1. Ubuntu Security Notices
  2. USN-4412-1

USN-4412-1: 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-aws-5.3 - Linux kernel for Amazon Web Services (AWS) systems
  • linux-azure - Linux kernel for Microsoft Azure Cloud systems
  • linux-azure-5.3 - Linux kernel for Microsoft Azure Cloud systems
  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gcp-5.3 - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-gke-5.3 - Linux kernel for Google Container Engine (GKE) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel
  • linux-kvm - Linux kernel for cloud environments
  • linux-oracle - Linux kernel for Oracle Cloud systems
  • linux-oracle-5.3 - Linux kernel for Oracle Cloud systems
  • linux-raspi2-5.3 - Linux kernel for Raspberry Pi (V7) systems

Details

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)

Dmitry Vyukov discovered that the SELinux netlink...

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)

Dmitry Vyukov discovered that the SELinux netlink security hook in the
Linux kernel did not validate messages in some situations. A privileged
attacker could use this to bypass SELinux netlink restrictions.
(CVE-2020-10751)

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
19.10 eoan linux-image-5.3.0-1024-kvm –  5.3.0-1024.26
linux-image-5.3.0-1028-oracle –  5.3.0-1028.30
linux-image-5.3.0-1030-aws –  5.3.0-1030.32
linux-image-5.3.0-1030-gcp –  5.3.0-1030.32
linux-image-5.3.0-1032-azure –  5.3.0-1032.33
linux-image-5.3.0-62-generic –  5.3.0-62.56
linux-image-5.3.0-62-generic-lpae –  5.3.0-62.56
linux-image-5.3.0-62-lowlatency –  5.3.0-62.56
linux-image-5.3.0-62-snapdragon –  5.3.0-62.56
linux-image-aws –  5.3.0.1030.40
linux-image-azure –  5.3.0.1032.50
linux-image-gcp –  5.3.0.1030.40
linux-image-generic –  5.3.0.62.52
linux-image-generic-lpae –  5.3.0.62.52
linux-image-gke –  5.3.0.1030.40
linux-image-kvm –  5.3.0.1024.22
linux-image-lowlatency –  5.3.0.62.52
linux-image-oracle –  5.3.0.1028.43
linux-image-snapdragon –  5.3.0.62.52
linux-image-virtual –  5.3.0.62.52
18.04 bionic linux-image-5.3.0-1028-oracle –  5.3.0-1028.30~18.04.1
linux-image-5.3.0-1028-raspi2 –  5.3.0-1028.30~18.04.2
linux-image-5.3.0-1030-aws –  5.3.0-1030.32~18.04.1
linux-image-5.3.0-1030-gcp –  5.3.0-1030.32~18.04.1
linux-image-5.3.0-1030-gke –  5.3.0-1030.32~18.04.1
linux-image-5.3.0-1032-azure –  5.3.0-1032.33~18.04.1
linux-image-5.3.0-62-generic –  5.3.0-62.56~18.04.1
linux-image-5.3.0-62-generic-lpae –  5.3.0-62.56~18.04.1
linux-image-5.3.0-62-lowlatency –  5.3.0-62.56~18.04.1
linux-image-aws –  5.3.0.1030.28
linux-image-azure –  5.3.0.1032.28
linux-image-gcp –  5.3.0.1030.24
linux-image-generic-hwe-18.04 –  5.3.0.62.115
linux-image-generic-lpae-hwe-18.04 –  5.3.0.62.115
linux-image-gke-5.3 –  5.3.0.1030.15
linux-image-gkeop-5.3 –  5.3.0.62.115
linux-image-lowlatency-hwe-18.04 –  5.3.0.62.115
linux-image-oracle –  5.3.0.1028.25
linux-image-raspi2-hwe-18.04 –  5.3.0.1028.17
linux-image-snapdragon-hwe-18.04 –  5.3.0.62.115
linux-image-virtual-hwe-18.04 –  5.3.0.62.115

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References

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