[USN-7412-2] GnuPG regression

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==========================================================================

Ubuntu Security Notice USN-7412-2
July 08, 2025

gnupg2 regression
==========================================================================

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

- Ubuntu 25.04
- Ubuntu 24.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

USN-7412-1 introduced a regression in GnuPG.

Software Description:
- gnupg2: GNU privacy guard - a free PGP replacement

Details:

USN-7412-1 fixed vulnerabilities in GnuPG. The update introduced a
regression. This update fixes the problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that GnuPG incorrectly handled importing keys with
 certain crafted subkey data. If a user or automated system were tricked
 into importing a specially crafted key, a remote attacker may prevent
 users from importing other keys in the future.

Update instructions:

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

Ubuntu 25.04
  gnupg                           2.4.4-2ubuntu23.1
  gnupg2                          2.4.4-2ubuntu23.1
  gpg                             2.4.4-2ubuntu23.1

Ubuntu 24.10
  gnupg                           2.4.4-2ubuntu18.3
  gnupg2                          2.4.4-2ubuntu18.3
  gpg                             2.4.4-2ubuntu18.3

Ubuntu 24.04 LTS
  gnupg                           2.4.4-2ubuntu17.3
  gnupg2                          2.4.4-2ubuntu17.3
  gpg                             2.4.4-2ubuntu17.3

Ubuntu 22.04 LTS
  gnupg                           2.2.27-3ubuntu2.4
  gnupg2                          2.2.27-3ubuntu2.4
  gpg                             2.2.27-3ubuntu2.4

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

References:
  https://ubuntu.com/security/notices/USN-7412-2
  https://ubuntu.com/security/notices/USN-7412-1
  https://launchpad.net/bugs/2114775

Package Information:
  https://launchpad.net/ubuntu/+source/gnupg2/2.4.4-2ubuntu23.1
  https://launchpad.net/ubuntu/+source/gnupg2/2.4.4-2ubuntu18.3
  https://launchpad.net/ubuntu/+source/gnupg2/2.4.4-2ubuntu17.3
  https://launchpad.net/ubuntu/+source/gnupg2/2.2.27-3ubuntu2.4