Ubuntu 20.04 LTS USN-6185-1 Critical: Kernel Denial Of Service Flaws

ubuntu

June 22, 2023

Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

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

- linux-azure: 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

Details:

It was discovered that the TUN/TAP driver in the Linux kernel did not

properly initialize socket data. A local attacker could use this to cause a

denial of service (system crash). (CVE-2023-1076)

It was discovered that the Real-Time Scheduling Class implementation in the

Linux kernel c...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel system update ubuntu

Update Instructions

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

Ubuntu 20.04 LTS:
   linux-image-5.4.0-1051-ibm      5.4.0-1051.56
   linux-image-5.4.0-1065-bluefield  5.4.0-1065.71
   linux-image-5.4.0-1071-gkeop    5.4.0-1071.75
   linux-image-5.4.0-1088-raspi    5.4.0-1088.99
   linux-image-5.4.0-1093-kvm      5.4.0-1093.99
   linux-image-5.4.0-1102-gke      5.4.0-1102.109
   linux-image-5.4.0-1103-oracle   5.4.0-1103.112
   linux-image-5.4.0-1104-aws      5.4.0-1104.112
   linux-image-5.4.0-1107-gcp      5.4.0-1107.116
   linux-image-5.4.0-1110-azure    5.4.0-1110.116
   linux-image-aws-lts-20.04       5.4.0.1104.101
   linux-image-azure-lts-20.04     5.4.0.1110.103
   linux-image-bluefield           5.4.0.1065.60
   linux-image-gcp-lts-20.04       5.4.0.1107.109
   linux-image-gke                 5.4.0.1102.107
   linux-image-gke-5.4             5.4.0.1102.107
   linux-image-gkeop               5.4.0.1071.69
   linux-image-gkeop-5.4           5.4.0.1071.69
   linux-image-ibm                 5.4.0.1051.77
   linux-image-ibm-lts-20.04       5.4.0.1051.77
   linux-image-kvm                 5.4.0.1093.88
   linux-image-oracle-lts-20.04    5.4.0.1103.96
   linux-image-raspi               5.4.0.1088.118
   linux-image-raspi2              5.4.0.1088.118

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.