USN-4068-1: Linux kernel vulnerabilities
linux, linux-aws, linux-gcp, linux-kvm, linux-oracle, linux-raspi2, linux-snapdragon 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-gcp – Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm – Linux kernel for cloud environments
- linux-oracle – Linux kernel for Oracle Cloud systems
- linux-raspi2 – Linux kernel for Raspberry Pi 2
- linux-snapdragon – Linux kernel for Snapdragon processors
Details
Adam Zabrocki discovered that the Intel i915 kernel mode graphics driver in
the Linux kernel did not properly restrict mmap() ranges in some
situations. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2019-11085)
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)
It was discovered that the ext4 file system implementation in the Linux
kernel did not properly zero out memory in some situations. A local
attacker could use this to expose sensitive information (kernel memory).
(CVE-2019-11833)
It was discovered that the Bluetooth Human Interface Device Protocol (HIDP)
implementation in the Linux kernel did not properly verify strings were
NULL terminated in certain situations. A local attacker could use this to
expose sensitive information (kernel memory). (CVE-2019-11884)
Update instructions
The problem can be corrected by updating your system to the following package versions:
- Ubuntu 18.04 LTS
- linux-image-4.15.0-1018-oracle – 4.15.0-1018.20
- linux-image-4.15.0-1037-gcp – 4.15.0-1037.39
- linux-image-4.15.0-1039-kvm – 4.15.0-1039.39
- linux-image-4.15.0-1041-raspi2 – 4.15.0-1041.44
- linux-image-4.15.0-1044-aws – 4.15.0-1044.46
- linux-image-4.15.0-1058-snapdragon – 4.15.0-1058.64
- linux-image-4.15.0-55-generic – 4.15.0-55.60
- linux-image-4.15.0-55-generic-lpae – 4.15.0-55.60
- linux-image-4.15.0-55-lowlatency – 4.15.0-55.60
- linux-image-aws – 4.15.0.1044.43
- linux-image-gcp – 4.15.0.1037.39
- linux-image-generic – 4.15.0.55.57
- linux-image-generic-lpae – 4.15.0.55.57
- linux-image-kvm – 4.15.0.1039.39
- linux-image-lowlatency – 4.15.0.55.57
- linux-image-oracle – 4.15.0.1018.21
- linux-image-powerpc-e500mc – 4.15.0.55.57
- linux-image-powerpc-smp – 4.15.0.55.57
- linux-image-powerpc64-emb – 4.15.0.55.57
- linux-image-powerpc64-smp – 4.15.0.55.57
- linux-image-raspi2 – 4.15.0.1041.39
- linux-image-snapdragon – 4.15.0.1058.61
- linux-image-virtual – 4.15.0.55.57
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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