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Ubuntu: (Multiple Advisories) (CVE-2018-16882): Linux kernel regression

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Ubuntu: (Multiple Advisories) (CVE-2018-16882): Linux kernel regression

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
01/03/2019
Created
03/19/2019
Added
02/05/2019
Modified
03/02/2020

Description

A use-after-free issue was found in the way the Linux kernel's KVM hypervisor processed posted interrupts when nested(=1) virtualization is enabled. In nested_get_vmcs12_pages(), in case of an error while processing posted interrupt address, it unmaps the 'pi_desc_page' without resetting 'pi_desc' descriptor address, which is later used in pi_test_and_clear_on(). A guest user/process could use this flaw to crash the host kernel resulting in DoS or potentially gain privileged access to a system. Kernel versions before 4.14.91 and before 4.19.13 are vulnerable.

Solution(s)

  • ubuntu-upgrade-linux-image-4-15-0-1027-gcp
  • ubuntu-upgrade-linux-image-4-15-0-1029-kvm
  • ubuntu-upgrade-linux-image-4-15-0-1031-raspi2
  • ubuntu-upgrade-linux-image-4-15-0-1032-aws
  • ubuntu-upgrade-linux-image-4-15-0-1033-oem
  • ubuntu-upgrade-linux-image-4-15-0-1037-azure
  • ubuntu-upgrade-linux-image-4-15-0-44-generic
  • ubuntu-upgrade-linux-image-4-15-0-44-generic-lpae
  • ubuntu-upgrade-linux-image-4-15-0-44-lowlatency
  • ubuntu-upgrade-linux-image-4-15-0-44-snapdragon
  • ubuntu-upgrade-linux-image-4-15-0-45-generic
  • ubuntu-upgrade-linux-image-4-15-0-45-generic-lpae
  • ubuntu-upgrade-linux-image-4-15-0-45-lowlatency
  • ubuntu-upgrade-linux-image-4-15-0-45-snapdragon
  • ubuntu-upgrade-linux-image-4-18-0-1006-gcp
  • ubuntu-upgrade-linux-image-4-18-0-1007-kvm
  • ubuntu-upgrade-linux-image-4-18-0-1008-aws
  • ubuntu-upgrade-linux-image-4-18-0-1008-azure
  • ubuntu-upgrade-linux-image-4-18-0-1009-raspi2
  • ubuntu-upgrade-linux-image-4-18-0-14-generic
  • ubuntu-upgrade-linux-image-4-18-0-14-generic-lpae
  • ubuntu-upgrade-linux-image-4-18-0-14-lowlatency
  • ubuntu-upgrade-linux-image-4-18-0-14-snapdragon
  • ubuntu-upgrade-linux-image-4-18-0-15-generic
  • ubuntu-upgrade-linux-image-4-18-0-15-generic-lpae
  • ubuntu-upgrade-linux-image-4-18-0-15-lowlatency
  • ubuntu-upgrade-linux-image-4-18-0-15-snapdragon
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-aws-hwe
  • ubuntu-upgrade-linux-image-azure
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-generic
  • ubuntu-upgrade-linux-image-generic-hwe-16-04
  • ubuntu-upgrade-linux-image-generic-hwe-18-04
  • ubuntu-upgrade-linux-image-generic-lpae
  • ubuntu-upgrade-linux-image-generic-lpae-hwe-16-04
  • ubuntu-upgrade-linux-image-generic-lpae-hwe-18-04
  • ubuntu-upgrade-linux-image-gke
  • ubuntu-upgrade-linux-image-kvm
  • ubuntu-upgrade-linux-image-lowlatency
  • ubuntu-upgrade-linux-image-lowlatency-hwe-16-04
  • ubuntu-upgrade-linux-image-lowlatency-hwe-18-04
  • ubuntu-upgrade-linux-image-oem
  • ubuntu-upgrade-linux-image-raspi2
  • ubuntu-upgrade-linux-image-snapdragon
  • ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
  • ubuntu-upgrade-linux-image-virtual-hwe-16-04

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