USN-3847-1: Linux kernel vulnerabilities
linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 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-azure – Linux kernel for Microsoft Azure Cloud systems
- linux-gcp – Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm – Linux kernel for cloud environments
- linux-oem – Linux kernel for OEM processors
- linux-raspi2 – Linux kernel for Raspberry Pi 2
Details
It was discovered that a race condition existed in the raw MIDI driver for
the Linux kernel, leading to a double free vulnerability. A local attacker
could use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2018-10902)
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)
Noam Rathaus discovered that a use-after-free vulnerability existed in the
Infiniband implementation in the Linux kernel. An attacker could use this
to cause a denial of service (system crash). (CVE-2018-14734)
It was discovered that the YUREX USB device driver for the Linux kernel did
not properly restrict user space reads or writes. A physically proximate
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2018-16276)
It was discovered that the BPF verifier in the Linux kernel did not
correctly compute numeric bounds in some situations. A local attacker could
use this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2018-18445)
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 18.04 LTS
- linux-image-4.15.0-1026-gcp – 4.15.0-1026.27
- linux-image-4.15.0-1028-kvm – 4.15.0-1028.28
- linux-image-4.15.0-1030-oem – 4.15.0-1030.35
- linux-image-4.15.0-1030-raspi2 – 4.15.0-1030.32
- linux-image-4.15.0-1031-aws – 4.15.0-1031.33
- linux-image-4.15.0-1036-azure – 4.15.0-1036.38
- linux-image-4.15.0-43-generic – 4.15.0-43.46
- linux-image-4.15.0-43-generic-lpae – 4.15.0-43.46
- linux-image-4.15.0-43-lowlatency – 4.15.0-43.46
- linux-image-4.15.0-43-snapdragon – 4.15.0-43.46
- linux-image-aws – 4.15.0.1031.30
- linux-image-azure – 4.15.0.1036.36
- linux-image-gcp – 4.15.0.1026.28
- linux-image-generic – 4.15.0.43.45
- linux-image-generic-lpae – 4.15.0.43.45
- linux-image-gke – 4.15.0.1026.28
- linux-image-kvm – 4.15.0.1028.28
- linux-image-lowlatency – 4.15.0.43.45
- linux-image-oem – 4.15.0.1030.35
- linux-image-raspi2 – 4.15.0.1030.28
- linux-image-snapdragon – 4.15.0.43.45
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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