What is CVE-2023-30456?

CVE-2023-30456 is a medium-severity vulnerability in Linux Kernel, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 6.5/10. Published 2023-04-10.

How severe is CVE-2023-30456?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Is CVE-2023-30456 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Vulnerability in Linux Kernel

CVE-2023-30456

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.

Published 2023-04-10 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.005 (38.6th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 39th percentile — 38.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Linux Kernel — versions 6.3

Weakness classification (CWE)

CWE-754 — Improper Check for Unusual or Exceptional Conditions

Public proof-of-concept exploits

ARPSyndicate/cve-scores

References

Frequently asked questions

What is CVE-2023-30456?: CVE-2023-30456 is a medium-severity vulnerability in Linux Kernel, classified under Improper Check for Unusual or Exceptional Conditions. CVSS score: 6.5/10. Published 2023-04-10.
How severe is CVE-2023-30456?: Medium severity. CVSS v3 base score is 6.5 out of 10.
Is CVE-2023-30456 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.