Linux Kernel up to 6.2.7 on x86-64bit nVMX nested.c nested_vmx_check_guest_state Privilege Escalation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.2.7 on x86-64bit (Operating System). This affects the function nested_vmx_check_guest_state of the file arch/x86/kvm/vmx/nested.c of the component nVMX. The impact remains unknown. The summary by CVE is:

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.

The weakness was presented 04/10/2023 as 112e66017bff7f2837030f34c2bc19501e9212d5. It is possible to read the advisory at This vulnerability is uniquely identified as CVE-2023-30456 since 04/10/2023. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 04/26/2023).

Upgrading to version 6.2.8 or 6.3-rc3 eliminates this vulnerability. The upgrade is hosted for download at Applying the patch 112e66017bff7f2837030f34c2bc19501e9212d5 is able to eliminate this problem. The bugfix is ready for download at The best possible mitigation is suggested to be upgrading to the latest version.







CPE 2.3info

CPE 2.2info


VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔒



VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍


Class: Privilege Escalation
CWE: Unknown
ATT&CK: Unknown

Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒


Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍


Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.2.8/6.3-rc3
Patch: 112e66017bff7f2837030f34c2bc19501e9212d5


04/10/2023 Advisory disclosed
04/10/2023 +0 days CVE reserved
04/10/2023 +0 days VulDB entry created
04/26/2023 +16 days VulDB entry last update



Advisory: 112e66017bff7f2837030f34c2bc19501e9212d5
Status: Confirmed

CVE: CVE-2023-30456 (🔒)


Created: 04/10/2023 09:43 AM
Updated: 04/26/2023 12:47 PM
Changes: 04/10/2023 09:43 AM (46), 04/26/2023 12:47 PM (11)
Complete: 🔍


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