High7.8Vendor: MediumRed Hat & Ubuntu Linux
fix possible UAF in macvlan_forward_source()
CVE-2026-23001 Published Jan 25, 2026
CVE-2026-23001
Affected products & platforms
Red Hat & Ubuntu LinuxUnclassified
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 versions
- 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 4 hours ago·verify at source
Fixed versions
- RHSA-2026:3966
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-2026:3966 (`sudo dnf update` / `yum update`).
Official advisory · high-confidence parse· fetched 4 hours ago·verify at source
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