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Ubuntu: USN-5265-1 (CVE-2021-4093): Linux kernel vulnerabilities

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Ubuntu: USN-5265-1 (CVE-2021-4093): Linux kernel vulnerabilities

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
02/03/2022
Created
02/05/2022
Added
02/03/2022
Modified
03/22/2023

Description

A flaw was found in the KVM's AMD code for supporting the Secure Encrypted Virtualization-Encrypted State (SEV-ES). A KVM guest using SEV-ES can trigger out-of-bounds reads and writes in the host kernel via a malicious VMGEXIT for a string I/O instruction (for example, outs or ins) using the exit reason SVM_EXIT_IOIO. This issue results in a crash of the entire system or a potential guest-to-host escape scenario.

Solution(s)

  • ubuntu-upgrade-linux-image-5-11-0-1028-azure
  • ubuntu-upgrade-linux-image-5-11-0-1028-oracle
  • ubuntu-upgrade-linux-image-5-11-0-1029-gcp
  • ubuntu-upgrade-linux-image-5-13-0-1011-kvm
  • ubuntu-upgrade-linux-image-5-13-0-1012-aws
  • ubuntu-upgrade-linux-image-5-13-0-1013-gcp
  • ubuntu-upgrade-linux-image-5-13-0-1016-oracle
  • ubuntu-upgrade-linux-image-5-13-0-1016-raspi
  • ubuntu-upgrade-linux-image-5-13-0-1016-raspi-nolpae
  • ubuntu-upgrade-linux-image-5-13-0-1029-oem
  • ubuntu-upgrade-linux-image-5-13-0-28-generic
  • ubuntu-upgrade-linux-image-5-13-0-28-generic-64k
  • ubuntu-upgrade-linux-image-5-13-0-28-generic-lpae
  • ubuntu-upgrade-linux-image-5-13-0-28-lowlatency
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-azure
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-64k
  • ubuntu-upgrade-linux-image-generic-64k-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-lpae
  • ubuntu-upgrade-linux-image-generic-lpae-hwe-20-04
  • ubuntu-upgrade-linux-image-gke
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-hwe-20-04
  • ubuntu-upgrade-linux-image-oem-20-04
  • ubuntu-upgrade-linux-image-oem-20-04c
  • ubuntu-upgrade-linux-image-oracle
  • ubuntu-upgrade-linux-image-raspi
  • ubuntu-upgrade-linux-image-raspi-nolpae
  • ubuntu-upgrade-linux-image-virtual
  • ubuntu-upgrade-linux-image-virtual-hwe-20-04

References

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