High [CVE-2026-23001] fix possible UAF in macvlan_forward_source()
This high-severity Red Hat Linux advisory covers CVE-2026-23001 affecting Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 1.
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Summary
fix possible UAF in macvlan_forward_source(). Red Hat rates this moderate (CVSS 7.8).
Weakness: CWE-416. Affected package(s): kernel, kernel-rt.
Resolved in Red Hat advisory RHSA-2026:3966 — 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 1.
- kernel-0:4.18.0-305.194.1.el8_4
- kernel-rt-0:4.18.0-553.111.1.rt7.452.el8_10
- kernel-0:5.14.0-284.164.1.el9_2
- kernel-0:4.18.0-553.111.1.el8_10
- kernel-0:6.12.0-124.43.1.el10_1
- kernel-0:5.14.0-70.175.1.el9_0
- kernel-0:5.14.0-611.38.1.el9_7
- kernel-0:6.12.0-55.70.1.el10_0
- kernel-rt-0:5.14.0-70.175.1.rt21.247.el9_0
- kernel-0:5.14.0-427.117.1.el9_4
- kernel-0:4.18.0-372.195.1.el8_6
- kernel-rt-0:5.14.0-284.164.1.rt14.449.el9_2
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
- RHSA-2026:3966
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-2026:3966 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 2 months ago·verify at source
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