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Vulnerability Details : CVE-2021-3653

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.
Publish Date : 2021-09-29 Last Update Date : 2022-01-06
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- CVSS Scores & Vulnerability Types

CVSS Score
6.1
Confidentiality Impact Partial (There is considerable informational disclosure.)
Integrity Impact Partial (Modification of some system files or information is possible, but the attacker does not have control over what can be modified, or the scope of what the attacker can affect is limited.)
Availability Impact Complete (There is a total shutdown of the affected resource. The attacker can render the resource completely unavailable.)
Access Complexity Low (Specialized access conditions or extenuating circumstances do not exist. Very little knowledge or skill is required to exploit. )
Authentication Not required (Authentication is not required to exploit the vulnerability.)
Gained Access None
Vulnerability Type(s)
CWE ID 862

- Related OVAL Definitions

Title Definition Id Class Family
RHSA-2021:3547: kernel-rt security and bug fix update (Moderate) oval:com.redhat.rhsa:def:20213547 unix
RHSA-2021:3548: kernel security, bug fix, and enhancement update (Moderate) oval:com.redhat.rhsa:def:20213548 unix
RHSA-2021:3801: kernel security and bug fix update (Important) oval:com.redhat.rhsa:def:20213801 unix
RHSA-2021:3802: kernel-rt security and bug fix update (Important) oval:com.redhat.rhsa:def:20213802 unix
OVAL (Open Vulnerability and Assessment Language) definitions define exactly what should be done to verify a vulnerability or a missing patch. Check out the OVAL definitions if you want to learn what you should do to verify a vulnerability.

- Products Affected By CVE-2021-3653

# Product Type Vendor Product Version Update Edition Language
1 OS Linux Linux Kernel * * * * Version Details Vulnerabilities
2 OS Linux Linux Kernel 5.14 - * * Version Details Vulnerabilities
3 OS Linux Linux Kernel 5.14 RC6 * * Version Details Vulnerabilities
4 OS Linux Linux Kernel 5.14 RC1 * * Version Details Vulnerabilities
5 OS Linux Linux Kernel 5.14 RC2 * * Version Details Vulnerabilities
6 OS Linux Linux Kernel 5.14 RC3 * * Version Details Vulnerabilities
7 OS Linux Linux Kernel 5.14 RC4 * * Version Details Vulnerabilities
8 OS Linux Linux Kernel 5.14 RC5 * * Version Details Vulnerabilities
9 OS Redhat Enterprise Linux 7.0 * * * Version Details Vulnerabilities

- Number Of Affected Versions By Product

Vendor Product Vulnerable Versions
Linux Linux Kernel 8
Redhat Enterprise Linux 1

- References For CVE-2021-3653

https://lists.debian.org/debian-lts-announce/2021/12/msg00012.html
MLIST [debian-lts-announce] 20211216 [SECURITY] [DLA 2843-1] linux security update
http://packetstormsecurity.com/files/165477/Kernel-Live-Patch-Security-Notice-LSN-0083-1.html
https://lists.debian.org/debian-lts-announce/2021/10/msg00010.html
MLIST [debian-lts-announce] 20211015 [SECURITY] [DLA 2785-1] linux-4.19 security update
https://www.openwall.com/lists/oss-security/2021/08/16/1
https://bugzilla.redhat.com/show_bug.cgi?id=1983686

- Metasploit Modules Related To CVE-2021-3653

There are not any metasploit modules related to this CVE entry (Please visit www.metasploit.com for more information)


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