1. Ubuntu Security Notices
  2. USN-4068-2

USN-4068-2: Linux kernel (HWE) vulnerabilities

Publication date

23 July 2019

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
  • linux-hwe - Linux hardware enablement (HWE) kernel

Details

USN-4068-1 fixed vulnerabilities in the Linux kernel for Ubuntu
18.04 LTS. This update provides the corresponding updates for the
Linux Hardware Enablement (HWE) kernel from Ubuntu 18.04 for Ubuntu
16.04 LTS.

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 disabled via blocklist 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. (

USN-4068-1 fixed vulnerabilities in the Linux kernel for Ubuntu
18.04 LTS. This update provides the corresponding updates for the
Linux Hardware Enablement (HWE) kernel from Ubuntu 18.04 for Ubuntu
16.04 LTS.

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 disabled via blocklist 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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

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

Ubuntu Release Package Version
16.04 xenial linux-image-4.15.0-1037-gcp –  4.15.0-1037.39~16.04.1
linux-image-4.15.0-55-generic –  4.15.0-55.60~16.04.2
linux-image-4.15.0-55-generic-lpae –  4.15.0-55.60~16.04.2
linux-image-4.15.0-55-lowlatency –  4.15.0-55.60~16.04.2
linux-image-gcp –  4.15.0.1037.51
linux-image-generic-hwe-16.04 –  4.15.0.55.76
linux-image-generic-lpae-hwe-16.04 –  4.15.0.55.76
linux-image-gke –  4.15.0.1037.51
linux-image-lowlatency-hwe-16.04 –  4.15.0.55.76
linux-image-oem –  4.15.0.55.76
linux-image-virtual-hwe-16.04 –  4.15.0.55.76

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References

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