USN-7673-1: CRaC JDK 21 vulnerabilities
Publication date
28 July 2025
Overview
Several security issues were fixed in CRaC JDK 21.
Releases
Packages
- 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...
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
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.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 25.04 plucky | 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 | |||
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