Linux Kernel up to 5.11.11 AMD KVM Guest nested.c nested_svm_vmrun use after free

CVSS Meta Temp Score
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CTI Interest Score
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4.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 5.11.11. This issue affects the function nested_svm_vmrun of the file arch/x86/kvm/svm/nested.c of the component AMD KVM Guest Handler. This manipulation causes use after free. This vulnerability is registered as CVE-2021-29657. No exploit is available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.11.11 (Operating System). Affected by this vulnerability is the function nested_svm_vmrun of the file arch/x86/kvm/svm/nested.c of the component AMD KVM Guest Handler. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 07/22/2021. The advisory is shared at bugs.chromium.org. This vulnerability is known as CVE-2021-29657. Technical details are known, but no exploit is available.

Upgrading to version 5.11.12 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org. 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.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.4

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
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: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 5.11.12
Patch: git.kernel.org

Timelineinfo

03/31/2021 🔍
07/22/2021 +113 days 🔍
07/22/2021 +0 days 🔍
07/27/2021 +5 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: bugs.chromium.org
Status: Confirmed
Confirmation: 🔍

CVE: CVE-2021-29657 (🔍)
GCVE (CVE): GCVE-0-2021-29657
GCVE (VulDB): GCVE-100-179425

Entryinfo

Created: 07/22/2021 21:39
Updated: 07/27/2021 09:46
Changes: 07/22/2021 21:39 (44), 07/27/2021 09:46 (3)
Complete: 🔍
Cache ID: 216::103

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