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Ubuntu 25.04: CRaC JDK 21 Critical DoS and Info Disclosure USN-7673-1

ubuntu
Calendar Grey July 28, 2025
Dist Ubuntu Esm H88
Ubuntu 25.04 patch: Several vulnerabilities addressed in CRaC JDK 21, comprising Denial of Service and data leakage risks.
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:

It was discovered that the 2D component of CRaC JDK 21 did not properly

manage memory under certain circumstances. An attacker could possibly

use this issue to cause a denial of service or execute arbitrary code.

(CVE-2025-30749, CVE-2025-50106)

VMashroor Hasan Bhuiyan discovered that the JSSE component of CRaC JDK 21

did not properly manage TLS 1.3 handshakes under certain circumstances.

An attacker could possibly use this issue to obtain sensitive

information. (CVE-2025-30754)

Martin van Wingerden and Violeta Georgieva of Broadcom discovered

that the Networking component of CRaC JDK 21 did not properly

manage network connections under certain circumstances. An attacker

could possibly use this issue to obtain sensitive information.

(CVE-2025-50059)

In addition to security fixes, the updated packages conta...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu arbitrary code openjdk

Update Instructions

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

Ubuntu 25.04
  openjdk-21-crac-jdk             21.0.8+9-0ubuntu2~25.04
  openjdk-21-crac-jdk-headless    21.0.8+9-0ubuntu2~25.04
  openjdk-21-crac-jre             21.0.8+9-0ubuntu2~25.04
  openjdk-21-crac-jre-headless    21.0.8+9-0ubuntu2~25.04
  openjdk-21-crac-jre-zero        21.0.8+9-0ubuntu2~25.04

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-7673-1

CVE-2025-30749, CVE-2025-30754, CVE-2025-50059, CVE-2025-50106

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7673-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu arbitrary code openjdk

Package Information

https://launchpad.net/ubuntu/+source/openjdk-21-crac/21.0.8+9-0ubuntu2~25.04

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