USN-4076-1: Linux kernel vulnerabilities

linux, linux-aws, linux-kvm, linux-raspi2 vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

Ubuntu 16.04 LTS

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 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 LTS: linux-image-4.4.0-1052-kvm – 4.4.0-1052.59; linux-image-4.4.0-1088-aws – 4.4.0-1088.99; linux-image-4.4.0-1117-raspi2 – 4.4.0-1117.126; linux-image-4.4.0-157-generic – 4.4.0-157.185; linux-image-4.4.0-157-generic-lpae – 4.4.0-157.185; linux-image-4.4.0-157-lowlatency – 4.4.0-157.185; linux-image-4.4.0-157-powerpc-e500mc – 4.4.0-157.185; linux-image-4.4.0-157-powerpc-smp – 4.4.0-157.185; linux-image-4.4.0-157-powerpc64-emb – 4.4.0-157.185; linux-image-4.4.0-157-powerpc64-smp – 4.4.0-157.185; linux-image-aws – 4.4.0.1088.91; linux-image-generic – 4.4.0.157.165; linux-image-generic-lpae – 4.4.0.157.165; linux-image-kvm – 4.4.0.1052.52; linux-image-lowlatency – 4.4.0.157.165; linux-image-powerpc-e500mc – 4.4.0.157.165; linux-image-powerpc-smp – 4.4.0.157.165; linux-image-powerpc64-emb – 4.4.0.157.165; linux-image-powerpc64-smp – 4.4.0.157.165; linux-image-raspi2 – 4.4.0.1117.117; linux-image-virtual – 4.4.0.157.165

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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.

References

Source: USN-4076-1: Linux kernel vulnerabilities

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