CVE-2023-30456

MEDIUMNVD 6.57.8▲
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2023-04-10. NVD baseline CVSS 6.5; sources differ by 1.3.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 6.5Exploit: NoneExposed: 0

A fix is available — apply it.

An issue was discovered in arch/x86/kvm/vmx/nested.c in the Linux kernel before 6.2.8. nVMX on x86_64 lacks consistency checks for CR0 and CR4.

CVSS v3
6.5
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
38.2%
KEV
Not listed

Published

April 10, 2023

Last Modified

March 19, 2025

References (12)

Vendor Advisories for CVE-2023-30456(4)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(22)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulinux-tools-aws-hwe (4.15.0.1157.140) @ xenial2026-05-25ubuntu
ubuntulinux-cloud-tools-6.2.0-23 (6.2.0-23.23) @ lunar2026-05-25ubuntu
ubuntulinux-headers-azure-fde (5.15.0.1039.46.16) @ jammy2026-05-25ubuntu
ubuntulinux-image-lowlatency (5.4.0.150.148) @ focal2026-05-25ubuntu
ubuntulinux-tools-5.15.0-1031-intel-iotg (5.15.0-1031.36~20.04.1) @ focal2026-05-25ubuntu
ubuntulinux-buildinfo-6.2.0-1007-gcp (6.2.0-1007.7) @ lunar2026-05-25ubuntu
ubuntulinux-image-unsigned-4.4.0-241-lowlatency (4.4.0-241.275) @ xenial2026-05-25ubuntu
ubuntulinux-headers-bluefield (5.4.0.1064.59) @ focal2026-05-25ubuntu
ubuntulinux-headers-5.4.0-1024-xilinx-zynqmp (5.4.0-1024.28) @ focal2026-05-25ubuntu
ubuntulinux-tools-5.15.0-1031-intel-iotg (5.15.0-1031.36) @ jammy2026-05-25ubuntu
ubuntulinux-virtual (3.13.0.197.207) @ trusty2026-05-25ubuntu
ubuntulowlatency-4.4 (4.4.0-168) @ xenial2026-05-25ubuntu
ubuntulinux-tools-iot (5.4.0.1017.15) @ focal2026-05-25ubuntu
ubuntulinux-tools-oem-22.04c (6.1.0.1009.9) @ jammy2026-05-25ubuntu
ubuntulinux-oem-22.04a (5.17.0.1032.30) @ jammy2026-05-25ubuntu
ubuntulinux-modules-iwlwifi-oem-22.04b (6.0.0.1017.17) @ jammy2026-05-25ubuntu
ubuntulinux-headers-5.15.0-73-generic-64k (5.15.0-73.80) @ jammy2026-05-25ubuntu
redhatkernel-0:4.18.0-477.51.1.el8_82024-03-19redhat
redhatkernel-0:4.18.0-372.93.1.el8_62024-02-21redhat
redhatkernel-rt-0:4.18.0-513.5.1.rt7.307.el8_92023-11-14redhat
redhatkernel-0:4.18.0-513.5.1.el8_92023-11-14redhat
redhatkernel-0:5.14.0-362.8.1.el9_32023-11-07redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(19)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 14× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 108 total refreshes for this CVE.

  1. 2026-07-23 02:21 UTCEG score recompute
  2. 2026-07-22 23:09 UTCEG score recompute
  3. 2026-07-22 14:06 UTCEPSS rescore
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Frequently asked(5)

What is CVE-2023-30456?
CVE-2023-30456 is a medium vulnerability published on April 10, 2023. An issue was discovered in arch/x86/kvm/vmx/nested.c in the Linux kernel before 6.2.8. nVMX on x86_64 lacks consistency checks for CR0 and CR4.
When was CVE-2023-30456 disclosed?
CVE-2023-30456 was first published in the National Vulnerability Database on April 10, 2023, with the most recent update on March 19, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-30456 actively exploited?
CVE-2023-30456 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 38.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-30456?
CVE-2023-30456 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 7.8.
How do I remediate CVE-2023-30456?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-30456, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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