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Vulnerability of Ubuntu net-snmp: use after free via usm_free_usmStateReference

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via usm_free_usmStateReference() of Ubuntu net-snmp, in order to trigger a denial of service, and possibly to run code.
Impacted software: BIG-IP Hardware, TMOS, Solaris, Ubuntu.
Severity of this computer vulnerability: 3/4.
Creation date: 03/07/2020.
Références of this announce: bulletinoct2020, CVE-2019-20892, K45212738, USN-4410-1, VIGILANCE-VUL-32698.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via usm_free_usmStateReference() of Ubuntu net-snmp, in order to trigger a denial of service, and possibly to run code.
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This weakness note impacts software or systems such as BIG-IP Hardware, TMOS, Solaris, Ubuntu.

Our Vigil@nce team determined that the severity of this threat note is important.

The trust level is of type confirmed by the editor, with an origin of intranet client.

An attacker with a expert ability can exploit this computer weakness.

Solutions for this threat 

F5 BIG-IP: solution for SNMP.
The solution is indicated in information sources.

Oracle Solaris: patch for third party software of October 2020 v2.
A patch is available:
  https://support.oracle.com/rs?type=doc&id=1448883.1

Ubuntu: new snmpd packages.
New packages are available:
  Ubuntu 20.04 LTS: libsnmp-base 5.8+dfsg-2ubuntu2.1, snmpd 5.8+dfsg-2ubuntu2.1

Wind River Linux: version 10.17.41.22.
The version 10.17.41.22 is fixed:
  https://support2.windriver.com/index.php?page=cve&on=list&show=50&product_id=1&product_version%5B0%5D=2&id_status%5B0%5D=4&cve_id_filter=&s=&submit=&order_by=cve_modified_date&order_way=desc#list
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