Ubuntu 20.04 & 18.04 LTS USN-5318-1 Moderate: Kernel Denial of Service

ubuntu

March 8, 2022

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: Linux kernel for Microsoft Azure Cloud systems

- linux-azure-fde: Linux kernel for Microsoft Azure cloud systems

- linux-bluefield: Linux kernel for NVIDIA BlueField platforms

- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems

- linux-gke: Linux kernel for Google Container Engine (GKE) systems

- linux-gkeop: Linux kernel for Google Container Engine (GKE) systems

- linux-ibm: Linux kernel for IBM cloud systems

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-raspi: Linux kernel for Raspberry Pi systems

- linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems

- linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems

- linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems

- linux-gke-5.4: Linux kerne...

Read the Full Advisory

Topics Covered

security advisory moderate denial of service kernel system update ubuntu execution risk

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-1017-ibm      5.4.0-1017.19
  linux-image-5.4.0-1030-bluefield  5.4.0-1030.33
  linux-image-5.4.0-1036-gkeop    5.4.0-1036.37
  linux-image-5.4.0-104-generic   5.4.0-104.118
  linux-image-5.4.0-104-generic-lpae  5.4.0-104.118
  linux-image-5.4.0-104-lowlatency  5.4.0-104.118
  linux-image-5.4.0-1055-raspi    5.4.0-1055.62
  linux-image-5.4.0-1058-kvm      5.4.0-1058.61
  linux-image-5.4.0-1065-gke      5.4.0-1065.68
  linux-image-5.4.0-1066-oracle   5.4.0-1066.71
  linux-image-5.4.0-1067-gcp      5.4.0-1067.71
  linux-image-5.4.0-1068-aws      5.4.0-1068.72
  linux-image-5.4.0-1072-azure    5.4.0-1072.75
  linux-image-5.4.0-1072-azure-fde  5.4.0-1072.75+cvm1.1
  linux-image-aws-lts-20.04       5.4.0.1068.70
  linux-image-azure-fde           5.4.0.1072.75+cvm1.18
  linux-image-azure-lts-20.04     5.4.0.1072.70
  linux-image-bluefield           5.4.0.1030.31
  linux-image-gcp-lts-20.04       5.4.0.1067.76
  linux-image-generic             5.4.0.104.108
  linux-image-generic-lpae        5.4.0.104.108
  linux-image-gke                 5.4.0.1065.75
  linux-image-gke-5.4             5.4.0.1065.75
  linux-image-gkeop               5.4.0.1036.39
  linux-image-gkeop-5.4           5.4.0.1036.39
  linux-image-ibm                 5.4.0.1017.17
  linux-image-ibm-lts-20.04       5.4.0.1017.17
  linux-image-kvm                 5.4.0.1058.57
  linux-image-lowlatency          5.4.0.104.108
  linux-image-oem                 5.4.0.104.108
  linux-image-oem-osp1            5.4.0.104.108
  linux-image-oracle-lts-20.04    5.4.0.1066.66
  linux-image-raspi               5.4.0.1055.89
  linux-image-raspi2              5.4.0.1055.89
  linux-image-virtual             5.4.0.104.108

Ubuntu 18.04 LTS:
  linux-image-5.4.0-1017-ibm      5.4.0-1017.19~18.04.1
  linux-image-5.4.0-1036-gkeop    5.4.0-1036.37~18.04.1
  linux-image-5.4.0-104-generic   5.4.0-104.118~18.04.1
  linux-image-5.4.0-104-generic-lpae  5.4.0-104.118~18.04.1
  linux-image-5.4.0-104-lowlatency  5.4.0-104.118~18.04.1
  linux-image-5.4.0-1055-raspi    5.4.0-1055.62~18.04.1
  linux-image-5.4.0-1065-gke      5.4.0-1065.68~18.04.1
  linux-image-5.4.0-1066-oracle   5.4.0-1066.71~18.04.1
  linux-image-5.4.0-1067-gcp      5.4.0-1067.71~18.04.1
  linux-image-5.4.0-1068-aws      5.4.0-1068.72~18.04.1
  linux-image-5.4.0-1072-azure    5.4.0-1072.75~18.04.1
  linux-image-aws                 5.4.0.1068.50
  linux-image-azure               5.4.0.1072.51
  linux-image-gcp                 5.4.0.1067.52
  linux-image-generic-hwe-18.04   5.4.0.104.118~18.04.89
  linux-image-generic-lpae-hwe-18.04  5.4.0.104.118~18.04.89
  linux-image-gke-5.4             5.4.0.1065.68~18.04.29
  linux-image-gkeop-5.4           5.4.0.1036.37~18.04.36
  linux-image-ibm                 5.4.0.1017.34
  linux-image-lowlatency-hwe-18.04  5.4.0.104.118~18.04.89
  linux-image-oem                 5.4.0.104.118~18.04.89
  linux-image-oem-osp1            5.4.0.104.118~18.04.89
  linux-image-oracle              5.4.0.1066.71~18.04.45
  linux-image-raspi-hwe-18.04     5.4.0.1055.57
  linux-image-snapdragon-hwe-18.04  5.4.0.104.118~18.04.89
  linux-image-virtual-hwe-18.04   5.4.0.104.118~18.04.89

IMPORTANT: As part of this update, unprivileged eBPF is being
disabled by default, as it is the primary known means of exploiting
the Branch History Injection issues described above. It should be
noted that other mechanisms for exploiting the underlying issues may
be discovered. Also, this may cause issues for applications that
rely on the unprivileged eBPF functionality. Please see the knowledge
base article at https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/BHI
for more details.

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