Ubuntu 18.04 LTS USN-4883-1 Critical: Kernel Threats and Fixes

ubuntu

March 19, 2021

Several security issues were fixed in the Linux kernel.

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 ...

Read the Full Advisory

Topics Covered

security advisory denial of service critical heap overflow system update ubuntu linux kernel

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.