Ubuntu 16.04 LTS USN-4876-1 Critical: Kernel Denial Of Service

ubuntu

March 16, 2021

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 (V8) systems

- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors

- linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty

Details:

Olivier Benjamin and Pawel Wieczorkiewicz discovered a race condition the

Xen paravirt block backend in the Linux kernel, leading to a use-after-free

vulnerability. An attacker in a guest VM could use this to cause a denial

of service in the host OS. (CVE-2020-29569)

It was discovered that the Marvell WiFi-Ex device driver in the Linux

kernel did not properly validate ad-hoc SSIDs. A local attacker could use

this to cause a denial of service (system crash) or possibly execute

arbitrary code. (CVE-2020-36158)

吴异 discovered that the NF...

Read the Full Advisory

Topics Covered

security advisory DoS kernel system crash access restriction AWS Ubuntu 16.04

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.4.0-1089-kvm      4.4.0-1089.98
  linux-image-4.4.0-1123-aws      4.4.0-1123.137
  linux-image-4.4.0-1147-raspi2   4.4.0-1147.157
  linux-image-4.4.0-1151-snapdragon  4.4.0-1151.161
  linux-image-4.4.0-204-generic   4.4.0-204.236
  linux-image-4.4.0-204-generic-lpae  4.4.0-204.236
  linux-image-4.4.0-204-lowlatency  4.4.0-204.236
  linux-image-4.4.0-204-powerpc-e500mc  4.4.0-204.236
  linux-image-4.4.0-204-powerpc-smp  4.4.0-204.236
  linux-image-4.4.0-204-powerpc64-emb  4.4.0-204.236
  linux-image-4.4.0-204-powerpc64-smp  4.4.0-204.236
  linux-image-aws                 4.4.0.1123.128
  linux-image-generic             4.4.0.204.210
  linux-image-generic-lpae        4.4.0.204.210
  linux-image-kvm                 4.4.0.1089.87
  linux-image-lowlatency          4.4.0.204.210
  linux-image-powerpc-e500mc      4.4.0.204.210
  linux-image-powerpc-smp         4.4.0.204.210
  linux-image-powerpc64-emb       4.4.0.204.210
  linux-image-powerpc64-smp       4.4.0.204.210
  linux-image-raspi2              4.4.0.1147.147
  linux-image-snapdragon          4.4.0.1151.143
  linux-image-virtual             4.4.0.204.210

Ubuntu 14.04 ESM:
  linux-image-4.4.0-1087-aws      4.4.0-1087.91
  linux-image-4.4.0-204-generic   4.4.0-204.236~14.04.1
  linux-image-4.4.0-204-generic-lpae  4.4.0-204.236~14.04.1
  linux-image-4.4.0-204-lowlatency  4.4.0-204.236~14.04.1
  linux-image-4.4.0-204-powerpc-e500mc  4.4.0-204.236~14.04.1
  linux-image-4.4.0-204-powerpc-smp  4.4.0-204.236~14.04.1
  linux-image-4.4.0-204-powerpc64-emb  4.4.0-204.236~14.04.1
  linux-image-4.4.0-204-powerpc64-smp  4.4.0-204.236~14.04.1
  linux-image-aws                 4.4.0.1087.84
  linux-image-generic-lpae-lts-xenial  4.4.0.204.178
  linux-image-generic-lts-xenial  4.4.0.204.178
  linux-image-lowlatency-lts-xenial  4.4.0.204.178
  linux-image-powerpc-e500mc-lts-xenial  4.4.0.204.178
  linux-image-powerpc-smp-lts-xenial  4.4.0.204.178
  linux-image-powerpc64-emb-lts-xenial  4.4.0.204.178
  linux-image-powerpc64-smp-lts-xenial  4.4.0.204.178
  linux-image-virtual-lts-xenial  4.4.0.204.178

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.