High8.1Red Hat Linux

High [CVE-2026-23401] Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling

This high-severity Red Hat Linux advisory covers CVE-2026-23401 affecting Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.6 Telecommunications Update Service.

CVE-2026-23401 Published Apr 1, 2026

CVE-2026-23401

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

Linux kernel KVM: Privilege escalation or denial of service due to improper shadow page table entry handling. Red Hat rates this important (CVSS 8.1).

Weakness: CWE-416. Affected package(s): kernel, kernel-rt.

Resolved in Red Hat advisory RHSA-2026:13936 — 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 8.6 Advanced Mission Critical Update Support; Red Hat Enterprise Linux 8.6 Telecommunications Update Service; Red Hat Enterprise Linux 8.6 Update Services for SAP Solutions; and 6 more.

Affected versions

kernel-0:4.18.0-553.123.1.el8_10
kernel-0:5.14.0-284.172.1.el9_2
kernel-0:6.12.0-55.72.1.el10_0
kernel-rt-0:5.14.0-70.178.1.rt21.250.el9_0
kernel-rt-0:4.18.0-553.123.1.rt7.464.el8_10
kernel-0:5.14.0-687.10.1.el9_8
kernel-0:4.18.0-372.191.1.el8_6
kernel-0:5.14.0-70.178.1.el9_0
kernel-0:5.14.0-427.124.1.el9_4
kernel-0:6.12.0-211.16.1.el10_2
kernel-rt-0:5.14.0-284.172.1.rt14.457.el9_2
kernel-0:4.18.0-477.143.1.el8_8

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions

RHSA-2026:13936

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation

Update the affected package(s) to the fixed version shipped in RHSA-2026:13936 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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