CVE-2021-3653

Updated: 2023-11-04 20:04:18.190504

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.


Links NIST CIRCL RHEL Ubuntu

Severity

Severity Score
CVSS Version 2.x MEDIUM 6.1
CVSS Version 3.x HIGH 8.8

Status

OS name Project name Version Score Severity Status Errata Last updated
AlmaLinux 9.2 ESU kernel 5.14.0 8.8 HIGH Already Fixed 2023-11-15 13:09:14
AlmaLinux 9.2 FIPS kernel 5.14.0 8.8 HIGH Not Vulnerable 2024-01-19 13:10:11
CentOS 6 ELS kernel 2.6.32 8.8 HIGH In Testing 2024-02-20 04:16:56
CentOS 8.4 ELS kernel 4.18.0 8.8 HIGH Already Fixed 2023-11-15 10:25:27
CentOS 8.5 ELS kernel 4.18.0 8.8 HIGH Already Fixed 2023-11-15 10:24:39
CloudLinux 6 ELS kernel 2.6.32 8.8 HIGH In Progress 2023-05-30 11:13:57
Oracle Linux 6 ELS kernel 2.6.32 8.8 HIGH In Testing 2024-02-20 04:16:56
Ubuntu 16.04 ELS linux-hwe 4.15.0 8.8 HIGH Released 2023-04-27 14:05:01
Ubuntu 16.04 ELS linux 4.4.0 8.8 HIGH Released CLSA-2022:1667414297 2022-11-02 17:08:19
Ubuntu 18.04 ELS linux 4.15.0 8.8 HIGH Already Fixed 2023-06-02 09:10:27