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.
References
| Link | Resource |
|---|---|
| https://bugzilla.redhat.com/show_bug.cgi?id=1983988 | Issue Tracking Third Party Advisory |
| https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc | Patch Third Party Advisory |
| https://github.com/torvalds/linux/commit/c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc | Patch Third Party Advisory |
| https://www.openwall.com/lists/oss-security/2021/08/16/1 | Mailing List Third Party Advisory |
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History
10 Mar 2022, 18:55
| Type | Values Removed | Values Added |
|---|---|---|
| References | (MISC) https://git.kernel.org/pub/scm/virt/kvm/kvm.git/commit/?id=c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc - Patch, Third Party Advisory | |
| References | (MISC) https://bugzilla.redhat.com/show_bug.cgi?id=1983988 - Issue Tracking, Third Party Advisory | |
| References | (MISC) https://www.openwall.com/lists/oss-security/2021/08/16/1 - Mailing List, Third Party Advisory | |
| References | (MISC) https://github.com/torvalds/linux/commit/c7dfa4009965a9b2d7b329ee970eb8da0d32f0bc - Patch, Third Party Advisory | |
| CWE | CWE-862 | |
| CVSS |
v2 : v3 : |
v2 : 7.2
v3 : 8.8 |
| CPE | cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_tus:7.7:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv:8:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.1:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_scientific_computing:7.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:7.0:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.14:rc6:*:*:*:*:*:* cpe:2.3:a:redhat:software_collections:-:*:*:*:*:*:*:* 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_update_services_for_sap_solutions:7.7:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_real_time_tus:8.2:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:8.0:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.14:rc4:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:* cpe:2.3:a:redhat:3scale_api_management:2.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:* 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_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_tus:7.6:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_real_time_tus:8.4:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.4:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:7.6:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_power_big_endian:7.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:7.6:*:*:*:*:*:*:* cpe:2.3:a:redhat:openstack:13:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.4:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv_tus:8.2:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.14:rc5:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems:8.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian:7.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.2:*:*:*:*:*:*:* cpe:2.3:a:redhat:virtualization_host:4.0:*:*:*:*:*:*:* cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv_tus:8.4:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_power_little_endian_eus:8.2:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_ibm_z_systems_eus:8.1:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.1:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.14:-:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_aus:7.6:*:*:*:*:*:*:* cpe:2.3:a:redhat:codeready_linux_builder:-:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_aus:7.7:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_real_time:8:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions:8.4:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv:7:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_server_update_services_for_sap_solutions:8.2:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:* cpe:2.3:o:redhat:enterprise_linux_for_real_time:7:*:*:*:*:*:*:* |
04 Mar 2022, 19:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2022-03-04 19:15
Updated : 2024-02-04 22:29
NVD link : CVE-2021-3656
Mitre link : CVE-2021-3656
CVE.ORG link : CVE-2021-3656
JSON object : View
Products Affected
redhat
- enterprise_linux_for_ibm_z_systems
- enterprise_linux_server
- enterprise_linux_for_power_little_endian
- enterprise_linux_for_scientific_computing
- enterprise_linux_for_ibm_z_systems_eus
- virtualization_host
- enterprise_linux_for_real_time_for_nfv_tus
- enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions
- openstack
- 3scale_api_management
- enterprise_linux_desktop
- software_collections
- enterprise_linux
- enterprise_linux_for_power_little_endian_eus
- enterprise_linux_for_real_time_for_nfv
- enterprise_linux_eus
- enterprise_linux_server_tus
- enterprise_linux_server_update_services_for_sap_solutions
- enterprise_linux_for_real_time_tus
- enterprise_linux_server_aus
- codeready_linux_builder
- enterprise_linux_workstation
- enterprise_linux_for_power_big_endian
- enterprise_linux_for_real_time
fedoraproject
- fedora
linux
- linux_kernel
CWE
CWE-862
Missing Authorization