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[USN-7673-1] CRaC JDK 21 vulnerabilities

Posted on 28 July 2025
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-7673-1
July 28, 2025

openjdk-21-crac vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.04

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 contain bug fixes, new
features, and possibly incompatible changes.

Please see the following for more information:
https://openjdk.org/groups/vulnerability/advisories/2025-07-15

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

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

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