Linux Kernel up to 5.14-rc6 KVM Subsystem arch/x86/kvm/lapic.c kvm_free_lapic cleanup

CVSS Meta Temp Score
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CTI Interest Score
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6.2$0-$5k0.00

Summaryinfo

A vulnerability marked as problematic has been reported in Linux Kernel up to 5.14-rc6. Impacted is the function kvm_free_lapic of the file arch/x86/kvm/lapic.c of the component KVM Subsystem. The manipulation leads to cleanup. This vulnerability is referenced as CVE-2021-4032. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 5.14-rc6 (Operating System). This issue affects the function kvm_free_lapic of the file arch/x86/kvm/lapic.c of the component KVM Subsystem. The manipulation with an unknown input leads to a cleanup vulnerability. Using CWE to declare the problem leads to CWE-459. The product does not properly "clean up" and remove temporary or supporting resources after they have been used. Impacted is availability.

The weakness was published 01/22/2022. The advisory is shared at lkml.org. The identification of this vulnerability is CVE-2021-4032 since 11/29/2021. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 239850 (TencentOS Server 4: kernel (TSSA-2024:0980)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.14-rc7 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (239850). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.5
VulDB Meta Temp Score: 6.2

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Cleanup
CWE: CWE-459
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Nessus ID: 239850
Nessus Name: TencentOS Server 4: kernel (TSSA-2024:0980)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.14-rc7
Patch: git.kernel.org

Timelineinfo

11/29/2021 🔍
01/22/2022 +54 days 🔍
01/22/2022 +0 days 🔍
06/19/2025 +1244 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: lkml.org
Status: Confirmed

CVE: CVE-2021-4032 (🔍)
GCVE (CVE): GCVE-0-2021-4032
GCVE (VulDB): GCVE-100-191405

Entryinfo

Created: 01/22/2022 07:52
Updated: 06/19/2025 19:41
Changes: 01/22/2022 07:52 (43), 01/27/2022 09:27 (1), 01/27/2022 09:32 (1), 06/19/2025 19:41 (16)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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