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Ubuntu 22.04 LTS ZuluCrypt Critical Local Privilege Escalation USN-8218-1

ubuntu
Calendar Grey April 30, 2026
Dist Ubuntu Esm H88
ZuluCrypt vulnerability allows local privilege escalation in multiple Ubuntu versions. Update recommended to avoid risks.
zuluCrypt could be made to run programs as an administrator.

Summary

zuluCrypt could be made to run programs as an administrator.

Software Description:

- zulucrypt: A simple, feature rich and powerful solution for hard drives encryption

Details:

Aaron Rainbolt discovered that zuluCrypt used insecure PolicyKit

settings in zuluPolkit. An attacker could possibly use this issue to

cause local privilege escalation to root. (CVE-2025-53391)

Topics%20covered

Topics Covered

security advisory critical local privilege escalation Ubuntu policykit zulucrypt

Update Instructions

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

Ubuntu 24.04 LTS
  libzulucrypt-dev                6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  libzulucrypt-exe-dev            6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  libzulucrypt-exe1.2.0           6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  libzulucrypt-plugins            6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  libzulucrypt1.2.0               6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  libzulucryptpluginmanager-dev   6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  libzulucryptpluginmanager1.0.0  6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  zulucrypt-cli                   6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  zulucrypt-gui                   6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  zulumount-cli                   6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  zulumount-gui                   6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  zulupolkit                      6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro
  zulusafe-cli                    6.2.0-1ubuntu3+esm1
                                  Available with Ubuntu Pro

Ubuntu 22.04 LTS
  libzulucrypt-dev                5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucrypt-exe-dev            5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucrypt-exe1.2.0           5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucrypt-plugins            5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucrypt1.2.0               5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucryptpluginmanager-dev   5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucryptpluginmanager1.0.0  5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulucrypt-cli                   5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulucrypt-gui                   5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulumount-cli                   5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulumount-gui                   5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulupolkit                      5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulusafe-cli                    5.7.1-2ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 20.04 LTS
  libzulucrypt-dev                5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucrypt-exe-dev            5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucrypt-exe1.2.0           5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucrypt-plugins            5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucrypt1.2.0               5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucryptpluginmanager-dev   5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  libzulucryptpluginmanager1.0.0  5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulucrypt-cli                   5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulucrypt-gui                   5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulumount-cli                   5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulumount-gui                   5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulupolkit                      5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro
  zulusafe-cli                    5.7.0-1ubuntu0.1~esm1
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  libzulucrypt-dev                5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  libzulucrypt-exe-dev            5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  libzulucrypt-exe1.2.0           5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  libzulucrypt-plugins            5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  libzulucrypt1.2.0               5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  libzulucryptpluginmanager-dev   5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  libzulucryptpluginmanager1.0.0  5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  zulucrypt-cli                   5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  zulucrypt-gui                   5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  zulumount-cli                   5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  zulumount-gui                   5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  zulupolkit                      5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro
  zulusafe-cli                    5.4.0-2ubuntu0.1~esm2
                                  Available with Ubuntu Pro

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

References

https://ubuntu.com/security/notices/USN-8218-1

CVE-2025-53391

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8218-1

Topics%20covered

Topics Covered

security advisory critical local privilege escalation Ubuntu policykit zulucrypt

Package Information

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