High [CVE-2026-31685] reject invalid MAC header for all packets
This high-severity Red Hat Linux advisory covers CVE-2026-31685 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 7.
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Summary
reject invalid MAC header for all packets. Red Hat rates this moderate (CVSS 7.1).
Weakness: CWE-1287. Affected package(s): kernel, kernel-rt.
Resolved in Red Hat advisory RHSA-2026:26462 — update the affected packages (`sudo dnf update`).
Affected products named by the advisory: Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 1.
- kernel-0:4.18.0-305.194.1.el8_4
- kernel-0:4.18.0-553.126.1.el8_10
- kernel-0:5.14.0-427.129.1.el9_4
- kernel-0:3.10.0-1160.151.1.el7
- kernel-0:6.12.0-55.77.1.el10_0
- kernel-0:4.18.0-372.195.1.el8_6
- kernel-0:5.14.0-284.176.1.el9_2
- kernel-rt-0:5.14.0-284.176.1.rt14.461.el9_2
- kernel-0:4.18.0-477.147.1.el8_8
- 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 2 months ago·verify at source
- RHSA-2026:26462
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-2026:26462 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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