Missing Authorization Affecting kernel-debug-modules package, versions <0:4.18.0-305.19.1.el8_4


Severity

Recommended
medium

Based on CentOS security rating.

Threat Intelligence

EPSS
0.08% (37th percentile)

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  • Snyk IDSNYK-CENTOS8-KERNELDEBUGMODULES-2119117
  • published17 Aug 2021
  • disclosed16 Aug 2021

Introduced: 16 Aug 2021

CVE-2021-3653  (opens in a new tab)
CWE-862  (opens in a new tab)

How to fix?

Upgrade Centos:8 kernel-debug-modules to version 0:4.18.0-305.19.1.el8_4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-debug-modules package and not the kernel-debug-modules package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

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.

CVSS Scores

version 3.1