High [CVE-2026-21863] Denial of Service via invalid clusterbus packet
This high-severity Red Hat Linux advisory covers CVE-2026-21863 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 9, Red Hat Hardened Images.
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Summary
Denial of Service via invalid clusterbus packet. Red Hat rates this important (CVSS 7.5).
Weakness: CWE-125. Affected package(s): valkey, valkey-main.
Resolved in Red Hat advisory RHSA-2026:3507 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 10.0 Extended Update Support; Red Hat Enterprise Linux 9; Red Hat Hardened Images.
- valkey-0:8.0.7-1.el9_7
- valkey-main-9.0.3-1.2.hum1
- valkey-0:8.0.7-1.el10_0
- valkey-0:8.0.7-1.el10_1
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:3507
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
Mitigation checklist
- Update the affected package(s) to the fixed version shipped in RHSA-2026:3507 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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