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USN-3833-1: Linux kernel (AWS) vulnerabilities

30 November 2018

Several security issues were fixed in the Linux kernel.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Releases

Packages

  • linux-aws - Linux kernel for Amazon Web Services (AWS) systems

Details

Jann Horn discovered that the Linux kernel mishandles mapping UID or GID
ranges inside nested user namespaces in some situations. A local attacker
could use this to bypass access controls on resources outside the
namespace. (CVE-2018-18955)

Philipp Wendler discovered that the overlayfs implementation in the Linux
kernel did not properly verify the directory contents permissions from
within a unprivileged user namespace. A local attacker could use this to
expose sensitive information (protected file names). (CVE-2018-6559)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

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

Ubuntu 18.04

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.

Related notices

  • USN-3835-1: linux-gcp, linux-image-4.18.0-1005-kvm, linux-image-4.18.0-12-generic, linux-image-snapdragon, linux-image-4.18.0-1004-gcp, linux-kvm, linux-image-raspi2, linux-image-generic, linux-image-4.18.0-12-snapdragon, linux-image-gcp, linux-image-4.18.0-1007-raspi2, linux, linux-image-generic-lpae, linux-image-4.18.0-12-generic-lpae, linux-image-gke, linux-image-kvm, linux-image-4.18.0-12-lowlatency, linux-raspi2, linux-image-lowlatency
  • USN-3836-1: linux, linux-image-4.15.0-1029-raspi2, linux-gcp, linux-image-unsigned-4.15.0-1025-gcp, linux-image-4.15.0-42-generic-lpae, linux-image-4.15.0-1027-kvm, linux-kvm, linux-image-4.15.0-42-lowlatency, linux-image-unsigned-4.15.0-42-lowlatency, linux-image-4.15.0-42-generic, linux-image-unsigned-4.15.0-42-generic, linux-raspi2, linux-image-4.15.0-42-snapdragon
  • USN-3836-2: linux-gcp, linux-image-unsigned-4.15.0-1025-gcp, linux-image-4.15.0-42-generic-lpae, linux-image-4.15.0-42-lowlatency, linux-image-unsigned-4.15.0-42-lowlatency, linux-image-4.15.0-42-generic, linux-image-unsigned-4.15.0-42-generic, linux-hwe
  • USN-3832-1: linux-image-aws, linux-image-4.18.0-1006-aws, linux-aws