=========================================================================Ubuntu Security Notice USN-4883-1
March 20, 2021

linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp,
linux-gcp-4.15, linux-hwe, linux-kvm, linux-raspi2, linux-snapdragon
vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in the Linux kernel.

Software Description:
- linux: Linux kernel
- linux-aws: Linux kernel for Amazon Web Services (AWS) systems
- linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi (V8) systems
- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
- linux-azure: Linux kernel for Microsoft Azure Cloud systems
- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

Adam Nichols discovered that heap overflows existed in the iSCSI subsystem
in the Linux kernel. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2021-27365)

Adam Nichols discovered that the iSCSI subsystem in the Linux kernel did
not properly restrict access to iSCSI transport handles. A local attacker
could use this to cause a denial of service or expose sensitive information
(kernel pointer addresses). (CVE-2021-27363)

Adam Nichols discovered that an out-of-bounds read existed in the iSCSI
subsystem in the Linux kernel. A local attacker could use this to cause a
denial of service (system crash) or expose sensitive information (kernel
memory). (CVE-2021-27364)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 18.04 LTS:
  linux-image-4.15.0-1081-raspi2  4.15.0-1081.86
  linux-image-4.15.0-1087-kvm     4.15.0-1087.89
  linux-image-4.15.0-1095-gcp     4.15.0-1095.108
  linux-image-4.15.0-1096-aws     4.15.0-1096.103
  linux-image-4.15.0-1098-snapdragon  4.15.0-1098.107
  linux-image-4.15.0-1110-azure   4.15.0-1110.122
  linux-image-4.15.0-139-generic  4.15.0-139.143
  linux-image-4.15.0-139-generic-lpae  4.15.0-139.143
  linux-image-4.15.0-139-lowlatency  4.15.0-139.143
  linux-image-aws-lts-18.04       4.15.0.1096.99
  linux-image-azure-lts-18.04     4.15.0.1110.83
  linux-image-gcp-lts-18.04       4.15.0.1095.113
  linux-image-generic             4.15.0.139.126
  linux-image-generic-lpae        4.15.0.139.126
  linux-image-kvm                 4.15.0.1087.83
  linux-image-lowlatency          4.15.0.139.126
  linux-image-powerpc-e500mc      4.15.0.139.126
  linux-image-powerpc-smp         4.15.0.139.126
  linux-image-powerpc64-emb       4.15.0.139.126
  linux-image-powerpc64-smp       4.15.0.139.126
  linux-image-raspi2              4.15.0.1081.78
  linux-image-snapdragon          4.15.0.1098.101
  linux-image-virtual             4.15.0.139.126

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1095-gcp     4.15.0-1095.108~16.04.1
  linux-image-4.15.0-1096-aws     4.15.0-1096.103~16.04.1
  linux-image-4.15.0-1110-azure   4.15.0-1110.122~16.04.1
  linux-image-4.15.0-139-generic  4.15.0-139.143~16.04.1
  linux-image-4.15.0-139-generic-lpae  4.15.0-139.143~16.04.1
  linux-image-4.15.0-139-lowlatency  4.15.0-139.143~16.04.1
  linux-image-4.4.0-1090-kvm      4.4.0-1090.99
  linux-image-4.4.0-1124-aws      4.4.0-1124.138
  linux-image-4.4.0-1152-snapdragon  4.4.0-1152.162
  linux-image-4.4.0-206-generic   4.4.0-206.238
  linux-image-4.4.0-206-generic-lpae  4.4.0-206.238
  linux-image-4.4.0-206-lowlatency  4.4.0-206.238
  linux-image-4.4.0-206-powerpc-e500mc  4.4.0-206.238
  linux-image-4.4.0-206-powerpc-smp  4.4.0-206.238
  linux-image-4.4.0-206-powerpc64-emb  4.4.0-206.238
  linux-image-4.4.0-206-powerpc64-smp  4.4.0-206.238
  linux-image-aws                 4.4.0.1124.129
  linux-image-aws-hwe             4.15.0.1096.89
  linux-image-azure               4.15.0.1110.101
  linux-image-azure-edge          4.15.0.1110.101
  linux-image-gcp                 4.15.0.1095.96
  linux-image-generic             4.4.0.206.212
  linux-image-generic-hwe-16.04   4.15.0.139.134
  linux-image-generic-lpae        4.4.0.206.212
  linux-image-generic-lpae-hwe-16.04  4.15.0.139.134
  linux-image-gke                 4.15.0.1095.96
  linux-image-kvm                 4.4.0.1090.88
  linux-image-lowlatency          4.4.0.206.212
  linux-image-lowlatency-hwe-16.04  4.15.0.139.134
  linux-image-oem                 4.15.0.139.134
  linux-image-powerpc-e500mc      4.4.0.206.212
  linux-image-powerpc-smp         4.4.0.206.212
  linux-image-powerpc64-emb       4.4.0.206.212
  linux-image-powerpc64-smp       4.4.0.206.212
  linux-image-snapdragon          4.4.0.1152.144
  linux-image-virtual             4.4.0.206.212
  linux-image-virtual-hwe-16.04   4.15.0.139.134

Ubuntu 14.04 ESM:
  linux-image-4.15.0-1110-azure   4.15.0-1110.122~14.04.1
  linux-image-4.4.0-1088-aws      4.4.0-1088.92
  linux-image-aws                 4.4.0.1088.85
  linux-image-azure               4.15.0.1110.83

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References:
  https://ubuntu.com/security/notices/USN-4883-1
  CVE-2021-27363, CVE-2021-27364, CVE-2021-27365

Package Information:
  https://launchpad.net/ubuntu/+source/linux/4.15.0-139.143
  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1096.103
  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1110.122
  https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1095.108
  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1087.89
  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1081.86
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1098.107
  https://launchpad.net/ubuntu/+source/linux/4.4.0-206.238
  https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1124.138
  https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1096.103~16.04.1
  https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1110.122~16.04.1
  https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1095.108~16.04.1
  https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-139.143~16.04.1
  https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1090.99
  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1152.162

Ubuntu 4883-1: Linux kernel vulnerabilities

March 19, 2021
Several security issues were fixed in the Linux kernel.

Summary

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-1081-raspi2 4.15.0-1081.86 linux-image-4.15.0-1087-kvm 4.15.0-1087.89 linux-image-4.15.0-1095-gcp 4.15.0-1095.108 linux-image-4.15.0-1096-aws 4.15.0-1096.103 linux-image-4.15.0-1098-snapdragon 4.15.0-1098.107 linux-image-4.15.0-1110-azure 4.15.0-1110.122 linux-image-4.15.0-139-generic 4.15.0-139.143 linux-image-4.15.0-139-generic-lpae 4.15.0-139.143 linux-image-4.15.0-139-lowlatency 4.15.0-139.143 linux-image-aws-lts-18.04 4.15.0.1096.99 linux-image-azure-lts-18.04 4.15.0.1110.83 linux-image-gcp-lts-18.04 4.15.0.1095.113 linux-image-generic 4.15.0.139.126 linux-image-generic-lpae 4.15.0.139.126 linux-image-kvm 4.15.0.1087.83 linux-image-lowlatency 4.15.0.139.126 linux-image-powerpc-e500mc 4.15.0.139.126 linux-image-powerpc-smp 4.15.0.139.126 linux-image-powerpc64-emb 4.15.0.139.126 linux-image-powerpc64-smp 4.15.0.139.126 linux-image-raspi2 4.15.0.1081.78 linux-image-snapdragon 4.15.0.1098.101 linux-image-virtual 4.15.0.139.126 Ubuntu 16.04 LTS: linux-image-4.15.0-1095-gcp 4.15.0-1095.108~16.04.1 linux-image-4.15.0-1096-aws 4.15.0-1096.103~16.04.1 linux-image-4.15.0-1110-azure 4.15.0-1110.122~16.04.1 linux-image-4.15.0-139-generic 4.15.0-139.143~16.04.1 linux-image-4.15.0-139-generic-lpae 4.15.0-139.143~16.04.1 linux-image-4.15.0-139-lowlatency 4.15.0-139.143~16.04.1 linux-image-4.4.0-1090-kvm 4.4.0-1090.99 linux-image-4.4.0-1124-aws 4.4.0-1124.138 linux-image-4.4.0-1152-snapdragon 4.4.0-1152.162 linux-image-4.4.0-206-generic 4.4.0-206.238 linux-image-4.4.0-206-generic-lpae 4.4.0-206.238 linux-image-4.4.0-206-lowlatency 4.4.0-206.238 linux-image-4.4.0-206-powerpc-e500mc 4.4.0-206.238 linux-image-4.4.0-206-powerpc-smp 4.4.0-206.238 linux-image-4.4.0-206-powerpc64-emb 4.4.0-206.238 linux-image-4.4.0-206-powerpc64-smp 4.4.0-206.238 linux-image-aws 4.4.0.1124.129 linux-image-aws-hwe 4.15.0.1096.89 linux-image-azure 4.15.0.1110.101 linux-image-azure-edge 4.15.0.1110.101 linux-image-gcp 4.15.0.1095.96 linux-image-generic 4.4.0.206.212 linux-image-generic-hwe-16.04 4.15.0.139.134 linux-image-generic-lpae 4.4.0.206.212 linux-image-generic-lpae-hwe-16.04 4.15.0.139.134 linux-image-gke 4.15.0.1095.96 linux-image-kvm 4.4.0.1090.88 linux-image-lowlatency 4.4.0.206.212 linux-image-lowlatency-hwe-16.04 4.15.0.139.134 linux-image-oem 4.15.0.139.134 linux-image-powerpc-e500mc 4.4.0.206.212 linux-image-powerpc-smp 4.4.0.206.212 linux-image-powerpc64-emb 4.4.0.206.212 linux-image-powerpc64-smp 4.4.0.206.212 linux-image-snapdragon 4.4.0.1152.144 linux-image-virtual 4.4.0.206.212 linux-image-virtual-hwe-16.04 4.15.0.139.134 Ubuntu 14.04 ESM: linux-image-4.15.0-1110-azure 4.15.0-1110.122~14.04.1 linux-image-4.4.0-1088-aws 4.4.0-1088.92 linux-image-aws 4.4.0.1088.85 linux-image-azure 4.15.0.1110.83 After a standard system update you need to reboot your computer to make all the necessary changes. ATTENTION: Due to an unavoidable ABI change the kernel updates have been given a new version number, which requires you to recompile and reinstall all third party kernel modules you might have installed. Unless you manually uninstalled the standard kernel metapackages (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual, linux-powerpc), a standard system upgrade will automatically perform this as well.

References

https://ubuntu.com/security/notices/USN-4883-1

CVE-2021-27363, CVE-2021-27364, CVE-2021-27365

Severity
March 20, 2021

Package Information

https://launchpad.net/ubuntu/+source/linux/4.15.0-139.143 https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1096.103 https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1110.122 https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1095.108 https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1087.89 https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1081.86 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1098.107 https://launchpad.net/ubuntu/+source/linux/4.4.0-206.238 https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1124.138 https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1096.103~16.04.1 https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1110.122~16.04.1 https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1095.108~16.04.1 https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-139.143~16.04.1 https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1090.99 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1152.162

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