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Ubuntu 25.10: Crucial Security Fix for OpenJDK 21 USN-7901-1 CVE-2025-53057

ubuntu
Calendar Grey December 2, 2025
Dist Ubuntu Esm H88
Essential security fix for Ubuntu's openjdk 21 addressing multiple issues including potential data leaks.
Several security issues were fixed in CRaC JDK 21.

Summary

Several security issues were fixed in CRaC JDK 21.

Software Description:

- openjdk-21-crac: Open Source Java implementation with Coordinated Restore at Checkpoints

Details:

Jinfeng Guo discovered that the Security component of CRaC JDK 21 did not

correctly handle certain representations of encoded strings. An

unauthenticated remote attacker could possibly use this issue to modify

files or leak sensitive information. (CVE-2025-53057)

Darius Bohni discovered that the JAXP component of CRaC JDK 21 was

vulnerable to a XML External Entity (XEE) attack. An unauthenticated remote

attacker could possibly use this issue to modify files or leak sensitive

information. (CVE-2025-53066)

Yakov Shafranovich discovered that the Libraries component of CRaC JDK 21

contained an issue where certain Strings built with StringBuilder returned

an incorrect result for String.equals() checks. An unauthenticated remote

attacker could possibly use this issue to update, insert, or delete

accessible data. ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory security issue remote access Ubuntu important openjdk

Update Instructions

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

Ubuntu 25.10
  openjdk-21-crac-jdk             21.0.9+10-0ubuntu1~25.10
  openjdk-21-crac-jdk-headless    21.0.9+10-0ubuntu1~25.10
  openjdk-21-crac-jre             21.0.9+10-0ubuntu1~25.10
  openjdk-21-crac-jre-headless    21.0.9+10-0ubuntu1~25.10
  openjdk-21-crac-jre-zero        21.0.9+10-0ubuntu1~25.10

Ubuntu 25.04
  openjdk-21-crac-jdk             21.0.9+10-0ubuntu1~25.04
  openjdk-21-crac-jdk-headless    21.0.9+10-0ubuntu1~25.04
  openjdk-21-crac-jre             21.0.9+10-0ubuntu1~25.04
  openjdk-21-crac-jre-headless    21.0.9+10-0ubuntu1~25.04
  openjdk-21-crac-jre-zero        21.0.9+10-0ubuntu1~25.04

This update uses a new upstream release, which includes additional bug
fixes. After a standard system update you need to restart Java applications
to make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-7901-1

CVE-2025-53057, CVE-2025-53066, CVE-2025-61748

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7901-1

Topics%20covered

Topics Covered

security advisory security issue remote access Ubuntu important openjdk

Package Information

https://launchpad.net/ubuntu/+source/openjdk-21-crac/21.0.9+10-0ubuntu1~25.10
https://launchpad.net/ubuntu/+source/openjdk-21-crac/21.0.9+10-0ubuntu1~25.04

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