🛡️ UBUNTU-CVE-2021-3653
⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity Unknown
CVSS Score N/A
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source OSV
Published 2021-08-16
Updated 2026-06-15
Modified 2026-06-03
Fix URL N/A

Affected Packages

Software From version Fixed in
linux 5.4.0-84.94
linux-aws 5.4.0-1056.59
linux-aws-5.0
linux-aws-5.11 5.11.0-1017.18~20.04.1
linux-aws-5.3
linux-aws-5.4 5.4.0-1056.59~18.04.1
linux-aws-5.8
linux-aws-fips
linux-aws-hwe 4.15.0-1111.118~16.04.1
linux-azure 5.4.0-1058.60
linux-azure-4.15 4.15.0-1123.136
linux-azure-5.11 5.11.0-1015.16~20.04.1
linux-azure-5.3
linux-azure-5.4 5.4.0-1058.60~18.04.1
linux-azure-5.8 5.8.0-1041.44~20.04.1
linux-azure-edge
linux-azure-fips
linux-bluefield
linux-dell300x 4.15.0-1027.32
linux-fips
linux-gcp 5.4.0-1052.56
linux-gcp-4.15 4.15.0-1108.122
linux-gcp-5.11 5.11.0-1018.20~20.04.2
linux-gcp-5.3
linux-gcp-5.4 5.4.0-1052.56~18.04.1
linux-gcp-5.8
linux-gcp-edge
linux-gcp-fips
linux-gke 5.4.0-1052.55
linux-gke-4.15
linux-gke-5.4 5.4.0-1052.55~18.04.1
linux-gkeop 5.4.0-1023.24
linux-gkeop-5.4 5.4.0-1023.24~18.04.1
linux-hwe
linux-hwe-5.11 5.11.0-34.36~20.04.1
linux-hwe-5.4 5.4.0-84.94~18.04.1
linux-hwe-5.8
linux-hwe-edge
linux-intel-iot-realtime
linux-kvm 5.4.0-1046.48
linux-lts-xenial 4.4.0-214.246~14.04.1
linux-oem
linux-oem-5.10 5.10.0-1045.47
linux-oem-5.13 5.13.0-1012.16
linux-oem-5.6
linux-oracle 5.4.0-1054.58
linux-oracle-5.0
linux-oracle-5.11 5.11.0-1017.18~20.04.1
linux-oracle-5.3
linux-oracle-5.4 5.4.0-1054.58~18.04.1
linux-oracle-5.8
linux-raspi-realtime
linux-realtime
linux-riscv-5.11 5.11.0-1018.19~20.04.2
linux-snapdragon 4.15.0-1112.121

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