Missing Authorization Affecting kernel-rt-kvm package, versions <0:3.10.0-1160.45.1.rt56.1185.el7


Severity

0.0
high
0
10

    Threat Intelligence

    EPSS
    0.06% (24th percentile)

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  • Snyk ID SNYK-CENTOS7-KERNELRTKVM-2188689
  • published 17 Aug 2021
  • disclosed 16 Aug 2021

How to fix?

Upgrade Centos:7 kernel-rt-kvm to version 0:3.10.0-1160.45.1.rt56.1185.el7 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos. See How to fix? for Centos:7 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
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Snyk

8.8 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Changed
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
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NVD

8.8 high
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Red Hat

8.8 high
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SUSE

7.8 high