1. Ubuntu Security Notices
  2. USN-4525-1

USN-4525-1: Linux kernel vulnerabilities

Publication date

24 September 2020

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the AMD Cryptographic Coprocessor device driver in
the Linux kernel did not properly deallocate memory in some situations. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-18808)

It was discovered that the Conexant 23885 TV card device driver for the
Linux kernel did not properly deallocate memory in some error conditions. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-19054)

It was discovered that the VFIO PCI driver in the Linux kernel did not
properly handle attempts to access disabled memory spaces. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2020-12888)

It was discovered that the state of network RNG in the Linux kernel was
potentially observable. A...

It was discovered that the AMD Cryptographic Coprocessor device driver in
the Linux kernel did not properly deallocate memory in some situations. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-18808)

It was discovered that the Conexant 23885 TV card device driver for the
Linux kernel did not properly deallocate memory in some error conditions. A
local attacker could use this to cause a denial of service (memory
exhaustion). (CVE-2019-19054)

It was discovered that the VFIO PCI driver in the Linux kernel did not
properly handle attempts to access disabled memory spaces. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2020-12888)

It was discovered that the state of network RNG in the Linux kernel was
potentially observable. A remote attacker could use this to expose
sensitive information. (CVE-2020-16166)

It was discovered that the NFS client implementation in the Linux kernel
did not properly perform bounds checking before copying security labels in
some situations. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)

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-5.4.0-1019-raspi –  5.4.0-1019.21
linux-image-5.4.0-1024-kvm –  5.4.0-1024.24
linux-image-5.4.0-1025-aws –  5.4.0-1025.25
linux-image-5.4.0-1025-gcp –  5.4.0-1025.25
linux-image-5.4.0-1025-oracle –  5.4.0-1025.25
linux-image-5.4.0-1026-azure –  5.4.0-1026.26
linux-image-5.4.0-48-generic –  5.4.0-48.52
linux-image-5.4.0-48-generic-lpae –  5.4.0-48.52
linux-image-5.4.0-48-lowlatency –  5.4.0-48.52
linux-image-aws –  5.4.0.1025.26
linux-image-azure –  5.4.0.1026.25
linux-image-gcp –  5.4.0.1025.22
linux-image-generic –  5.4.0.48.51
linux-image-generic-lpae –  5.4.0.48.51
linux-image-gke –  5.4.0.1025.22
linux-image-kvm –  5.4.0.1024.22
linux-image-lowlatency –  5.4.0.48.51
linux-image-oem –  5.4.0.48.51
linux-image-oem-osp1 –  5.4.0.48.51
linux-image-oracle –  5.4.0.1025.22
linux-image-raspi –  5.4.0.1019.54
linux-image-raspi2 –  5.4.0.1019.54
linux-image-virtual –  5.4.0.48.51
18.04 bionic linux-image-5.4.0-1019-raspi –  5.4.0-1019.21~18.04.1
linux-image-5.4.0-1025-aws –  5.4.0-1025.25~18.04.1
linux-image-5.4.0-1025-gcp –  5.4.0-1025.25~18.04.1
linux-image-5.4.0-1025-oracle –  5.4.0-1025.25~18.04.1
linux-image-5.4.0-1026-azure –  5.4.0-1026.26~18.04.1
linux-image-5.4.0-48-generic –  5.4.0-48.52~18.04.1
linux-image-5.4.0-48-generic-lpae –  5.4.0-48.52~18.04.1
linux-image-5.4.0-48-lowlatency –  5.4.0-48.52~18.04.1
linux-image-aws –  5.4.0.1025.10
linux-image-azure –  5.4.0.1026.9
linux-image-gcp –  5.4.0.1025.13
linux-image-generic-hwe-18.04 –  5.4.0.48.52~18.04.42
linux-image-generic-lpae-hwe-18.04 –  5.4.0.48.52~18.04.42
linux-image-lowlatency-hwe-18.04 –  5.4.0.48.52~18.04.42
linux-image-oracle –  5.4.0.1025.9
linux-image-raspi-hwe-18.04 –  5.4.0.1019.23
linux-image-snapdragon-hwe-18.04 –  5.4.0.48.52~18.04.42
linux-image-virtual-hwe-18.04 –  5.4.0.48.52~18.04.42

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 ›