==========================================================================
Ubuntu Security Notice USN-8402-1
June 08, 2026

systemd vulnerabilities
==========================================================================

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

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in systemd.

Software Description:
- systemd: system and service manager

Details:

It was discovered that systemd-nspawn incorrectly handled certain optional
configuration files. A local attacker could possibly use this issue to
escape to the host system and execute arbitrary code. (CVE-2026-40226)

It was discovered that systemd-resolved incorrectly validated DNSSEC
records for signed domains. An attacker could possibly use this issue to
manipulate DNS records. This issue only affected Ubuntu 22.04 LTS.
(CVE-2023-7008)

Update instructions:

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

Ubuntu 25.10
  libsystemd0                     257.9-0ubuntu2.5
  libudev1                        257.9-0ubuntu2.5
  systemd                         257.9-0ubuntu2.5
  udev                            257.9-0ubuntu2.5

Ubuntu 24.04 LTS
  libsystemd0                     255.4-1ubuntu8.16
  libudev1                        255.4-1ubuntu8.16
  systemd                         255.4-1ubuntu8.16
  udev                            255.4-1ubuntu8.16

Ubuntu 22.04 LTS
  libnss-resolve                  249.11-0ubuntu3.21
  libsystemd0                     249.11-0ubuntu3.21
  libudev1                        249.11-0ubuntu3.21
  systemd                         249.11-0ubuntu3.21
  udev                            249.11-0ubuntu3.21

After a standard system update you need to reboot your computer to make all
the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-8402-1
  CVE-2023-7008, CVE-2026-40226

Package Information:
  https://launchpad.net/ubuntu/+source/systemd/257.9-0ubuntu2.5
  https://launchpad.net/ubuntu/+source/systemd/255.4-1ubuntu8.16
  https://launchpad.net/ubuntu/+source/systemd/249.11-0ubuntu3.21