High7.1Vendor: MediumRed Hat & Ubuntu Linux
validate nested VLAN headers
CVE-2026-31684 Published Apr 25, 2026
CVE-2026-31684
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
Summary
validate nested VLAN headers. Red Hat rates this moderate (CVSS 7.1). Weakness: CWE-1285. Affected package(s): kernel, kernel-rt. Resolved in Red Hat advisory RHSA-2026:21745 — update the affected packages (`sudo dnf update`).
Affected versions
- kernel-0:4.18.0-553.126.1.el8_10
- kernel-rt-0:4.18.0-553.126.1.rt7.467.el8_10
- kernel-0:6.12.0-211.18.1.el10_2
- kernel-0:5.14.0-687.12.1.el9_8
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
Fixed versions
- RHSA-2026:21745
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
Mitigation checklist
Recommended fix / mitigation
- Update the affected package(s) to the fixed version shipped in RHSA-2026:21745 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
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