1. Ubuntu Security Notices
  2. USN-4411-1

USN-4411-1: Linux kernel vulnerabilities

Publication date

6 July 2020

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel
  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud 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-raspi - Linux kernel for Raspberry Pi (V8) 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 conditions correctly. A local privileged
attacker could use this to cause a denial of service (system crash).
(CVE-2020-12770)

It was discovered that the USB Gadget device driver in the Linux kernel did
not validate...

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 conditions correctly. A local privileged
attacker could use this to cause a denial of service (system crash).
(CVE-2020-12770)

It was discovered that the USB Gadget device driver in the Linux kernel did
not validate arguments passed from configfs in some situations. A local
attacker could possibly use this to cause a denial of service (system
crash) or possibly expose sensitive information. (CVE-2020-13143)

It was discovered that the KVM implementation in the Linux kernel did not
properly deallocate memory on initialization for some processors. A local
attacker could possibly use this to cause a denial of service.
(CVE-2020-12768)

Update instructions

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

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
20.04 focal linux-image-5.4.0-1013-raspi –  5.4.0-1013.13
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-5.4.0-1020-azure –  5.4.0-1020.20
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-azure –  5.4.0.1020.19
linux-image-gcp –  5.4.0.1019.17
linux-image-generic –  5.4.0.40.43
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-raspi –  5.4.0.1013.13
linux-image-raspi2 –  5.4.0.1013.13
linux-image-virtual –  5.4.0.40.43

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Get Ubuntu Pro

References

Have additional questions?

Talk to a member of the team ›