Ubuntu: 4319-1 Moderate: Kernel Denial Of Service Threats

ubuntu

April 6, 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-raspi2: Linux kernel for Raspberry Pi 2

- linux-gcp-5.3: Linux kernel for Google Cloud Platform (GCP) systems

- linux-hwe: Linux hardware enablement (HWE) kernel

- linux-oracle-5.3: Linux kernel Oracle Cloud systems

- linux-raspi2-5.3: Linux kernel for Raspberry Pi 2

Details:

It was discovered that the IPMI message handler implementation in the Linux

kernel did not properly deallocate memory in certain situations. A local

attacker could use this to cause a denial of service (kernel memory

exhaustion). (CVE-2019-19046)

Al Viro discovered that the vfs layer in the Linux kernel contained a use-

after-free vulnerability. A local attacker could use...

Read the Full Advisory

Topics Covered

security advisory denial of service Ubuntu kernel system crash

Update Instructions

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

Ubuntu 19.10:
  linux-image-5.3.0-1014-oracle   5.3.0-1014.15
  linux-image-5.3.0-1015-kvm      5.3.0-1015.16
  linux-image-5.3.0-1016-aws      5.3.0-1016.17
  linux-image-5.3.0-1017-gcp      5.3.0-1017.18
  linux-image-5.3.0-1022-raspi2   5.3.0-1022.24
  linux-image-5.3.0-46-generic    5.3.0-46.38
  linux-image-5.3.0-46-generic-lpae  5.3.0-46.38
  linux-image-5.3.0-46-lowlatency  5.3.0-46.38
  linux-image-5.3.0-46-snapdragon  5.3.0-46.38
  linux-image-aws                 5.3.0.1016.18
  linux-image-gcp                 5.3.0.1017.18
  linux-image-generic             5.3.0.46.39
  linux-image-generic-lpae        5.3.0.46.39
  linux-image-gke                 5.3.0.1017.18
  linux-image-kvm                 5.3.0.1015.17
  linux-image-lowlatency          5.3.0.46.39
  linux-image-oracle              5.3.0.1014.15
  linux-image-raspi2              5.3.0.1022.19
  linux-image-snapdragon          5.3.0.46.39
  linux-image-virtual             5.3.0.46.39

Ubuntu 18.04 LTS:
  linux-image-5.3.0-1014-oracle   5.3.0-1014.15~18.04.1
  linux-image-5.3.0-1017-gcp      5.3.0-1017.18~18.04.1
  linux-image-5.3.0-1022-raspi2   5.3.0-1022.24~18.04.1
  linux-image-5.3.0-46-generic    5.3.0-46.38~18.04.1
  linux-image-5.3.0-46-generic-lpae  5.3.0-46.38~18.04.1
  linux-image-5.3.0-46-lowlatency  5.3.0-46.38~18.04.1
  linux-image-gcp-edge            5.3.0.1017.16
  linux-image-generic-hwe-18.04   5.3.0.46.102
  linux-image-generic-lpae-hwe-18.04  5.3.0.46.102
  linux-image-lowlatency-hwe-18.04  5.3.0.46.102
  linux-image-oracle-edge         5.3.0.1014.13
  linux-image-raspi2-hwe-18.04    5.3.0.1022.11
  linux-image-snapdragon-hwe-18.04  5.3.0.46.102
  linux-image-virtual-hwe-18.04   5.3.0.46.102

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.