Ubuntu 20.04 LTS: USN-4411-1 Critical: Multiple Kernel Issues

ubuntu

July 2, 2020

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

- linux-kvm: Linux kernel for cloud environments

- linux-oracle: Linux kernel for Oracle Cloud systems

- linux-riscv: Linux kernel for RISC-V systems

Details:

It was discovered that the elf handling code in the Linux kernel did not

initialize memory before using it in certain situations. A local attacker

could use this to possibly expose sensitive information (kernel memory).

(CVE-2020-10732)

Matthew Sheets discovered that the SELinux network label handling

implementation in the Linux kernel could be coerced into de-referencing a

NULL pointer. A remote attacker could use this to cause a denial of service

(system crash). (CVE-2020-10711)

It was discovered that the SCSI generic (sg) driver in the Linux kernel did

not properly handle certain error condit...

Read the Full Advisory

Topics Covered

security advisory denial of service ubuntu system crash linux kernel linux drivers

Update Instructions

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

Ubuntu 20.04 LTS:
  linux-image-5.4.0-1018-aws      5.4.0-1018.18
  linux-image-5.4.0-1019-gcp      5.4.0-1019.19
  linux-image-5.4.0-1019-oracle   5.4.0-1019.19
  linux-image-5.4.0-28-generic    5.4.0-28.32
  linux-image-5.4.0-40-generic    5.4.0-40.44
  linux-image-5.4.0-40-generic-lpae  5.4.0-40.44
  linux-image-5.4.0-40-lowlatency  5.4.0-40.44
  linux-image-aws                 5.4.0.1018.19
  linux-image-gcp                 5.4.0.1019.17
  linux-image-generic             5.4.0.28.35
  linux-image-generic-lpae        5.4.0.40.43
  linux-image-gke                 5.4.0.1019.17
  linux-image-kvm                 5.4.0.1018.17
  linux-image-lowlatency          5.4.0.40.43
  linux-image-oem                 5.4.0.40.43
  linux-image-oem-osp1            5.4.0.40.43
  linux-image-oracle              5.4.0.1019.17
  linux-image-virtual             5.4.0.28.35

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.