Ubuntu 18.04 LTS vulnerabilities

3 known vulnerabilities in Ubuntu 18.04 LTS from Canonical. 3 are rated high or critical. Each entry lists the affected versions and the release that fixes it, where the vendor has published one.

Latest first

• 8.4 High severity

  Ubuntu 26.04 LTS: Execution with Unnecessary Privileges

  CVE-2026-15226Jul 21, 2026Canonical

  A sandbox confinement bypass vulnerability exists in Canonical snapd within its internal execution environment compiler (snap-confine). The default seccomp security templates generated by the engine to restrict system calls do not filter or reject process oper

• 9.0 Critical severity

  An input validation and injection vulnerability exists in Canonical ubuntu-pro-client…

  CVE-2026-11386Jul 16, 2026Canonical

  An input validation and injection vulnerability exists in Canonical ubuntu-pro-client (formerly ubuntu-advantage-tools). The client constructs APT source files (such as /etc/apt/sources.list.d/ubuntu-.list or their DEB822 equivalents) using data received direc

• 7.8 High severity

  Ubuntu 16.04 LTS: Privilege Chaining

  CVE-2026-3888Mar 17, 2026CanonicalEPSS 1.43%

  Local privilege escalation in snapd on Linux allows local attackers to get root privilege by re-creating snap's private /tmp directory when systemd-tmpfiles is configured to automatically clean up this directory. This issue affects Ubuntu 16.04 LTS, 18.04 LTS,