibgroup/smux/smux.c, https://www.vulncheck.com/advisories/net-snmp-through-5.9.5.2-denial-of-service-via-blocking-unauthenticated-smux-read, https://ubuntu.com/security/notices/USN-8997-1

    Affected packages

    Package

    Name: net-snmp

    Purl: pkg:deb/ubuntu/net-snmp?arch=source&distro=esm-infra-legacy%2Ftrusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -None

    Affected 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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    UBUNTU-CVE-2026-89147 | CVE-DB