CVE-2021-3656
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- CVE-2021-3656
CVE Details
| Release Date: | 2022-03-04 |
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.
See more information about CVE-2021-3656 from MITRE CVE dictionary and NIST NVD
CVSS v3.0 metrics
NOTE: The following CVSS v3.0 metrics and score provided are preliminary and subject to review.
| Base Score: | 8.8 | Base Metrics: | AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H |
| Access Vector: | Local network | Attack Complexity: | Low |
| Privileges Required: | Low | User Interaction: | None |
| Scope: | Changed | Confidentiality Impact: | High |
| Integrity Impact: | High | Availability Impact: | High |
Errata information
| Platform | Errata | Release Date |
| Oracle Linux version 7 (kernel) | ELSA-2021-3801 | 2021-10-12 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9419 | 2021-08-16 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9420 | 2021-08-16 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9450 | 2021-09-16 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9452 | 2021-09-21 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2021-9564 | 2021-11-23 |
| Oracle Linux version 7 (kernel-uek) | ELSA-2022-9244 | 2022-03-23 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9421 | 2021-08-16 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9422 | 2021-08-16 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9451 | 2021-09-16 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9453 | 2021-09-21 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2021-9565 | 2021-11-23 |
| Oracle Linux version 7 (kernel-uek-container) | ELSA-2022-9245 | 2022-03-23 |
| Oracle Linux version 8 (kernel) | ELSA-2021-4056 | 2021-11-03 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2021-9420 | 2021-08-16 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2021-9450 | 2021-09-16 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2021-9564 | 2021-11-23 |
| Oracle Linux version 8 (kernel-uek) | ELSA-2022-9244 | 2022-03-23 |
| Oracle Linux version 8 (kernel-uek-container) | ELSA-2021-9421 | 2021-08-16 |
| Oracle Linux version 8 (kernel-uek-container) | ELSA-2021-9451 | 2021-09-16 |
| Oracle Linux version 8 (kernel-uek-container) | ELSA-2021-9565 | 2021-11-23 |
| Oracle Linux version 8 (kernel-uek-container) | ELSA-2022-9245 | 2022-03-23 |
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