CVE-2021-3653 - CVE House

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Status published High CVE-2021-3653

A flaw was found in the KVM's AMD code for...

8.8 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

More from n/a

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Versions of the package jsondiffpatch before 0.7.2 are vulnerable to...

RemoteClinic profile.php sql injection

Langfuse Webhook promptRouter.ts promptChangeEventSourcing server-side request forgery

RemoteClinic edit-my-profile.php unrestricted upload

RemoteClinic edit-patient.php information disclosure

Affected Vendor

n/a

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Affected Software

kernel

Vulnerable Versions:

kernel 5.14-rc7

Timeline

Official Publish: September 29th, 2021

Last Modified: August 3rd, 2024

Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

T1190 Exploit Public-Facing Application

T1068 Exploitation for Privilege Escalation

Privilege Escalation

T1078 Valid Accounts

T1531 Account Access Removal