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Advisory severityHigh8.1Red 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.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-23401 Source published

VulniPulse record published

CVE-2026-23401
Affected products & platforms
Red Hat LinuxUnclassified
Open source advisory

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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 3 months ago·verify at source

Fixed versions
  • RHSA-2026:13936

Official advisory · high-confidence parse· fetched 3 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 3 months ago·verify at source

Discussion(0)

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