USN-3848-1: 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 double free existed in the AMD GPIO driver in the
Linux kernel. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2017-18174)
It was discovered that an integer overrun vulnerability existed in the
POSIX timers implementation in the Linux kernel. A local attacker could use
this to cause a denial of service. (CVE-2018-12896)
Kanda Motohiro discovered that writing extended attributes to an XFS file
system in the Linux kernel in certain situations could cause an error
condition to occur. A local attacker could use this to cause a denial of
service. (CVE-2018-18690)
It was discovered that an integer overflow vulnerability existed in the
CDROM driver of the Linux kernel. A local attacker could use this to expose
sensitive information (kernel memory). (CVE-2018-18710)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 16.04 LTS
- linux-image-4.4.0-1039-kvm – 4.4.0-1039.45
- linux-image-4.4.0-1074-aws – 4.4.0-1074.84
- linux-image-4.4.0-1102-raspi2 – 4.4.0-1102.110
- linux-image-4.4.0-1106-snapdragon – 4.4.0-1106.111
- linux-image-4.4.0-141-generic – 4.4.0-141.167
- linux-image-4.4.0-141-generic-lpae – 4.4.0-141.167
- linux-image-4.4.0-141-lowlatency – 4.4.0-141.167
- linux-image-4.4.0-141-powerpc-e500mc – 4.4.0-141.167
- linux-image-4.4.0-141-powerpc-smp – 4.4.0-141.167
- linux-image-4.4.0-141-powerpc64-emb – 4.4.0-141.167
- linux-image-4.4.0-141-powerpc64-smp – 4.4.0-141.167
- linux-image-aws – 4.4.0.1074.76
- linux-image-generic – 4.4.0.141.147
- linux-image-generic-lpae – 4.4.0.141.147
- linux-image-kvm – 4.4.0.1039.38
- linux-image-lowlatency – 4.4.0.141.147
- linux-image-powerpc-e500mc – 4.4.0.141.147
- linux-image-powerpc-smp – 4.4.0.141.147
- linux-image-powerpc64-emb – 4.4.0.141.147
- linux-image-powerpc64-smp – 4.4.0.141.147
- linux-image-raspi2 – 4.4.0.1102.102
- linux-image-snapdragon – 4.4.0.1106.98
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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