USN-4008-1: Linux kernel vulnerabilities

USN-4008-1: 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

Robert Święcki discovered that the Linux kernel did not properly apply
Address Space Layout Randomization (ASLR) in some situations for setuid elf
binaries. A local attacker could use this to improve the chances of
exploiting an existing vulnerability in a setuid elf binary.
(CVE-2019-11190)

It was discovered that a null pointer dereference vulnerability existed in
the LSI Logic MegaRAID driver in the Linux kernel. A local attacker could
use this to cause a denial of service (system crash). (CVE-2019-11810)

It was discovered that a race condition leading to a use-after-free existed
in the Reliable Datagram Sockets (RDS) protocol implementation in the Linux
kernel. The RDS protocol is blacklisted by default in Ubuntu. If enabled, a
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2019-11815)

Federico Manuel Bento discovered that the Linux kernel did not properly
apply Address Space Layout Randomization (ASLR) in some situations for
setuid a.out binaries. A local attacker could use this to improve the
chances of exploiting an existing vulnerability in a setuid a.out binary.
(CVE-2019-11191)

As a hardening measure, this update disables a.out support.

Update instructions

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

Ubuntu 16.04 LTS

linux-image-4.4.0-1047-kvm – 4.4.0-1047.53

linux-image-4.4.0-1084-aws – 4.4.0-1084.94

linux-image-4.4.0-1110-raspi2 – 4.4.0-1110.118

linux-image-4.4.0-1114-snapdragon – 4.4.0-1114.119

linux-image-4.4.0-150-generic – 4.4.0-150.176

linux-image-4.4.0-150-generic-lpae – 4.4.0-150.176

linux-image-4.4.0-150-lowlatency – 4.4.0-150.176

linux-image-4.4.0-150-powerpc-e500mc – 4.4.0-150.176

linux-image-4.4.0-150-powerpc-smp – 4.4.0-150.176

linux-image-4.4.0-150-powerpc64-emb – 4.4.0-150.176

linux-image-4.4.0-150-powerpc64-smp – 4.4.0-150.176

linux-image-aws – 4.4.0.1084.87

linux-image-generic – 4.4.0.150.158

linux-image-generic-lpae – 4.4.0.150.158

linux-image-kvm – 4.4.0.1047.47

linux-image-lowlatency – 4.4.0.150.158

linux-image-powerpc-e500mc – 4.4.0.150.158

linux-image-powerpc-smp – 4.4.0.150.158

linux-image-powerpc64-emb – 4.4.0.150.158

linux-image-powerpc64-smp – 4.4.0.150.158

linux-image-raspi2 – 4.4.0.1110.110

linux-image-snapdragon – 4.4.0.1114.106

linux-image-virtual – 4.4.0.150.158

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

• CVE-2019-11190
• CVE-2019-11191
• CVE-2019-11810
• CVE-2019-11815

Source: USN-4008-1: Linux kernel vulnerabilities