Ubuntu 26.04 ADSys Critical Denial of Service Issues USN-8430-1

ubuntu

June 15, 2026

Several security issues were fixed in ADSys.

Summary

Several security issues were fixed in ADSys.

Software Description:

- adsys: Active Directory Group Policy client

Details:

It was discovered that ADSys did not properly handle certain HTTP/2 frames.

A remote attacker could possibly use this issue to cause a denial of

service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-27141)

It was discovered that ADSys did not properly handle certain HTTP/2

SETTINGS frames. A remote attacker could possibly use this issue to cause a

denial of service. (CVE-2026-33814)

Topics Covered

security advisory denial of service Ubuntu important CVE adsys

Update Instructions

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

Ubuntu 26.04 LTS
  adsys                           0.16.4ubuntu1.1

Ubuntu 25.10
  adsys                           0.16.3ubuntu0.25.10.2

Ubuntu 24.04 LTS
  adsys                           0.16.3~24.04.2ubuntu0.24.04.1

Ubuntu 22.04 LTS
  adsys                           0.16.3~22.04.2ubuntu0.22.04.1

Ubuntu 20.04 LTS
  adsys                           0.9.2~20.04.2ubuntu0.1+esm2
                                  Available with Ubuntu Pro

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