[USN-7849-1] libssh vulnerability

[noreply+usn-bot at canonical.com]

==========================================================================
Ubuntu Security Notice USN-7849-1
November 04, 2025

libssh vulnerability
==========================================================================

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

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

libssh could be made to crash.

Software Description:
- libssh: A tiny C SSH library

Details:

Philippe Antoine discovered that libssh did not properly manage memory
when calculating a session id during the key exchange process. An attacker
could possibly use this issue to cause libssh to crash, resulting in a
denial of service.

Update instructions:

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

Ubuntu 25.10
  libssh-4                        0.11.2-1ubuntu0.1

Ubuntu 25.04
  libssh-4                        0.11.1-1ubuntu0.2

Ubuntu 24.04 LTS
  libssh-4                        0.10.6-2ubuntu0.2
  libssh-gcrypt-4                 0.10.6-2ubuntu0.2

Ubuntu 22.04 LTS
  libssh-4                        0.9.6-2ubuntu0.22.04.5
  libssh-gcrypt-4                 0.9.6-2ubuntu0.22.04.5

Ubuntu 20.04 LTS
  libssh-4                        0.9.3-2ubuntu2.5+esm2
                                  Available with Ubuntu Pro
  libssh-gcrypt-4                 0.9.3-2ubuntu2.5+esm2
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libssh-4                        0.8.0~20170825.94fa1e38-1ubuntu0.7+esm5
                                  Available with Ubuntu Pro
  libssh-gcrypt-4                 0.8.0~20170825.94fa1e38-1ubuntu0.7+esm5
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  libssh-4                        0.6.3-4.3ubuntu0.6+esm3
                                  Available with Ubuntu Pro
  libssh-gcrypt-4                 0.6.3-4.3ubuntu0.6+esm3
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7849-1
  CVE-2025-8114

Package Information:
  https://launchpad.net/ubuntu/+source/libssh/0.11.2-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/libssh/0.11.1-1ubuntu0.2
  https://launchpad.net/ubuntu/+source/libssh/0.10.6-2ubuntu0.2
  https://launchpad.net/ubuntu/+source/libssh/0.9.6-2ubuntu0.22.04.5
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