Executive Summary

Informations
Name CVE-2021-3653 First vendor Publication 2021-09-29
Vendor Cve Last vendor Modification 2022-03-31

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Overall CVSS Score 8.8
Base Score 8.8 Environmental Score 8.8
impact SubScore 6 Temporal Score 8.8
Exploitabality Sub Score 2
 
Attack Vector Local Attack Complexity Low
Privileges Required Low User Interaction None
Scope Changed Confidentiality Impact High
Integrity Impact High Availability Impact High
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:L/AC:L/Au:N/C:P/I:P/A:C)
Cvss Base Score 6.1 Attack Range Local
Cvss Impact Score 8.5 Attack Complexity Low
Cvss Expoit Score 3.9 Authentication None Required
Calculate full CVSS 2.0 Vectors scores

Detail

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.

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3653

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 7
Os 1
Os 3414
Os 1

Sources (Detail)

Source Url
MISC http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice...
https://bugzilla.redhat.com/show_bug.cgi?id=1983686
https://www.openwall.com/lists/oss-security/2021/08/16/1
MLIST https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html

Alert History

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Date Informations
2022-04-01 00:23:11
  • Multiple Updates
2022-03-11 01:57:58
  • Multiple Updates
2022-02-01 01:51:58
  • Multiple Updates
2022-01-07 00:23:01
  • Multiple Updates
2021-12-17 09:23:04
  • Multiple Updates
2021-12-11 12:52:50
  • Multiple Updates
2021-12-11 01:49:43
  • Multiple Updates
2021-10-16 09:23:05
  • Multiple Updates
2021-10-08 21:23:16
  • Multiple Updates
2021-09-30 00:22:53
  • First insertion