Red Hat Security Advisory: java-21-ibm-semeru-certified-jdk security update
This Red Hat security advisory addresses multiple vulnerabilities in the IBM Semeru Runtime Certified Edition 21 runtime environment, including a denial of service vulnerability in Eclipse Open9J JITServer via crafted TCP messages (CVE-2026-6918) and several OpenJDK-related issues enhancing cryptographic algorithm support, Kerberos credentialing, certificate validation, key generation, and TLS connection handling. Additionally, a freetype vulnerability allows information disclosure or denial of service via specially crafted font files (CVE-2026-23865). The advisory covers Red Hat Enterprise Linux 10 and its Extended Update Support versions. Red Hat has released updated packages to remediate these issues. No known exploits in the wild have been reported at this time.
AI Analysis
Technical Summary
The advisory covers security fixes for the IBM Semeru Runtime Certified Edition 21 runtime environment distributed with Red Hat Enterprise Linux 10 and related variants. It includes a denial of service vulnerability in Eclipse Open9J JITServer (CVE-2026-6918) triggered by crafted TCP messages. Multiple OpenJDK vulnerabilities addressed improve cryptographic algorithm support (CVE-2026-22007), Kerberos credentialing (CVE-2026-22013), certificate chain validation (CVE-2026-22021), key generation (CVE-2026-34268), TLS connection handling (CVE-2026-34282), and path factories (CVE-2026-22016). A freetype vulnerability (CVE-2026-23865) allows information disclosure or denial of service via crafted font files. Red Hat has issued updated packages for affected versions, and detailed remediation instructions are available in the vendor advisory.
Potential Impact
The vulnerabilities collectively could allow denial of service conditions and information disclosure in affected Red Hat Enterprise Linux systems running the IBM Semeru Runtime Certified Edition 21. The denial of service in Eclipse Open9J JITServer could disrupt Java runtime operations via crafted TCP messages. Cryptographic enhancements address potential weaknesses in algorithm support, Kerberos authentication, certificate validation, key generation, and TLS handling, which could otherwise impact secure communications and authentication. The freetype flaw could lead to information leakage or service disruption via malicious font files. No known active exploitation has been reported.
Mitigation Recommendations
Red Hat has released updated packages for the java-21-ibm-semeru-certified-jdk in Red Hat Enterprise Linux 10 and its Extended Update Support variants to address these vulnerabilities. Users should apply these official updates promptly following Red Hat's published guidance at https://access.redhat.com/articles/11258. Since this is an on-premises product, remediation requires manual update by system administrators. There are no indications that the vulnerabilities are mitigated by default or require no action. No known exploits in the wild have been reported, but timely patching is recommended.
Red Hat Security Advisory: java-21-ibm-semeru-certified-jdk security update
Description
This Red Hat security advisory addresses multiple vulnerabilities in the IBM Semeru Runtime Certified Edition 21 runtime environment, including a denial of service vulnerability in Eclipse Open9J JITServer via crafted TCP messages (CVE-2026-6918) and several OpenJDK-related issues enhancing cryptographic algorithm support, Kerberos credentialing, certificate validation, key generation, and TLS connection handling. Additionally, a freetype vulnerability allows information disclosure or denial of service via specially crafted font files (CVE-2026-23865). The advisory covers Red Hat Enterprise Linux 10 and its Extended Update Support versions. Red Hat has released updated packages to remediate these issues. No known exploits in the wild have been reported at this time.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The advisory covers security fixes for the IBM Semeru Runtime Certified Edition 21 runtime environment distributed with Red Hat Enterprise Linux 10 and related variants. It includes a denial of service vulnerability in Eclipse Open9J JITServer (CVE-2026-6918) triggered by crafted TCP messages. Multiple OpenJDK vulnerabilities addressed improve cryptographic algorithm support (CVE-2026-22007), Kerberos credentialing (CVE-2026-22013), certificate chain validation (CVE-2026-22021), key generation (CVE-2026-34268), TLS connection handling (CVE-2026-34282), and path factories (CVE-2026-22016). A freetype vulnerability (CVE-2026-23865) allows information disclosure or denial of service via crafted font files. Red Hat has issued updated packages for affected versions, and detailed remediation instructions are available in the vendor advisory.
Potential Impact
The vulnerabilities collectively could allow denial of service conditions and information disclosure in affected Red Hat Enterprise Linux systems running the IBM Semeru Runtime Certified Edition 21. The denial of service in Eclipse Open9J JITServer could disrupt Java runtime operations via crafted TCP messages. Cryptographic enhancements address potential weaknesses in algorithm support, Kerberos authentication, certificate validation, key generation, and TLS handling, which could otherwise impact secure communications and authentication. The freetype flaw could lead to information leakage or service disruption via malicious font files. No known active exploitation has been reported.
Mitigation Recommendations
Red Hat has released updated packages for the java-21-ibm-semeru-certified-jdk in Red Hat Enterprise Linux 10 and its Extended Update Support variants to address these vulnerabilities. Users should apply these official updates promptly following Red Hat's published guidance at https://access.redhat.com/articles/11258. Since this is an on-premises product, remediation requires manual update by system administrators. There are no indications that the vulnerabilities are mitigated by default or require no action. No known exploits in the wild have been reported, but timely patching is recommended.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:22328
- Cve Count
- 8
- Additional Cves
- ["CVE-2026-22007","CVE-2026-22013","CVE-2026-22016","CVE-2026-22021","CVE-2026-23865","CVE-2026-34268","CVE-2026-34282"]
- Cvss Version
- null
Threat ID: 6a1f4e85e29bf47b5007d99d
Added to database: 6/2/2026, 9:43:33 PM
Last enriched: 6/2/2026, 9:48:03 PM
Last updated: 6/3/2026, 4:49:54 AM
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.