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Ubuntu 20.04 LTS USN-8089-3 ADSys Juju Core LXD Important DoS

Several security issues were fixed in ADSys, Juju Core, LXD. ========================================================================== Ubuntu Security Notice USN-8089-3 April 07, 2026 adsys, juju-core, lxd vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS - Ubuntu 16.04 LTS Summary: Several security issues were fixed in ADSys, Juju Core, LXD Software Description: - adsys: Active Directory Group Policy client - lxd: Container hypervisor based on LXC - juju-core: Application orchestration engine Details: USN-8089-1 fixed vulnerabilities in Go Networking. This update provides the corresponding update to code vendored in LXD, ADSys, and Juju Core. Original advisory details: Bahruz Jabiyev, Tommaso Innocenti, Anthony Gavazzi, Steven Sprecher, and Kaan Onarlioglu discovered that servers using Go Networking could hang during shutdown if preempted by a fatal error. An attacker could possibly use this to cause a denial of service. This issue only affected Ubuntu 22.04 LTS. (CVE-2022-27664) Arpad Ryszka and Jakob Ackermann discovered that a maliciously crafted stream could cause excessive CPU usage in Go Networking's HPACK decoder. An attacker could possibly use this to cause a denial of service. This issue only affected Ubuntu 22.04 LTS. (CVE-2022-41723) Mohammad Thoriq Aziz discovered that Go Networking did not properly sanitize some text nodes. An attacker could possibly use this to execute arbitrary code. This issue only affected Ubuntu 22.04 LTS. (CVE-2023-3978) Sean Ng discovered an error in Go Networking's HTML tag handling. An attacker could possibly use this to cause a denial of service. (CVE-2025-22872) Guido Vranken and Jakub Ciolek discovered that a maliciously crafted HTML document could exhaust system resources on servers using Go Networking. An attacker could possibly use this to cause a denial of service. (CVE-2025-47911) Guido Vranken discovered that a maliciously crafted HTML document could put servers using Go Networking into an infinite loop. An attacker could possibly use this to cause a denial of service. (CVE-2025-58190) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS adsys 0.9.2~20.04.2ubuntu0.1+esm1 Available with Ubuntu Pro adsys-windows 0.9.2~20.04.2ubuntu0.1+esm1 Available with Ubuntu Pro Ubuntu 18.04 LTS lxd 3.0.3-0ubuntu1~18.04.2+esm2 Available with Ubuntu Pro lxd-client 3.0.3-0ubuntu1~18.04.2+esm2 Available with Ubuntu Pro lxd-tools 3.0.3-0ubuntu1~18.04.2+esm2 Available with Ubuntu Pro Ubuntu 16.04 LTS golang-github-lxc-lxd-dev 2.0.11-0ubuntu1~16.04.4+esm2 Available with Ubuntu Pro juju 2.3.7-0ubuntu0.16.04.1+esm2 Available with Ubuntu Pro juju-2.0 2.3.7-0ubuntu0.16.04.1+esm2 Available with Ubuntu Pro lxc2 2.0.11-0ubuntu1~16.04.4+esm2 Available with Ubuntu Pro lxd 2.0.11-0ubuntu1~16.04.4+esm2 Available with Ubuntu Pro lxd-client 2.0.11-0ubuntu1~16.04.4+esm2 Available with Ubuntu Pro lxd-tools 2.0.11-0ubuntu1~16.04.4+esm2 Available with Ubuntu Pro In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8089-3 https://ubuntu.com/security/notices/USN-8089-2 https://ubuntu.com/security/notices/USN-8089-1 CVE-2021-33194, CVE-2022-27664, CVE-2022-41723, CVE-2023-3978, CVE-2025-22872, CVE-2025-47911, CVE-2025-58190 . Several security issues in ADSys, Juju Core, and LXD for Ubuntu were identified and must be patched immediately to prevent risks.. Ubuntu Security, ADSys Issues, Juju Core Update, LXD Vulnerabilities. . Severity: Important. LinuxSecurity.com Team

Apr 07, 2026 •Important Ubuntu