CVE-2021-3653

Published Sep 29, 2021

Last updated a year ago

Overview

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 "int_ctl" field, this issue could allow a malicious L1 to enable AVIC support (Advanced Virtual Interrupt Controller) 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. This flaw affects Linux kernel versions prior to 5.14-rc7.
Source
secalert@redhat.com
NVD status
Analyzed

Risk scores

CVSS 3.1

Type
Primary
Base score
8.8
Impact score
6
Exploitability score
2
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Severity
HIGH

CVSS 2.0

Type
Primary
Base score
6.1
Impact score
8.5
Exploitability score
3.9
Vector string
AV:L/AC:L/Au:N/C:P/I:P/A:C

Weaknesses

secalert@redhat.com
CWE-862
nvd@nist.gov
CWE-862

Social media

Hype score
Not currently trending

Configurations