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[USN-9057-1] rkhunter vulnerability

Posted on 12 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-9057-1
November 11, 2026

rkhunter vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

rkhunter could be made to run programs if it received specially crafted
network traffic.

Software Description:
- rkhunter: rootkit, backdoor, sniffer and exploit scanner

Details:

It was discovered that rkhunter downloaded mirror updates over an insecure
channel. A remote attacker could possibly use this issue to execute
arbitrary code.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 LTS
rkhunter 1.4.2-5ubuntu0.1~esm1
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-9057-1
CVE-2017-7480

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