CVEvulnerability

CVE-2021-3656

8.8 HIGH Published 2022-03-04 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2022-03-04
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
8.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS 2.0 ([email protected])
7.2 HIGH — AV:L/AC:L/Au:N/C:C/I:C/A:C
Weaknesses
CWE-862

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.

Affected configurations

• linux linux kernel (>= 4.13 < 4.14.245) • linux linux kernel (>= 4.15 < 4.19.205) • linux linux kernel (>= 4.20 < 5.4.142) • linux linux kernel (>= 5.5 < 5.10.60) • linux linux kernel (>= 5.11 < 5.13.12) • linux linux kernel 5.14 • fedoraproject fedora 33 • fedoraproject fedora 34 • redhat software collections • redhat openstack 13 • redhat enterprise linux 8.0 • redhat enterprise linux desktop 7.0 • redhat enterprise linux eus 8.1 • redhat enterprise linux eus 8.2 • redhat enterprise linux eus 8.4 • redhat enterprise linux for ibm z systems 7.0 • redhat enterprise linux for ibm z systems 8.0 • redhat enterprise linux for ibm z systems eus 8.1 • redhat enterprise linux for ibm z systems eus 8.2 • redhat enterprise linux for ibm z systems eus 8.4 • redhat enterprise linux for power big endian 7.0 • redhat enterprise linux for power little endian 7.0 • redhat enterprise linux for power little endian 8.0 • redhat enterprise linux for power little endian eus 8.1 • redhat enterprise linux for power little endian eus 8.2 • redhat enterprise linux for power little endian eus 8.4 • redhat enterprise linux for real time 7 • redhat enterprise linux for real time 8 • redhat enterprise linux for real time for nfv 7 • redhat enterprise linux for real time for nfv 8 • redhat enterprise linux for real time for nfv tus 8.2 • redhat enterprise linux for real time for nfv tus 8.4 • redhat enterprise linux for real time tus 8.2 • redhat enterprise linux for real time tus 8.4 • redhat enterprise linux for scientific computing 7.0 • redhat enterprise linux server 7.0 • redhat enterprise linux server aus 7.6 • redhat enterprise linux server aus 7.7 • redhat enterprise linux server aus 8.2 • redhat enterprise linux server aus 8.4 • redhat enterprise linux server for power little endian update services for sap solutions 7.6 • redhat enterprise linux server for power little endian update services for sap solutions 8.1 • redhat enterprise linux server for power little endian update services for sap solutions 8.2 • redhat enterprise linux server for power little endian update services for sap solutions 8.4 • redhat enterprise linux server tus 7.6 • redhat enterprise linux server tus 7.7 • redhat enterprise linux server tus 8.2 • redhat enterprise linux server tus 8.4 • redhat enterprise linux server update services for sap solutions 7.6 • redhat enterprise linux server update services for sap solutions 7.7 • redhat enterprise linux server update services for sap solutions 8.1 • redhat enterprise linux server update services for sap solutions 8.2 • redhat enterprise linux server update services for sap solutions 8.4 • redhat enterprise linux workstation 7.0 • redhat 3scale api management 2.0 • redhat codeready linux builder • redhat virtualization host 4.0

Related

Weakness · CWE (1)

  • CWE-862 Missing Authorization weakness

References