Red Hat Fixes RainerScript Denial of Service in RHEL 7 ELS
Tech GuruQuick Answer
Check rsyslog on RHEL 7 Extended Lifecycle Support. Apply RHSA-2026:96085 from the matching entitled repository. Validate the configuration before restarting rsyslog, then confirm local ingestion, remote forwarding, queues and log continuity.
Confirm Scope And Apply The Supported Remediation
What to do now: Record rsyslog packages, RainerScript replace() use, remote log listeners and log-forwarding dependencies. RHEL 7 Extended Lifecycle Support: installations of the rsyslog packages requiring RHSA-2026:96085. Match the full installed RPM, architecture and repository to the vendor product tree; a universal upstream version range is not stated. Apply RHSA-2026:96085 through the entitled Red Hat repositories. The fixed source build is rsyslog-0:8.24.0-57.el7_9.4. Install the matching binary packages for the supported stream and architecture. Validate the configuration before restarting rsyslog, then confirm local ingestion, remote forwarding, queues and log continuity.
Last verified: 2026-11-09 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | RHEL 7 Extended Lifecycle Support; rsyslog |
|---|---|
| Advisory | RHSA-2026:96085 |
| CVE | CVE-2026-78002 |
| Authoritative release date | November 9, 2026 at 02:52:39 UTC, from Red Hat CSAF initial_release_date. |
| Authority revision date | Red Hat records the substantive last-updated version at 2026-11-09T02:52:39+00:00. The CSAF generation timestamp is 2026-11-09T02:53:12+00:00; generation alone is not a material advisory revision. |
| Affected versions | RHEL 7 Extended Lifecycle Support: installations of the rsyslog packages requiring RHSA-2026:96085. Match the full installed RPM, architecture and repository to the vendor product tree; a universal upstream version range is not stated. |
| Fixed version | rsyslog-0:8.24.0-57.el7_9.4 |
| CVSS base score | 7.5 (highest authority-stated CVSS 3.1 base score) |
| CVSS severity | High (CVSS); Important (Red Hat impact) |
| Exploitation status | Red Hat does not state exploitation in this advisory.; no exploitation claim is inferred. |
Authority CVSS by Vulnerability
| CVE-2026-78002 | CVSS 3.1: 7.5 (High) |
|---|
What Changed
Red Hat released RHSA-2026:96085 for RHEL 7 Extended Lifecycle Support, addressing a heap-buffer overflow in the RainerScript replace() function. The update provides the distribution packages listed below; keep the Red Hat release and support channel matched during remediation.
What To Validate Now
- Inventory. Record rsyslog packages, RainerScript replace() use, remote log listeners and log-forwarding dependencies.
- Establish applicability. RHEL 7 Extended Lifecycle Support: installations of the rsyslog packages requiring RHSA-2026:96085. Match the full installed RPM, architecture and repository to the vendor product tree; a universal upstream version range is not stated.
- Remediate. Apply RHSA-2026:96085 through the entitled Red Hat repositories. The fixed source build is rsyslog-0:8.24.0-57.el7_9.4. Install the matching binary packages for the supported stream and architecture.
- Validate. Validate the configuration before restarting rsyslog, then confirm local ingestion, remote forwarding, queues and log continuity.
- Retain evidence. Preserve asset and owner identifiers, the applicability decision, before-and-after versions, change approval, installation output, validation results, and any exception or rollback record.
Operational Cautions
Red Hat recommends limiting log reception to trusted hosts or disabling unused imudp/imtcp listeners. Coordinate firewall or service changes so required audit logging is preserved.
Evidence To Retain
- Exact product, release stream, package or application version, enabled feature, environment, and accountable owner.
- UTC timestamps, authority revision, approved change record, installer or package-manager output, and resulting version.
- Relevant logs and monitoring evidence, test results, exceptions, compensating controls, and rollback decisions.
Related TechGeeks Resources
Authoritative References
Correction policy: If the authority changes affected versions, fixed versions, severity, exploitation information, mitigations, or required action, TechGeeks will update this notice and its verification date.
Advisory facts are attributed to Red Hat Inc. The linked CSAF content is licensed under CC BY 4.0; TechGeeks operational guidance is summarized for this notice.
