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.

Related CPE's


o

linux

linux_kernel

12

o

fedoraproject

fedora

2


o

redhat

enterprise_linux_server

2


o

redhat

enterprise_linux

6


o

redhat

enterprise_linux_eus

6

o

redhat

enterprise_linux_for_ibm_z_systems

2

o

redhat

enterprise_linux_for_ibm_z_systems_eus

3


o

redhat

enterprise_linux_for_power_little_endian

3

o

redhat

enterprise_linux_for_power_little_endian_eus

6

o

redhat

enterprise_linux_for_real_time

2

o

redhat

enterprise_linux_for_real_time_for_nfv

2

o

redhat

enterprise_linux_for_real_time_for_nfv_tus

2

o

redhat

enterprise_linux_for_real_time_tus

2


o

redhat

enterprise_linux_server_aus

4

o

redhat

enterprise_linux_server_for_power_little_endian_update_services_for_sap_solutions

4

o

redhat

enterprise_linux_server_tus

4

o

redhat

enterprise_linux_server_update_services_for_sap_solutions

5




Weaknesses



CWE-862


CWE-862

CVSS impact metrics


CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

8.8 · High

  • CVSS V3.1

  • CVSS V3.0

  • CVSS V2.0

Information


Source identifier

[email protected]

Vulnerability status

Analyzed

Published

2022-03-04T19:15:08.677

3 years ago

Last modified

2023-01-19T15:53:14.633

2 years ago