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Ubuntu: (Multiple Advisories) (CVE-2021-27363): Linux kernel vulnerabilities

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Ubuntu: (Multiple Advisories) (CVE-2021-27363): Linux kernel vulnerabilities

Severity
4
CVSS
(AV:L/AC:L/Au:N/C:P/I:N/A:P)
Published
03/07/2021
Created
03/23/2021
Added
03/20/2021
Modified
03/22/2023

Description

An issue was discovered in the Linux kernel through 5.11.3. A kernel pointer leak can be used to determine the address of the iscsi_transport structure. When an iSCSI transport is registered with the iSCSI subsystem, the transport's handle is available to unprivileged users via the sysfs file system, at /sys/class/iscsi_transport/$TRANSPORT_NAME/handle. When read, the show_transport_handle function (in drivers/scsi/scsi_transport_iscsi.c) is called, which leaks the handle. This handle is actually the pointer to an iscsi_transport struct in the kernel module's global variables.

Solution(s)

  • ubuntu-upgrade-linux-image-3-13-0-185-generic
  • ubuntu-upgrade-linux-image-3-13-0-185-generic-lpae
  • ubuntu-upgrade-linux-image-3-13-0-185-lowlatency
  • ubuntu-upgrade-linux-image-4-15-0-1067-oracle
  • ubuntu-upgrade-linux-image-4-15-0-1081-raspi2
  • ubuntu-upgrade-linux-image-4-15-0-1087-kvm
  • ubuntu-upgrade-linux-image-4-15-0-1095-gcp
  • ubuntu-upgrade-linux-image-4-15-0-1096-aws
  • ubuntu-upgrade-linux-image-4-15-0-1098-snapdragon
  • ubuntu-upgrade-linux-image-4-15-0-1110-azure
  • ubuntu-upgrade-linux-image-4-15-0-139-generic
  • ubuntu-upgrade-linux-image-4-15-0-139-generic-lpae
  • ubuntu-upgrade-linux-image-4-15-0-139-lowlatency
  • ubuntu-upgrade-linux-image-4-4-0-1088-aws
  • ubuntu-upgrade-linux-image-4-4-0-1090-kvm
  • ubuntu-upgrade-linux-image-4-4-0-1124-aws
  • ubuntu-upgrade-linux-image-4-4-0-1148-raspi2
  • ubuntu-upgrade-linux-image-4-4-0-1152-snapdragon
  • ubuntu-upgrade-linux-image-4-4-0-206-generic
  • ubuntu-upgrade-linux-image-4-4-0-206-generic-lpae
  • ubuntu-upgrade-linux-image-4-4-0-206-lowlatency
  • ubuntu-upgrade-linux-image-4-4-0-206-powerpc-e500mc
  • ubuntu-upgrade-linux-image-4-4-0-206-powerpc-smp
  • ubuntu-upgrade-linux-image-4-4-0-206-powerpc64-emb
  • ubuntu-upgrade-linux-image-4-4-0-206-powerpc64-smp
  • ubuntu-upgrade-linux-image-5-10-0-1019-oem
  • ubuntu-upgrade-linux-image-5-3-0-1038-raspi2
  • ubuntu-upgrade-linux-image-5-3-0-1041-gke
  • ubuntu-upgrade-linux-image-5-3-0-72-generic
  • ubuntu-upgrade-linux-image-5-3-0-72-lowlatency
  • ubuntu-upgrade-linux-image-5-4-0-1012-gkeop
  • ubuntu-upgrade-linux-image-5-4-0-1032-raspi
  • ubuntu-upgrade-linux-image-5-4-0-1036-kvm
  • ubuntu-upgrade-linux-image-5-4-0-1039-gke
  • ubuntu-upgrade-linux-image-5-4-0-1040-gcp
  • ubuntu-upgrade-linux-image-5-4-0-1041-aws
  • ubuntu-upgrade-linux-image-5-4-0-1041-oracle
  • ubuntu-upgrade-linux-image-5-4-0-1043-azure
  • ubuntu-upgrade-linux-image-5-4-0-70-generic
  • ubuntu-upgrade-linux-image-5-4-0-70-generic-lpae
  • ubuntu-upgrade-linux-image-5-4-0-70-lowlatency
  • ubuntu-upgrade-linux-image-5-6-0-1052-oem
  • ubuntu-upgrade-linux-image-5-8-0-1019-raspi
  • ubuntu-upgrade-linux-image-5-8-0-1019-raspi-nolpae
  • ubuntu-upgrade-linux-image-5-8-0-1022-kvm
  • ubuntu-upgrade-linux-image-5-8-0-1024-oracle
  • ubuntu-upgrade-linux-image-5-8-0-1026-azure
  • ubuntu-upgrade-linux-image-5-8-0-1026-gcp
  • ubuntu-upgrade-linux-image-5-8-0-1027-aws
  • ubuntu-upgrade-linux-image-5-8-0-48-generic
  • ubuntu-upgrade-linux-image-5-8-0-48-generic-64k
  • ubuntu-upgrade-linux-image-5-8-0-48-generic-lpae
  • ubuntu-upgrade-linux-image-5-8-0-48-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-edge
  • ubuntu-upgrade-linux-image-azure-lts-18-04
  • 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-trusty
  • ubuntu-upgrade-linux-image-generic-lts-xenial
  • ubuntu-upgrade-linux-image-generic-pae
  • 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-lowlatency-pae
  • 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-smp
  • ubuntu-upgrade-linux-image-powerpc64-emb
  • ubuntu-upgrade-linux-image-powerpc64-smp
  • 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-server
  • 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

References

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