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Ubuntu 16.04 libapache-mod-jk Important Fix for DoS Issue USN-8369-2

ubuntu
Calendar Grey July 23, 2026
Scroller Ubuntu
This advisory outlines a regression issue in libapache-mod-jk affecting Ubuntu 16.04 LTS and its security implications.
Ubuntu issued a security notice regarding a regression in libapache-mod-jk affecting version 16.04 LTS, reintroducing a fix for CVE-2023-41081 due to a previous update error.

Summary

USN-8369-1 introduced a regression in mod_jk

Software Description:

- libapache-mod-jk: Apache 2 connector for the Tomcat Java servlet engine

Details:

USN-8369-1 fixed a vulnerability in mod_jk. It was discovered that for

Ubuntu 18.04 LTS, during the update preparation phase, a previous fix for

CVE-2023-41081 was incorrectly dropped. This update reintroduces the fix

for CVE-2023-41081.

We apologize for the inconvenience.

Original advisory details:

It was discovered that Apache Tomcat Connectors used incorrect default

permissions for shared memory on Unix-like systems. A local attacker could

possibly use this issue to view or modify mod_jk configuration data in

shared memory, resulting in sensitive information exposure or a denial of

service.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu information exposure mod_jk

Update Instructions

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

Ubuntu 16.04 LTS
  libapache2-mod-jk               1:1.2.41-1ubuntu0.1~esm2
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8369-2

https://ubuntu.com/security/notices/USN-8369-1

CVE-2023-41081, https://launchpad.net/bugs/2161580

Severity
critical
Lowest
Low
Medium
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Critical

Ubuntu Security Notice USN-8369-2

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu information exposure mod_jk

Package Information

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