USN-3523-1: Linux kernel vulnerabilities

09 January 2018

Several security issues were fixed in the Linux kernel.

Releases

Packages

  • linux - Linux kernel

Details

Jann Horn discovered that microprocessors utilizing speculative execution
and indirect branch prediction may allow unauthorized memory reads via
sidechannel attacks. This flaw is known as Meltdown. A local attacker could
use this to expose sensitive information, including kernel memory.
(CVE-2017-5754)

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel did not properly check the relationship between pointer
values and the BPF stack. A local attacker could use this to cause a denial
of service (system crash) or possibly execute arbitrary code.
(CVE-2017-17863)

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel improperly performed sign extension in some situations.
A local attacker could use this to cause a denial of service (system crash)
or possibly execute arbitrary code. (CVE-2017-16995)

Alexei Starovoitov discovered that the Berkeley Packet Filter (BPF)
implementation in the Linux kernel contained a branch-pruning logic issue
around unreachable code. A local attacker could use this to cause a denial
of service. (CVE-2017-17862)

Jann Horn discovered that the Berkeley Packet Filter (BPF) implementation
in the Linux kernel mishandled pointer data values in some situations. A
local attacker could use this to to expose sensitive information (kernel
memory). (CVE-2017-17864)

Update instructions

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

Ubuntu 17.10

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-3541-1: linux-image-generic, linux-image-4.13.0-31-lowlatency, linux-image-lowlatency, linux-image-4.13.0-31-generic, linux
  • USN-3633-1: linux-euclid, linux-image-euclid, linux-image-4.4.0-9026-euclid
  • USN-3597-1: linux-image-generic-lpae, linux-image-generic, linux-image-4.13.0-37-generic-lpae, linux, linux-image-4.13.0-37-lowlatency, linux-raspi2, linux-image-lowlatency, linux-image-4.13.0-1015-raspi2, linux-image-raspi2, linux-image-4.13.0-37-generic
  • USN-3516-1: firefox
  • USN-3540-2: linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-111-powerpc-smp, linux-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-111-powerpc64-smp, linux-image-4.4.0-111-lowlatency, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-1011-aws, linux-image-4.4.0-111-powerpc64-emb, linux-image-generic-lts-xenial, linux-image-4.4.0-111-generic, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-111-powerpc-e500mc, linux-image-aws, linux-image-powerpc64-emb-lts-xenial, linux-aws
  • USN-3583-1: linux-image-generic-lpae, linux-image-generic, linux-image-powerpc64-smp, linux-image-3.13.0-142-powerpc-e500mc, linux-image-3.13.0-142-powerpc64-emb, linux-image-3.13.0-142-generic, linux-image-powerpc64-emb, linux-image-powerpc-e500, linux-image-3.13.0-142-lowlatency, linux-image-3.13.0-142-powerpc-smp, linux-image-lowlatency, linux-image-3.13.0-142-powerpc-e500, linux-image-3.13.0-142-generic-lpae, linux-image-3.13.0-142-powerpc64-smp, linux-image-powerpc-e500mc, linux, linux-image-powerpc-smp
  • USN-3597-2: linux-image-4.13.0-37-generic-lpae, linux-image-generic-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-hwe, linux-image-4.13.0-37-lowlatency, linux-image-lowlatency-hwe-16.04, linux-image-4.13.0-37-generic
  • USN-3522-2: linux-image-4.4.0-108-generic, linux-lts-xenial, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-1009-aws, linux-image-generic-lts-xenial, linux-image-4.4.0-108-lowlatency, linux-image-aws, linux-aws
  • USN-3525-1: linux-image-3.2.0-132-generic, linux-image-generic, linux-image-generic-pae, linux, linux-image-3.2.0-132-generic-pae
  • USN-3524-1: linux-image-generic, linux-image-3.13.0-139-lowlatency, linux-image-lowlatency, linux-image-3.13.0-139-generic, linux
  • USN-3541-2: linux-image-lowlatency-hwe-16.04, linux-image-4.13.0-1017-oem, linux-image-generic-hwe-16.04, linux-image-oem, linux-gcp, linux-hwe, linux-image-gke, linux-image-4.13.0-31-lowlatency, linux-image-4.13.0-1006-azure, linux-oem, linux-image-4.13.0-1007-gcp, linux-image-azure, linux-image-gcp, linux-image-4.13.0-31-generic, linux-azure
  • USN-3523-3: linux-image-4.13.0-1011-raspi2, linux-raspi2, linux-image-raspi2
  • USN-3524-2: linux-image-3.13.0-139-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-lts-trusty, linux-image-3.13.0-139-generic, linux-image-generic-lts-trusty
  • USN-3619-2: linux-image-generic-lpae-lts-xenial, linux-lts-xenial, linux-image-aws, linux-image-lowlatency-lts-xenial, linux-image-4.4.0-119-powerpc-smp, linux-image-4.4.0-1016-aws, linux-image-powerpc-smp-lts-xenial, linux-aws, linux-image-4.4.0-119-lowlatency, linux-image-4.4.0-119-powerpc64-smp, linux-image-generic-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-119-generic, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-119-powerpc64-emb, linux-image-powerpc64-emb-lts-xenial, linux-image-4.4.0-119-powerpc-e500mc, linux-image-4.4.0-119-generic-lpae
  • USN-3540-1: linux-image-4.4.0-9023-euclid, linux-image-4.4.0-112-powerpc64-smp, linux-image-powerpc64-smp, linux-image-4.4.0-112-lowlatency, linux, linux-image-4.4.0-112-powerpc-smp, linux-image-4.4.0-112-powerpc64-emb, linux-image-euclid, linux-image-4.4.0-1049-aws, linux-image-lowlatency, linux-image-4.4.0-112-powerpc-e500mc, linux-image-generic-lpae, linux-image-generic, linux-image-4.4.0-112-generic, linux-image-aws, linux-image-powerpc-e500mc, linux-image-powerpc-smp, linux-image-4.4.0-112-generic-lpae, linux-image-powerpc64-emb, linux-euclid, linux-aws
  • USN-3522-1: linux-image-generic, linux-image-4.4.0-108-generic, linux-image-4.4.0-1015-kvm, linux-image-kvm, linux-image-4.4.0-1047-aws, linux-euclid, linux-image-4.4.0-9021-euclid, linux-image-euclid, linux-image-4.4.0-108-lowlatency, linux-image-lowlatency, linux-kvm, linux-image-aws, linux, linux-aws
  • USN-3523-2: linux-image-4.13.0-26-lowlatency, linux-image-lowlatency-hwe-16.04, linux-image-generic-hwe-16.04, linux-image-4.13.0-26-generic-lpae, linux-gcp, linux-hwe, linux-image-generic-lpae-hwe-16.04, linux-image-gke, linux-image-oem, linux-image-4.13.0-26-generic, linux-oem, linux-image-azure, linux-image-gcp, linux-azure, linux-image-4.13.0-1006-gcp, linux-image-4.13.0-1005-azure, linux-image-4.13.0-1015-oem
  • USN-3619-1: linux-raspi2, linux-image-raspi2, linux-image-4.4.0-119-generic, linux-image-4.4.0-1054-aws, linux-image-powerpc64-smp, linux-image-4.4.0-119-powerpc64-emb, linux, linux-snapdragon, linux-image-4.4.0-119-powerpc-smp, linux-image-4.4.0-119-lowlatency, linux-image-lowlatency, linux-image-generic-lpae, linux-image-4.4.0-1020-kvm, linux-image-generic, linux-image-snapdragon, linux-image-aws, linux-image-powerpc-e500mc, linux-image-4.4.0-119-powerpc-e500mc, linux-image-4.4.0-119-generic-lpae, linux-image-4.4.0-1086-raspi2, linux-image-powerpc-smp, linux-image-4.4.0-1088-snapdragon, linux-image-kvm, linux-image-powerpc64-emb, linux-image-4.4.0-119-powerpc64-smp, linux-kvm, linux-aws