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.
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