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Ubuntu: (Multiple Advisories) (CVE-2021-3493): Linux kernel regression

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Ubuntu: (Multiple Advisories) (CVE-2021-3493): Linux kernel regression

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
04/15/2021
Created
04/20/2021
Added
04/16/2021
Modified
07/06/2021

Description

The overlayfs implementation in the linux kernel did not properly validate with respect to user namespaces the setting of file capabilities on files in an underlying file system. Due to the combination of unprivileged user namespaces along with a patch carried in the Ubuntu kernel to allow unprivileged overlay mounts, an attacker could use this to gain elevated privileges.

Solution(s)

  • ubuntu-upgrade-linux-image-4-15-0-1017-dell300x
  • ubuntu-upgrade-linux-image-4-15-0-1070-oracle
  • ubuntu-upgrade-linux-image-4-15-0-1084-raspi2
  • ubuntu-upgrade-linux-image-4-15-0-1090-kvm
  • ubuntu-upgrade-linux-image-4-15-0-1098-gcp
  • ubuntu-upgrade-linux-image-4-15-0-1099-aws
  • ubuntu-upgrade-linux-image-4-15-0-1101-snapdragon
  • ubuntu-upgrade-linux-image-4-15-0-1113-azure
  • ubuntu-upgrade-linux-image-4-15-0-142-generic
  • ubuntu-upgrade-linux-image-4-15-0-142-generic-lpae
  • ubuntu-upgrade-linux-image-4-15-0-142-lowlatency
  • ubuntu-upgrade-linux-image-4-4-0-1091-aws
  • ubuntu-upgrade-linux-image-4-4-0-1092-aws
  • ubuntu-upgrade-linux-image-4-4-0-1092-kvm
  • ubuntu-upgrade-linux-image-4-4-0-1093-kvm
  • ubuntu-upgrade-linux-image-4-4-0-1127-aws
  • ubuntu-upgrade-linux-image-4-4-0-1128-aws
  • ubuntu-upgrade-linux-image-4-4-0-1151-raspi2
  • ubuntu-upgrade-linux-image-4-4-0-1152-raspi2
  • ubuntu-upgrade-linux-image-4-4-0-1155-snapdragon
  • ubuntu-upgrade-linux-image-4-4-0-1156-snapdragon
  • ubuntu-upgrade-linux-image-4-4-0-209-generic
  • ubuntu-upgrade-linux-image-4-4-0-209-generic-lpae
  • ubuntu-upgrade-linux-image-4-4-0-209-lowlatency
  • ubuntu-upgrade-linux-image-4-4-0-209-powerpc-e500mc
  • ubuntu-upgrade-linux-image-4-4-0-209-powerpc-smp
  • ubuntu-upgrade-linux-image-4-4-0-209-powerpc64-emb
  • ubuntu-upgrade-linux-image-4-4-0-209-powerpc64-smp
  • ubuntu-upgrade-linux-image-4-4-0-210-generic
  • ubuntu-upgrade-linux-image-4-4-0-210-generic-lpae
  • ubuntu-upgrade-linux-image-4-4-0-210-lowlatency
  • ubuntu-upgrade-linux-image-4-4-0-210-powerpc-e500mc
  • ubuntu-upgrade-linux-image-4-4-0-210-powerpc-smp
  • ubuntu-upgrade-linux-image-4-4-0-210-powerpc64-emb
  • ubuntu-upgrade-linux-image-4-4-0-210-powerpc64-smp
  • ubuntu-upgrade-linux-image-5-10-0-1022-oem
  • ubuntu-upgrade-linux-image-5-3-0-1039-raspi2
  • ubuntu-upgrade-linux-image-5-3-0-1040-raspi2
  • ubuntu-upgrade-linux-image-5-3-0-1042-gke
  • ubuntu-upgrade-linux-image-5-3-0-1043-gke
  • ubuntu-upgrade-linux-image-5-3-0-73-generic
  • ubuntu-upgrade-linux-image-5-3-0-73-lowlatency
  • ubuntu-upgrade-linux-image-5-3-0-74-generic
  • ubuntu-upgrade-linux-image-5-3-0-74-lowlatency
  • ubuntu-upgrade-linux-image-5-4-0-1014-gkeop
  • ubuntu-upgrade-linux-image-5-4-0-1034-raspi
  • ubuntu-upgrade-linux-image-5-4-0-1038-kvm
  • ubuntu-upgrade-linux-image-5-4-0-1042-gcp
  • ubuntu-upgrade-linux-image-5-4-0-1042-gke
  • ubuntu-upgrade-linux-image-5-4-0-1043-oracle
  • ubuntu-upgrade-linux-image-5-4-0-1045-aws
  • ubuntu-upgrade-linux-image-5-4-0-1046-azure
  • ubuntu-upgrade-linux-image-5-4-0-72-generic
  • ubuntu-upgrade-linux-image-5-4-0-72-generic-lpae
  • ubuntu-upgrade-linux-image-5-4-0-72-lowlatency
  • ubuntu-upgrade-linux-image-5-6-0-1054-oem
  • ubuntu-upgrade-linux-image-5-6-0-1055-oem
  • ubuntu-upgrade-linux-image-5-8-0-1021-raspi
  • ubuntu-upgrade-linux-image-5-8-0-1021-raspi-nolpae
  • ubuntu-upgrade-linux-image-5-8-0-1024-kvm
  • ubuntu-upgrade-linux-image-5-8-0-1026-oracle
  • ubuntu-upgrade-linux-image-5-8-0-1028-gcp
  • ubuntu-upgrade-linux-image-5-8-0-1029-azure
  • ubuntu-upgrade-linux-image-5-8-0-1030-aws
  • ubuntu-upgrade-linux-image-5-8-0-50-generic
  • ubuntu-upgrade-linux-image-5-8-0-50-generic-64k
  • ubuntu-upgrade-linux-image-5-8-0-50-generic-lpae
  • ubuntu-upgrade-linux-image-5-8-0-50-lowlatency
  • ubuntu-upgrade-linux-image-aws
  • ubuntu-upgrade-linux-image-aws-hwe
  • ubuntu-upgrade-linux-image-aws-lts-18-04
  • ubuntu-upgrade-linux-image-azure
  • ubuntu-upgrade-linux-image-azure-lts-18-04
  • ubuntu-upgrade-linux-image-dell300x
  • ubuntu-upgrade-linux-image-gcp
  • ubuntu-upgrade-linux-image-gcp-lts-18-04
  • 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-16-04
  • ubuntu-upgrade-linux-image-generic-hwe-18-04
  • ubuntu-upgrade-linux-image-generic-hwe-20-04
  • 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-generic-lpae-hwe-20-04
  • ubuntu-upgrade-linux-image-generic-lpae-lts-xenial
  • ubuntu-upgrade-linux-image-generic-lts-xenial
  • ubuntu-upgrade-linux-image-gke
  • ubuntu-upgrade-linux-image-gke-5-3
  • ubuntu-upgrade-linux-image-gke-5-4
  • ubuntu-upgrade-linux-image-gkeop
  • ubuntu-upgrade-linux-image-gkeop-5-3
  • ubuntu-upgrade-linux-image-gkeop-5-4
  • 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-lowlatency-hwe-20-04
  • ubuntu-upgrade-linux-image-lowlatency-lts-xenial
  • ubuntu-upgrade-linux-image-oem
  • ubuntu-upgrade-linux-image-oem-20-04
  • ubuntu-upgrade-linux-image-oem-20-04b
  • ubuntu-upgrade-linux-image-oem-osp1
  • ubuntu-upgrade-linux-image-oracle
  • ubuntu-upgrade-linux-image-oracle-lts-18-04
  • ubuntu-upgrade-linux-image-powerpc-e500mc
  • ubuntu-upgrade-linux-image-powerpc-e500mc-lts-xenial
  • ubuntu-upgrade-linux-image-powerpc-smp
  • ubuntu-upgrade-linux-image-powerpc-smp-lts-xenial
  • ubuntu-upgrade-linux-image-powerpc64-emb
  • ubuntu-upgrade-linux-image-powerpc64-emb-lts-xenial
  • ubuntu-upgrade-linux-image-powerpc64-smp
  • ubuntu-upgrade-linux-image-powerpc64-smp-lts-xenial
  • ubuntu-upgrade-linux-image-raspi
  • ubuntu-upgrade-linux-image-raspi-hwe-18-04
  • ubuntu-upgrade-linux-image-raspi-nolpae
  • ubuntu-upgrade-linux-image-raspi2
  • ubuntu-upgrade-linux-image-raspi2-hwe-18-04
  • ubuntu-upgrade-linux-image-snapdragon
  • ubuntu-upgrade-linux-image-snapdragon-hwe-18-04
  • ubuntu-upgrade-linux-image-virtual
  • ubuntu-upgrade-linux-image-virtual-hwe-16-04
  • ubuntu-upgrade-linux-image-virtual-hwe-18-04
  • ubuntu-upgrade-linux-image-virtual-hwe-20-04
  • ubuntu-upgrade-linux-image-virtual-lts-xenial

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