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 github.com. 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 cdn.kernel.org. Applying the patch 112e66017bff7f2837030f34c2bc19501e9212d5 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.
CVSSv3VulDB 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: 🔍
ExploitingClass: Privilege Escalation
Status: Not defined
EPSS Score: 🔒
EPSS Percentile: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
Threat IntelligenceInterest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍
0-Day Time: 🔒
Upgrade: Kernel 6.2.8/6.3-rc3
Timeline04/10/2023 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
CVE: CVE-2023-30456 (🔒)
EntryCreated: 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)
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