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
No CVSS v4.0
Attack Vector Local
Attack Complexity Low
Privileges Required Low
Scope Changed
Confidentiality Impact High
Integrity Impact High
Availability Impact High
User Interaction None
No CVSS v3.0
Access Vector Local
Access Complexity Low
Authentication None
Confidentiality Impact Complete
Integrity Impact Complete
Availability Impact Complete
AV:L/AC:L/Au:N/C:C/I:C/A:C
This CVE is not in the KEV list.
Key SSVC decision points have not yet been added.
Affected Vendors & Products
Vendors | Products |
---|---|
Fedoraproject |
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Linux |
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Redhat |
|
Configuration 1 [-]
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Configuration 2 [-]
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Configuration 3 [-]
AND |
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Configuration 4 [-]
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Configuration 5 [-]
AND |
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Configuration 6 [-]
AND |
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Configuration 7 [-]
AND |
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Package | CPE | Advisory | Released Date |
---|---|---|---|
Red Hat Enterprise Linux 7 | |||
kernel-rt-0:3.10.0-1160.45.1.rt56.1185.el7 | cpe:/a:redhat:rhel_extras_rt:7 | RHSA-2021:3802 | 2021-10-12T00:00:00Z |
kernel-0:3.10.0-1160.45.1.el7 | cpe:/o:redhat:enterprise_linux:7 | RHSA-2021:3801 | 2021-10-12T00:00:00Z |
Red Hat Enterprise Linux 7.6 Advanced Update Support | |||
kernel-0:3.10.0-957.84.1.el7 | cpe:/o:redhat:rhel_aus:7.6 | RHSA-2021:3812 | 2021-10-12T00:00:00Z |
Red Hat Enterprise Linux 7.6 Telco Extended Update Support | |||
kernel-0:3.10.0-957.84.1.el7 | cpe:/o:redhat:rhel_tus:7.6 | RHSA-2021:3812 | 2021-10-12T00:00:00Z |
Red Hat Enterprise Linux 7.6 Update Services for SAP Solutions | |||
kernel-0:3.10.0-957.84.1.el7 | cpe:/o:redhat:rhel_e4s:7.6 | RHSA-2021:3812 | 2021-10-12T00:00:00Z |
Red Hat Enterprise Linux 7.7 Advanced Update Support | |||
kernel-0:3.10.0-1062.59.1.el7 | cpe:/o:redhat:rhel_aus:7.7 | RHSA-2021:3987 | 2021-10-26T00:00:00Z |
Red Hat Enterprise Linux 7.7 Telco Extended Update Support | |||
kernel-0:3.10.0-1062.59.1.el7 | cpe:/o:redhat:rhel_tus:7.7 | RHSA-2021:3987 | 2021-10-26T00:00:00Z |
Red Hat Enterprise Linux 7.7 Update Services for SAP Solutions | |||
kernel-0:3.10.0-1062.59.1.el7 | cpe:/o:redhat:rhel_e4s:7.7 | RHSA-2021:3987 | 2021-10-26T00:00:00Z |
Red Hat Enterprise Linux 8 | |||
kernel-rt-0:4.18.0-305.25.1.rt7.97.el8_4 | cpe:/a:redhat:enterprise_linux:8::nfv | RHSA-2021:4088 | 2021-11-02T00:00:00Z |
kernel-0:4.18.0-305.25.1.el8_4 | cpe:/o:redhat:enterprise_linux:8 | RHSA-2021:4056 | 2021-11-02T00:00:00Z |
Red Hat Enterprise Linux 8.1 Extended Update Support | |||
kernel-0:4.18.0-147.56.1.el8_1 | cpe:/o:redhat:rhel_eus:8.1 | RHSA-2021:3676 | 2021-09-28T00:00:00Z |
Red Hat Enterprise Linux 8.2 Extended Update Support | |||
kernel-rt-0:4.18.0-193.68.1.rt13.118.el8_2 | cpe:/a:redhat:rhel_eus:8.2::nfv | RHSA-2021:3909 | 2021-10-19T00:00:00Z |
kernel-0:4.18.0-193.68.1.el8_2 | cpe:/o:redhat:rhel_eus:8.2 | RHSA-2021:3904 | 2021-10-19T00:00:00Z |
References
History
No history.
MITRE
Status: PUBLISHED
Assigner: redhat
Published: 2022-03-04T18:41:26
Updated: 2024-08-03T17:01:07.792Z
Reserved: 2021-07-21T00:00:00
Link: CVE-2021-3656
Vulnrichment
No data.
NVD
Status : Modified
Published: 2022-03-04T19:15:08.677
Modified: 2024-11-21T06:22:05.187
Link: CVE-2021-3656
Redhat