USN-3880-1: Linux kernel vulnerabilities

04 February 2019

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel

Details

It was discovered that the CIFS client implementation in the Linux kernel
did not properly handle setup negotiation during session recovery, leading
to a NULL pointer exception. An attacker could use this to create a
malicious CIFS server that caused a denial of service (client system
crash). (CVE-2018-1066)

Jann Horn discovered that the procfs file system implementation in the
Linux kernel did not properly restrict the ability to inspect the kernel
stack of an arbitrary task. A local attacker could use this to expose
sensitive information. (CVE-2018-17972)

Jann Horn discovered that the mremap() system call in the Linux kernel did
not properly flush the TLB when completing, potentially leaving access to a
physical page after it has been released to the page allocator. A local
attacker could use this to cause a denial of service (system crash), expose
sensitive information, or possibly execute arbitrary code. (CVE-2018-18281)

It was discovered that the socket implementation in the Linux kernel
contained a type confusion error that could lead to memory corruption. A
local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2018-9568)

Update instructions

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

Ubuntu 14.04

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-3871-4: linux-image-generic-lpae-hwe-16.04, linux-gcp, linux-image-4.15.0-45-lowlatency, linux-image-generic-hwe-16.04, linux-image-gke, linux-image-lowlatency-hwe-16.04, linux-image-virtual-hwe-16.04, linux-image-4.15.0-45-generic-lpae, linux-aws-hwe, linux-image-4.15.0-45-generic, linux-image-4.15.0-1027-gcp, linux-image-gcp, linux-image-oem, linux-image-4.15.0-1032-aws, linux-hwe, linux-image-aws-hwe
  • USN-3880-2: linux-lts-trusty, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-165-generic-lpae, linux-image-3.13.0-165-generic
  • USN-3832-1: linux-aws, linux-image-aws, linux-image-4.18.0-1006-aws
  • USN-3871-5: linux-azure, linux-image-azure, linux-image-4.15.0-1037-azure
  • USN-3821-1: linux-raspi2, linux-image-4.4.0-139-powerpc64-emb, linux-kvm, linux-aws, linux-image-4.4.0-1037-kvm, linux-image-generic, linux-image-aws, linux-image-raspi2, linux-image-powerpc-smp, linux-image-powerpc64-emb, linux-image-powerpc64-smp, linux-image-4.4.0-1104-snapdragon, linux-image-4.4.0-139-lowlatency, linux-image-kvm, linux-snapdragon, linux-image-4.4.0-139-generic-lpae, linux-image-4.4.0-139-powerpc-smp, linux-image-4.4.0-139-generic, linux-image-powerpc-e500mc, linux-image-generic-lpae, linux-image-4.4.0-1100-raspi2, linux, linux-image-lowlatency, linux-image-4.4.0-1072-aws, linux-image-snapdragon, linux-image-4.4.0-139-powerpc64-smp, linux-image-4.4.0-139-powerpc-e500mc
  • USN-3871-3: linux-image-aws, linux-gcp, linux-image-4.15.0-1031-raspi2, linux-image-gke, linux-image-raspi2, linux-raspi2, linux-kvm, linux-image-4.15.0-1033-oem, linux-image-gcp, linux-image-4.15.0-1027-gcp, linux-oem, linux-image-oem, linux-aws, linux-image-4.15.0-1032-aws, linux-image-kvm, linux-image-4.15.0-1029-kvm
  • USN-3821-2: linux-image-4.4.0-139-powerpc-smp, linux-image-4.4.0-1034-aws, linux-image-aws, linux-image-generic-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-139-powerpc64-emb, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-lts-xenial, linux-image-4.4.0-139-lowlatency, linux-aws, linux-image-4.4.0-139-generic, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-139-powerpc64-smp, linux-image-4.4.0-139-powerpc-e500mc, linux-image-4.4.0-139-generic-lpae
  • USN-3835-1: linux-raspi2, linux-gcp, linux-kvm, linux-image-generic, linux-image-raspi2, linux-image-4.18.0-1004-gcp, linux-image-4.18.0-12-generic-lpae, linux-image-kvm, linux-image-4.18.0-12-lowlatency, linux-image-4.18.0-1007-raspi2, linux-image-gcp, linux-image-generic-lpae, linux-image-gke, linux-image-4.18.0-1005-kvm, linux-image-4.18.0-12-generic, linux-image-4.18.0-12-snapdragon, linux, linux-image-lowlatency, linux-image-snapdragon
  • USN-3871-1: linux-image-generic, linux-image-generic-lpae, linux-image-4.15.0-44-generic-lpae, linux, linux-image-lowlatency, linux-image-4.15.0-44-snapdragon, linux-image-4.15.0-44-generic, linux-image-snapdragon, linux-image-4.15.0-44-lowlatency