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CVE-2021-3653

CVE information

Published

2 years ago

Last Modified

11 months ago

CVSSv2.0 Severity

Medium

CVSSv3.1 Severity

High

Impact Analysis

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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..

CVSSv2.0 Score

Severity
Medium
Base Score
6.1/10
Exploit Score
3.9/10
Access Vector
Local
Access Complexity
Low
Authentication Required
None
Impact Score
8.5/10
Confidentiality Impact
Partial
Availability Impact
Complete
Integrity Impact
Partial

CVSSv3.1 Score

Severity
High
Base Score
8.8/10
Exploit Score
2/10
Access Vector
Local
Access Complexity
Low
Privileges Required
Low
Impact Score
6/10
Confidentiality Impact
High
Availability Impact
High
Integrity Impact
High
Scope
Changed
User Interaction
None

Products Affected

CPE Affected Vulnerable Excluding Edit
cpe:2.3:o:linux:linux_kernel:5.14:rc1:*:*:*:*:*:*
  Yes
- -
cpe:2.3:o:linux:linux_kernel:5.14:rc2:*:*:*:*:*:*
  Yes
- -
cpe:2.3:o:linux:linux_kernel:5.14:rc3:*:*:*:*:*:*
  Yes
- -
cpe:2.3:o:linux:linux_kernel:5.14:rc4:*:*:*:*:*:*
  Yes
- -
cpe:2.3:o:linux:linux_kernel:5.14:rc5:*:*:*:*:*:*
  Yes
- -
cpe:2.3:o:linux:linux_kernel:5.14:rc6:*:*:*:*:*:*
  Yes
- -
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  Yes
4.15 4.19.205
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  Yes
4.20 5.4.142
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  Yes
5.5 5.10.60
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  Yes
5.11 5.13.12
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  Yes
2.6.30 4.4.282
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  Yes
4.5 4.9.281
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
  Yes
4.10 4.14.245
cpe:2.3:o:redhat:enterprise_linux:7.0:*:*:*:*:*:*:*
  Yes
- -
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  Yes
- -

References