CVE-2021-3656

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 "virt_ext" field, this issue could allow a malicious L1 to disable both VMLOAD/VMSAVE intercepts and VLS (Virtual VMLOAD/VMSAVE) 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.

• Fedora Project Fedora

  OS
  Fedoraproject
  3334

• Linux Kernel

  OS
  Linux
  5.145.5 – 5.10.60 (bez)5.11 – 5.13.12 (bez)4.13 – 4.14.245 (bez)4.15 – 4.19.205 (bez)4.20 – 5.4.142 (bez)

• Red Hat 3scale Api Management

  APP
  Redhat
  2.0

• Red Hat Codeready Linux Builder

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  Redhat
  wszystkie wersje

• Red Hat Enterprise Linux

  OS
  Redhat
  7.08.0

• Red Hat Enterprise Linux Desktop

  OS
  Redhat
  7.0

• Red Hat Enterprise Linux Eus

  OS
  Redhat
  8.18.28.4

• Red Hat Enterprise Linux For IBM Z Systems

  OS
  Redhat
  7.08.0

• Red Hat Enterprise Linux For IBM Z Systems Eus

  OS
  Redhat
  8.18.28.4

• Red Hat Enterprise Linux For Power Big Endian

  OS
  Redhat
  7.0

• Red Hat Enterprise Linux For Power Little Endian

  OS
  Redhat
  7.08.0

• Red Hat Enterprise Linux For Power Little Endian Eus

  OS
  Redhat
  8.18.28.4

• Red Hat Enterprise Linux For Real Time

  OS
  Redhat
  78

• Red Hat Enterprise Linux For Real Time For Nfv

  OS
  Redhat
  78

• Red Hat Enterprise Linux For Real Time For Nfv Tus

  OS
  Redhat
  8.28.4

• Red Hat Enterprise Linux For Real Time Tus

  OS
  Redhat
  8.28.4

• Red Hat Enterprise Linux For Scientific Computing

  OS
  Redhat
  7.0

• Red Hat Enterprise Linux Server

  OS
  Redhat
  7.0

• Red Hat Enterprise Linux Server Aus

  OS
  Redhat
  7.67.78.28.4

• Red Hat Enterprise Linux Server For Power Little Endian Update Services For Sap Solutions

  OS
  Redhat
  7.68.18.28.4

• Red Hat Enterprise Linux Server Tus

  OS
  Redhat
  7.67.78.28.4

• Red Hat Enterprise Linux Server Update Services For Sap Solutions

  OS
  Redhat
  7.67.78.18.28.4

• Red Hat Enterprise Linux Workstation

  OS
  Redhat
  7.0

• Red Hat Openstack

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  Redhat
  13

• Red Hat Software Collections

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  wszystkie wersje

• Red Hat Virtualization Host

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  Redhat
  4.0