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CVE-2021-3656 Details

Description

A flaw was found in the KVM's AMD code for supporting SVM nested virtualization. The flaw occurs when processing the VMCB (virtual machine control block) provided by the L1 guest to spawn/handle a nested guest (L2). Due to improper validation of the "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) for the L2 guest. As a result, the L2 guest would be allowed to read/write physical pages of the host, resulting in a crash of the entire system, leak of sensitive data or potential guest-to-host escape.

Metrics

CVSS 3.x Severity and Vector Strings:

NIST: [email protected]CVSS-B:8.8 HIGHVector:CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

By selecting these links, you will be leaving this site. These are references gathered from the official CVE record and are not endorsed by Volerion.

URL	Source(s)	Tag(s)
https://bugzilla.redhat.com/show_bug.cgi?id=1983988	CVE	Issue TrackingThird Party Advisory
https://github.com/torvalds/linux/commit/c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc	CVE	PatchThird Party Advisory
https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc	CVE	PatchThird Party Advisory
https://www.openwall.com/lists/oss-security/2021/08/16/1	CVE	Mailing ListThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1983988	[email protected]	Issue TrackingThird Party Advisory
https://github.com/torvalds/linux/commit/c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc	[email protected]	PatchThird Party Advisory
https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc	[email protected]	PatchThird Party Advisory
https://www.openwall.com/lists/oss-security/2021/08/16/1	[email protected]	Mailing ListThird Party Advisory

see all 8 references

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-862	Missing Authorization	[email protected]
CWE-862	Missing Authorization	[email protected]

Affected Products

Product	Versions
linux linux kernel	>= 4.13, < 4.14.245 >= 4.15, < 4.19.205 >= 4.20, < 5.4.142 >= 5.5, < 5.10.60 >= 5.11, < 5.13.12
CPE cpe:2.3:o:linux:linux_kernel:::::::: cpe:2.3:o:linux:linux_kernel:5.14:-:::::: cpe:2.3:o:linux:linux_kernel:5.14:rc1:::::: cpe:2.3:o:linux:linux_kernel:5.14:rc2:::::: cpe:2.3:o:linux:linux_kernel:5.14:rc3:::::: cpe:2.3:o:linux:linux_kernel:5.14:rc4:::::: cpe:2.3:o:linux:linux_kernel:5.14:rc5:::::: cpe:2.3:o:linux:linux_kernel:5.14:rc6:::::: Remediation No remediation found in references.
fedoraproject fedora	33 34
CPE cpe:2.3:o:fedoraproject:fedora:33:::::::* cpe:2.3:o:fedoraproject:fedora:34:::::::* Remediation No remediation found in references.
redhat software collections	All versions
CPE cpe:2.3:a:redhat:software_collections:-:::::::* Remediation No remediation found in references.
redhat enterprise linux server	7.0
CPE cpe:2.3:o:redhat:enterprise_linux_server:7.0:::::::* Remediation No remediation found in references.
redhat openstack	13
CPE cpe:2.3:a:redhat:openstack:13:::::::* Remediation No remediation found in references.
redhat enterprise linux	8.0 7.0
CPE cpe:2.3:o:redhat:enterprise_linux:8.0:::::::* cpe:2.3:o:redhat:enterprise_linux:7.0:::::::* Remediation No remediation found in references.
redhat enterprise linux desktop	7.0
CPE cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:::::::* Remediation No remediation found in references.
redhat enterprise linux eus	8.1 8.2 8.4
CPE cpe:2.3:o:redhat:enterprise_linux_eus:8.1:::::::* cpe:2.3:o:redhat:enterprise_linux_eus:8.2:::::::* cpe:2.3:o:redhat:enterprise_linux_eus:8.4:::::::* Remediation No remediation found in references.
redhat enterprise linux for ibm z systems	7.0 8.0
CPE cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:7.0:::::::* cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:::::::* Remediation No remediation found in references.
redhat enterprise linux for ibm z systems eus	8.1 8.2 8.4
CPE cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.1:::::::* cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.2:::::::* cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.4:::::::* Remediation No remediation found in references.
redhat enterprise linux for power big endian	7.0
CPE cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian:7.0:::::::* Remediation No remediation found in references.
redhat enterprise linux for power little endian	7.0 8.0
CPE cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:7.0:::::::* cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:::::::* Remediation No remediation found in references.
redhat enterprise linux for power little endian eus	8.1 8.2 8.4
CPE cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.1:::::::* cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.2:::::::* cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4:::::::* Remediation No remediation found in references.
redhat enterprise linux for real time	7 8
CPE cpe:2.3:o:redhat:enterprise_linux_for_real_time:7:::::::* cpe:2.3:o:redhat:enterprise_linux_for_real_time:8:::::::* Remediation No remediation found in references.
redhat enterprise linux for real time for nfv	7 8
CPE cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv:7:::::::* cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv:8:::::::* Remediation No remediation found in references.
redhat enterprise linux for real time for nfv tus	8.2 8.4
CPE cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv_tus:8.2:::::::* cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv_tus:8.4:::::::* Remediation No remediation found in references.
redhat enterprise linux for real time tus	8.2 8.4
CPE cpe:2.3:o:redhat:enterprise_linux_for_real_time_tus:8.2:::::::* cpe:2.3:o:redhat:enterprise_linux_for_real_time_tus:8.4:::::::* Remediation No remediation found in references.
redhat enterprise linux for scientific computing	7.0
CPE cpe:2.3:o:redhat:enterprise_linux_for_scientific_computing:7.0:::::::* Remediation No remediation found in references.
redhat enterprise linux server aus	7.6 7.7 8.2 8.4
CPE cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:::::::* cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:::::::* cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:::::::* cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:::::::* Remediation No remediation found in references.
redhat enterprise linux server for power little endian update services for sap solutions	7.6 8.1 8.2 8.4
CPE cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:7.6:::::::* cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.1:::::::* cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.2:::::::* cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.4:::::::* Remediation No remediation found in references.
redhat enterprise linux server tus	7.6 7.7 8.2 8.4
CPE cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:::::::* cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:::::::* cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:::::::* cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:::::::* Remediation No remediation found in references.
redhat enterprise linux server update services for sap solutions	7.6 7.7 8.1 8.2 8.4
CPE cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:7.6:::::::* cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:7.7:::::::* cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.1:::::::* cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.2:::::::* cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.4:::::::* Remediation No remediation found in references.
redhat enterprise linux workstation	7.0
CPE cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:::::::* Remediation No remediation found in references.
redhat 3scale api management	2.0
CPE cpe:2.3:a:redhat:3scale_api_management:2.0:::::::* Remediation No remediation found in references.
redhat codeready linux builder	All versions
CPE cpe:2.3:a:redhat:codeready_linux_builder:-:::::::* Remediation No remediation found in references.
redhat virtualization host	4.0
CPE cpe:2.3:a:redhat:virtualization_host:4.0:::::::* Remediation No remediation found in references.

Change History

5 change records found show changes

Date	Action	Recorded By
Jun 17, 2026	CVE Modified	[email protected]
Nov 21, 2024	CVE Modified	CVE
May 14, 2024	CVE Modified	[email protected]
Jan 19, 2023	Reanalysis	[email protected]
Mar 10, 2022	Initial Analysis	[email protected]

CVE-2021-3656 Details

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