Red Hat RHEL 8.4 AUS and EUS Kernel Update Fixes Two Vulnerabilities
Tech GuruQuick Answer
The authority published RHSA-2026:79778 for RHEL 8.4 Advanced Mission Critical Update Support and RHEL 8.4 EUS Long Life kernel packages. Red Hat published an Important kernel security update with branch-specific fixed packages for the listed vulnerabilities. Affected deployments should be matched to the authority's exact scope and moved to the supported fixed release.
Confirm Scope And Apply The Supported Fix
What to do now: Inventory RHEL 8.4 Advanced Mission Critical Update Support and RHEL 8.4 EUS Long Life kernel packages, match the exact affected release or feature, apply the authority-supported fixed build or service remediation, validate the dependent workflow, and preserve evidence.
Last verified: 2026-10-09 UTC. Recheck the authoritative advisory and supported distribution channel before changing production.
Scope And Authority
| Product scope | RHEL 8.4 Advanced Mission Critical Update Support and RHEL 8.4 EUS Long Life kernel packages |
|---|---|
| Advisory | RHSA-2026:79778 |
| CVEs | CVE-2026-72129, CVE-2026-74705 |
| Authoritative release date | 2026-10-09 08:05:21 UTC |
| Authority revision date | 2026-10-09 11:54:59 UTC |
| Affected versions | The exact entitled RHEL 8.4 Advanced Mission Critical Update Support and RHEL 8.4 EUS Long Life kernel packages and package relationships identified by RHSA-2026:79778; compare installed NEVRAs with the authority-listed fixed content. |
| Fixed version | kernel 4.18.0-305.213.1.el8_4 and the matching advisory-listed packages, followed by a controlled reboot |
| CVSS base score | 8.1 / 8.8 (CVSS v3.1) |
| CVSS severity | High |
| Exploitation status | Not stated by the authority; no exploitation claim is inferred. |
What Changed
Red Hat published an Important kernel security update with branch-specific fixed packages for the listed vulnerabilities.
What To Validate Now
- Inventory. Locate RHEL 8.4 Advanced Mission Critical Update Support and RHEL 8.4 EUS Long Life kernel packages deployments, versions, enabled features, exposure paths, owners, and dependent services.
- Establish applicability. Compare each deployment with the authority's affected-version statement: The exact entitled RHEL 8.4 Advanced Mission Critical Update Support and RHEL 8.4 EUS Long Life kernel packages and package relationships identified by RHSA-2026:79778; compare installed NEVRAs with the authority-listed fixed content. Do not infer applicability from product family or severity alone.
- Remediate. Apply kernel 4.18.0-305.213.1.el8_4 and the matching advisory-listed packages, followed by a controlled reboot through the supported vendor or project channel, following the current advisory and change-control requirements.
- Validate. Confirm the resulting version or managed-service state, exercise representative functionality and recovery paths, monitor for regressions, and document exceptions.
- 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
Retain the prior boot entry, rebuild external modules where required, reboot in a controlled window, and validate workload, networking, storage, and recovery behavior. Preserve package, reboot, and validation evidence.
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.
