Ubuntu 16.04 LTS, USN-4419-1 Critical: Linux Kernel Denial of Service Risks

ubuntu

July 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-kvm: Linux kernel for cloud environments

- linux-raspi2: Linux kernel for Raspberry Pi (V7) systems

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

It was discovered that a race condition existed in the Precision Time

Protocol (PTP) implementation in the Linux kernel, leading to a use-after-

free vulnerability. A local attacker could possibly use this to cause a

denial of service (system crash) or possibly execute arbitrary code.

(CVE-2020-10690)

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 discover...

Read the Full Advisory

Topics Covered

security advisory denial of service kernel ubuntu system crash privacy exposure

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1076-kvm      4.4.0-1076.83
  linux-image-4.4.0-1110-aws      4.4.0-1110.121
  linux-image-4.4.0-1135-raspi2   4.4.0-1135.144
  linux-image-4.4.0-1139-snapdragon  4.4.0-1139.147
  linux-image-4.4.0-185-generic   4.4.0-185.215
  linux-image-4.4.0-185-generic-lpae  4.4.0-185.215
  linux-image-4.4.0-185-lowlatency  4.4.0-185.215
  linux-image-4.4.0-185-powerpc-e500mc  4.4.0-185.215
  linux-image-4.4.0-185-powerpc-smp  4.4.0-185.215
  linux-image-4.4.0-185-powerpc64-emb  4.4.0-185.215
  linux-image-4.4.0-185-powerpc64-smp  4.4.0-185.215
  linux-image-aws                 4.4.0.1110.114
  linux-image-generic             4.4.0.185.191
  linux-image-generic-lpae        4.4.0.185.191
  linux-image-kvm                 4.4.0.1076.74
  linux-image-lowlatency          4.4.0.185.191
  linux-image-powerpc-e500mc      4.4.0.185.191
  linux-image-powerpc-smp         4.4.0.185.191
  linux-image-powerpc64-emb       4.4.0.185.191
  linux-image-powerpc64-smp       4.4.0.185.191
  linux-image-raspi2              4.4.0.1135.135
  linux-image-snapdragon          4.4.0.1139.131
  linux-image-virtual             4.4.0.185.191

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1074-aws      4.4.0-1074.78
  linux-image-4.4.0-185-generic   4.4.0-185.215~14.04.1
  linux-image-4.4.0-185-generic-lpae  4.4.0-185.215~14.04.1
  linux-image-4.4.0-185-lowlatency  4.4.0-185.215~14.04.1
  linux-image-4.4.0-185-powerpc-e500mc  4.4.0-185.215~14.04.1
  linux-image-4.4.0-185-powerpc-smp  4.4.0-185.215~14.04.1
  linux-image-4.4.0-185-powerpc64-emb  4.4.0-185.215~14.04.1
  linux-image-4.4.0-185-powerpc64-smp  4.4.0-185.215~14.04.1
  linux-image-aws                 4.4.0.1074.71
  linux-image-generic-lpae-lts-xenial  4.4.0.185.162
  linux-image-generic-lts-xenial  4.4.0.185.162
  linux-image-lowlatency-lts-xenial  4.4.0.185.162
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.185.162
  linux-image-powerpc-smp-lts-xenial  4.4.0.185.162
  linux-image-powerpc64-emb-lts-xenial  4.4.0.185.162
  linux-image-powerpc64-smp-lts-xenial  4.4.0.185.162
  linux-image-virtual-lts-xenial  4.4.0.185.162

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.