==========================================================================
Ubuntu Security Notice USN-7577-2
June 18, 2025

libblockdev vulnerability
==========================================================================

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

libblockdev could be made to run programs as an administrator.

Software Description:
- libblockdev: libblockdev introspection data

Details:

USN-7577-1 fixed a vulnerability in libblockdev. This update provides
the corresponding update for Ubuntu 18.04 LTS and Ubuntu 20.04 LTS.

Original advisory details:

 It was discovered that libblockdev incorrectly handled mount options when
 resizing certain filesystems. A local attacker with an active session on
 the console can use this issue to escalate their privileges to root.

Update instructions:

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

Ubuntu 20.04 LTS
  libblockdev2                    2.23-2ubuntu3+esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libblockdev2                    2.16-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7577-2
  https://ubuntu.com/security/notices/USN-7577-1
  CVE-2025-6019