Critical OpenJDK 24 Security Vulnerabilities: Patch Guide for Ubuntu Systems (2025 Update)

Urgent security update for OpenJDK 24 users: Learn about critical vulnerabilities (CVE-2025-21587, CVE-2025-30691, CVE-2025-30698) affecting Java implementations on Ubuntu 24.10/25.04, patch instructions, and how Ubuntu Pro extends protection for enterprise environments.

Severe Security Risks in OpenJDK 24 Implementation

The OpenJDK 24 Java Runtime Environment contains multiple critical vulnerabilities that could compromise system security across Ubuntu distributions. 

These flaws affect core components including JSSE, the Compiler, and 2D graphics rendering - putting enterprise applications, web services, and development environments at risk.

Vulnerability Breakdown

1. RSA Padding Exploit (CVE-2025-21587)

   • Component: JSSE (Java Secure Socket Extension)

   • Risk: Sensitive data exposure through improper cryptographic handling

   • CVSS Score: Estimated 8.1 (High Severity)

2. Compiler Transformation Flaw (CVE-2025-30691)

   • Component: JIT Compiler

   • Risk: Arbitrary code execution or system crashes

   • Attack Vector: Malicious bytecode processing

3. 2D Memory Management Vulnerability (CVE-2025-30698)

   • Component: Java 2D Graphics

   • Risk: Denial-of-service or privilege escalation

   • Impact: Affects all GUI applications and image processing

Immediate Patching Requirements

Affected Ubuntu Versions:

• Ubuntu 25.04 (Noble Numbat)

• Ubuntu 24.10 (Oracular Oriole)

Required Package Updates:

Package	Version (25.04)	Version (24.10)
openjdk-24-jdk	24.0.1+9~us1-0ubuntu1~25.04	24.0.1+9~us1-0ubuntu1~24.10
openjdk-24-jre	24.0.1+9~us1-0ubuntu1~25.04	24.0.1+9~us1-0ubuntu1~24.10
openjdk-24-jre-headless	24.0.1+9~us1-0ubuntu1~25.04	24.0.1+9~us1-0ubuntu1~24.10

Post-Update Actions:
All Java applications must be restarted after patching to implement security fixes.

Enterprise Protection with Ubuntu Pro

For organizations requiring extended security coverage:

• 10-year security maintenance for 25,000+ packages

• Free for up to 5 machines (ideal for developers and SMBs)

• Compliance-ready patching for regulated environments

Learn about Ubuntu Pro security benefits

Additional Security Recommendations

1. Runtime Protection: Implement Java Security Manager policies

2. Network Controls: Restrict JNDI lookup capabilities

3. Monitoring: Audit logs for suspicious JVM activity

Reference Links:

• OpenJDK Vulnerability Advisory

• Ubuntu Security Notice USN-7484-1