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Canonical Ubuntu Server 22.04 LTS (Jammy Jellyfish) Update Version 1:8.9p1-3ubuntu0.17

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Update Summary

USN-8721-1 addresses three OpenSSH security issues in Ubuntu Server 22.04 LTS (jammy): CVE-2026-73281, CVE-2026-73282, and CVE-2026-73283. Update openssh-client and openssh-server to the fixed jammy package versions and restart OpenSSH after upgrading.

Update Details

Security

  • ssh-agent could be abused through forwarded agent connections to perform local-only operations such as adding tokens or using keys (CVE-2026-73281).
  • The SSH client could hit a use-after-free during concurrent remote-forwarding operations, causing denial of service or possible arbitrary code execution (CVE-2026-73282).
  • sshd could incorrectly apply the restrict keyword from authorized_keys to tunnel forwarding requests, allowing a local attacker with an authorized key to bypass tunnel forwarding restrictions (CVE-2026-73283).

Hints

  • After a standard system update, restart OpenSSH to apply the changes.
  • For Ubuntu 22.04 LTS jammy, install openssh-client 1:8.9p1-3ubuntu0.17 and openssh-server 1:8.9p1-3ubuntu0.17.

Product Information

Vendor: Canonical

Product: Ubuntu Server

Product type: Software

Application category: Utilities

Platform: Linux

Variant: 22.04 LTS (Jammy Jellyfish)

Version: 1:8.9p1-3ubuntu0.17

Vendor release date: Sep 3, 2026

Original release notes: View on vendor site

Published on updatealert.io: Sep 4, 2026

Description: Server operating system for Linux infrastructure and workloads.

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