USN-4116-1: Linux kernel vulnerabilities

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon 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
linux-snapdragon – Linux kernel for Snapdragon processors

Details

It was discovered that a use-after-free error existed in the block layer
subsystem of the Linux kernel when certain failure conditions occurred. A
local attacker could possibly use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2018-20856)

Amit Klein and Benny Pinkas discovered that the Linux kernel did not
sufficiently randomize IP ID values generated for connectionless networking
protocols. A remote attacker could use this to track particular Linux
devices. (CVE-2019-10638)

Praveen Pandey discovered that the Linux kernel did not properly validate
sent signals in some situations on PowerPC systems with transactional
memory disabled. A local attacker could use this to cause a denial of
service. (CVE-2019-13648)

It was discovered that the floppy driver in the Linux kernel did not
properly validate meta data, leading to a buffer overread. A local attacker
could use this to cause a denial of service (system crash).
(CVE-2019-14283)

It was discovered that the floppy driver in the Linux kernel did not
properly validate ioctl() calls, leading to a division-by-zero. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2019-14284)

Jason Wang discovered that an infinite loop vulnerability existed in the
virtio net driver in the Linux kernel. A local attacker in a guest VM could
possibly use this to cause a denial of service in the host system.
(CVE-2019-3900)

Update instructions

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

Ubuntu 16.04 LTS: linux-image-4.4.0-1056-kvm – 4.4.0-1056.63; linux-image-4.4.0-1092-aws – 4.4.0-1092.103; linux-image-4.4.0-1120-raspi2 – 4.4.0-1120.129; linux-image-4.4.0-1124-snapdragon – 4.4.0-1124.130; linux-image-4.4.0-161-generic – 4.4.0-161.189; linux-image-4.4.0-161-generic-lpae – 4.4.0-161.189; linux-image-4.4.0-161-lowlatency – 4.4.0-161.189; linux-image-4.4.0-161-powerpc-e500mc – 4.4.0-161.189; linux-image-4.4.0-161-powerpc-smp – 4.4.0-161.189; linux-image-4.4.0-161-powerpc64-emb – 4.4.0-161.189; linux-image-4.4.0-161-powerpc64-smp – 4.4.0-161.189; linux-image-aws – 4.4.0.1092.96; linux-image-generic – 4.4.0.161.169; linux-image-generic-lpae – 4.4.0.161.169; linux-image-kvm – 4.4.0.1056.56; linux-image-lowlatency – 4.4.0.161.169; linux-image-powerpc-e500mc – 4.4.0.161.169; linux-image-powerpc-smp – 4.4.0.161.169; linux-image-powerpc64-emb – 4.4.0.161.169; linux-image-powerpc64-smp – 4.4.0.161.169; linux-image-raspi2 – 4.4.0.1120.120; linux-image-snapdragon – 4.4.0.1124.116; linux-image-virtual – 4.4.0.161.169

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-4116-1: Linux kernel vulnerabilities

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