USN-4076-1: Linux kernel vulnerabilities

25 July 2019

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-kvm - Linux kernel for cloud environments
  • linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

It was discovered that a race condition existed in the Serial Attached SCSI
(SAS) implementation in the Linux kernel. A local attacker could possibly
use this to cause a denial of service (system crash) or execute arbitrary
code. (CVE-2018-20836)

It was discovered that the ext4 file system implementation in the Linux
kernel did not properly zero out memory in some situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2019-11833)

It was discovered that the Bluetooth Human Interface Device Protocol (HIDP)
implementation in the Linux kernel did not properly verify strings were
NULL terminated in certain situations. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2019-11884)

It was discovered that the Linux kernel on ARM processors allowed a tracing
process to modify a syscall after a seccomp decision had been made on that
syscall. A local attacker could possibly use this to bypass seccomp
restrictions. (CVE-2019-2054)

Hugues Anguelkov discovered that the Broadcom Wifi driver in the Linux
kernel did not properly prevent remote firmware events from being processed
for USB Wifi devices. A physically proximate attacker could use this to
send firmware events to the device. (CVE-2019-9503)

It was discovered that an integer overflow existed in the Freescale
(PowerPC) hypervisor manager in the Linux kernel. A local attacker with
write access to /dev/fsl-hv could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-10142)

Update instructions

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

Ubuntu 16.04

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.

Related notices

  • USN-4069-1: linux-image-5.0.0-1017-snapdragon, linux-image-5.0.0-21-generic-lpae, linux-image-snapdragon, linux-image-azure, linux-image-generic, linux-image-aws, linux-image-5.0.0-21-lowlatency, linux-image-5.0.0-21-generic, linux-image-raspi2, linux-aws, linux-snapdragon, linux-image-kvm, linux-image-5.0.0-1011-aws, linux-image-5.0.0-1013-raspi2, linux-azure, linux-raspi2, linux-image-5.0.0-1012-azure, linux-image-gcp, linux-image-5.0.0-1011-kvm, linux-image-generic-lpae, linux, linux-image-gke, linux-image-5.0.0-1011-gcp, linux-image-virtual, linux-gcp, linux-kvm, linux-image-lowlatency
  • USN-3980-1: linux-image-4.18.0-1012-kvm, linux-image-snapdragon, linux-image-azure, linux-image-powerpc64-smp, linux-image-generic, linux-image-aws, linux-image-4.18.0-1014-raspi2, linux-image-4.18.0-20-lowlatency, linux-image-lowlatency, linux-image-raspi2, linux-aws, linux-image-kvm, linux-image-4.18.0-1018-azure, linux-azure, linux-image-4.18.0-1011-gcp, linux-raspi2, linux-image-gcp, linux-image-generic-lpae, linux, linux-image-powerpc64-emb, linux-image-4.18.0-1016-aws, linux-image-powerpc-e500mc, linux-image-gke, linux-image-powerpc-smp, linux-image-virtual, linux-gcp, linux-kvm, linux-image-4.18.0-20-generic-lpae, linux-image-4.18.0-20-generic, linux-image-4.18.0-20-snapdragon
  • USN-4069-2: linux-hwe, linux-image-5.0.0-23-lowlatency, linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-5.0.0-23-generic-lpae, linux-image-5.0.0-23-generic, linux-image-generic-hwe-18.04, linux-image-lowlatency-hwe-18.04
  • USN-4095-1: linux-image-snapdragon, linux-image-4.4.0-159-generic-lpae, linux-image-4.4.0-1054-kvm, linux-image-powerpc64-smp, linux-image-generic, linux-image-aws, linux-image-4.4.0-159-powerpc-e500mc, linux-image-raspi2, linux-aws, linux-snapdragon, linux-image-4.4.0-159-generic, linux-image-kvm, linux-image-4.4.0-159-powerpc-smp, linux-raspi2, linux-image-4.4.0-1118-raspi2, linux-image-4.4.0-1090-aws, linux-image-generic-lpae, linux-image-4.4.0-159-lowlatency, linux, linux-image-4.4.0-1122-snapdragon, linux-image-powerpc64-emb, linux-image-powerpc-e500mc, linux-image-4.4.0-159-powerpc64-emb, linux-image-powerpc-smp, linux-image-virtual, linux-image-4.4.0-159-powerpc64-smp, linux-kvm, linux-image-lowlatency
  • USN-4068-1: linux-image-4.15.0-1037-gcp, linux-image-4.15.0-55-generic-lpae, linux-image-4.15.0-1018-oracle, linux-image-snapdragon, linux-image-powerpc64-smp, linux-image-generic, linux-image-aws, linux-image-4.15.0-1041-raspi2, linux-image-raspi2, linux-aws, linux-snapdragon, linux-image-kvm, linux-raspi2, linux-image-gcp, linux-image-generic-lpae, linux-image-4.15.0-1044-aws, linux-image-4.15.0-55-lowlatency, linux-image-4.15.0-55-generic, linux, linux-image-4.15.0-1058-snapdragon, linux-image-powerpc64-emb, linux-image-4.15.0-1039-kvm, linux-oracle, linux-image-powerpc-e500mc, linux-image-powerpc-smp, linux-image-virtual, linux-image-oracle, linux-gcp, linux-kvm, linux-image-lowlatency
  • USN-4068-2: linux-hwe, linux-image-generic-hwe-16.04, linux-image-4.15.0-55-lowlatency, linux-image-4.15.0-1037-gcp, linux-image-4.15.0-55-generic-lpae, linux-image-lowlatency-hwe-16.04, linux-image-virtual-hwe-16.04, linux-gcp, linux-image-4.15.0-55-generic, linux-image-generic-lpae-hwe-16.04, linux-image-gke, linux-image-oem, linux-image-gcp
  • USN-3981-1: linux-image-4.15.0-1013-oracle, linux-image-4.15.0-50-generic, linux-image-4.15.0-1034-kvm, linux-oem, linux-image-snapdragon, linux-image-powerpc64-smp, linux-image-generic, linux-image-4.15.0-50-snapdragon, linux-image-aws, linux-image-4.15.0-1039-aws, linux-image-raspi2, linux-image-4.15.0-1053-snapdragon, linux-aws, linux-snapdragon, linux-image-kvm, linux-image-4.15.0-1032-gcp, linux-raspi2, linux-image-gcp, linux-image-4.15.0-1036-raspi2, linux-image-generic-lpae, linux, linux-image-4.15.0-50-lowlatency, linux-image-powerpc64-emb, linux-oracle, linux-image-powerpc-e500mc, linux-image-powerpc-smp, linux-image-virtual, linux-image-oracle, linux-image-4.15.0-50-generic-lpae, linux-gcp, linux-image-4.15.0-1038-oem, linux-kvm, linux-image-lowlatency, linux-image-oem
  • USN-3979-1: linux-image-azure, linux-image-generic, linux-image-aws, linux-image-5.0.0-1006-azure, linux-image-raspi2, linux-aws, linux-image-kvm, linux-azure, linux-image-5.0.0-15-lowlatency, linux-raspi2, linux-image-gcp, linux-image-5.0.0-1006-aws, linux-image-generic-lpae, linux-image-5.0.0-1006-kvm, linux-image-5.0.0-15-generic-lpae, linux, linux-image-5.0.0-1006-gcp, linux-image-5.0.0-15-generic, linux-image-gke, linux-image-virtual, linux-gcp, linux-kvm, linux-image-lowlatency, linux-image-5.0.0-1008-raspi2
  • USN-4118-1: linux-image-4.15.0-1047-aws, linux-aws, linux-image-aws-hwe, linux-image-aws, linux-aws-hwe
  • USN-4095-2: linux-image-4.4.0-159-generic-lpae, linux-image-virtual-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-aws, linux-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-159-powerpc-e500mc, linux-aws, linux-image-4.4.0-159-generic, linux-image-4.4.0-159-powerpc-smp, linux-image-powerpc-smp-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-generic-lts-xenial, linux-image-4.4.0-159-lowlatency, linux-image-4.4.0-159-powerpc64-emb, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-159-powerpc64-smp, linux-image-4.4.0-1050-aws
  • USN-3981-2: linux-image-4.15.0-1013-oracle, linux-image-4.15.0-50-generic, linux-image-4.15.0-1045-azure, linux-image-azure, linux-image-generic-hwe-16.04, linux-image-4.15.0-1032-gcp, linux-azure, linux-image-generic-lpae-hwe-16.04, linux-image-gcp, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-50-lowlatency, linux-oracle, linux-image-gke, linux-hwe, linux-image-oracle, linux-image-4.15.0-50-generic-lpae, linux-image-virtual-hwe-16.04, linux-gcp, linux-image-oem
  • USN-3980-2: linux-hwe, linux-image-4.18.0-20-lowlatency, linux-image-snapdragon-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-generic-lpae-hwe-18.04, linux-image-azure, linux-image-4.18.0-1018-azure, linux-image-4.18.0-20-generic-lpae, linux-image-4.18.0-20-generic, linux-azure, linux-image-generic-hwe-18.04, linux-image-4.18.0-20-snapdragon, linux-image-lowlatency-hwe-18.04