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USN-4007-1: Linux kernel vulnerability

4 June 2019

A system hardening measure could be bypassed.

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Releases

Packages

Details

Federico Manuel Bento discovered that the Linux kernel did not properly
apply Address Space Layout Randomization (ASLR) in some situations for
setuid a.out binaries. A local attacker could use this to improve the
chances of exploiting an existing vulnerability in a setuid a.out binary.

As a hardening measure, this update disables a.out support.

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.

References

Related notices

  • USN-4008-1: linux-image-lowlatency-lts-wily, linux-image-virtual-lts-utopic, linux-raspi2, linux-image-4.4.0-150-powerpc64-smp, linux-image-lowlatency-lts-xenial, linux-image-lowlatency, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-e500mc-lts-wily, linux-image-powerpc-smp, linux-image-generic-lpae, linux-image-generic-lpae-lts-utopic, linux-image-generic-lpae-lts-xenial, linux-image-powerpc-smp-lts-utopic, linux-image-virtual-lts-xenial, linux-kvm, linux-image-4.4.0-1110-raspi2, linux-image-4.4.0-1047-kvm, linux-aws, linux-image-4.4.0-1114-snapdragon, linux-image-powerpc64-smp-lts-vivid, linux-image-virtual-lts-vivid, linux-image-generic-lts-xenial, linux-image-4.4.0-150-powerpc64-emb, linux-image-4.4.0-150-powerpc-smp, linux-image-powerpc64-smp, linux-image-generic-lpae-lts-wily, linux-image-powerpc64-emb-lts-vivid, linux-image-generic, linux-image-generic-lts-vivid, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc64-emb-lts-utopic, linux-image-virtual-lts-wily, linux-image-snapdragon, linux-image-powerpc64-emb-lts-xenial, linux-image-generic-lts-wily, linux-image-aws, linux-image-lowlatency-lts-vivid, linux-image-powerpc-e500mc, linux-image-powerpc64-smp-lts-wily, linux-image-powerpc64-smp-lts-xenial, linux-image-virtual, linux-image-kvm, linux-image-powerpc64-emb, linux-image-powerpc64-emb-lts-wily, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-1084-aws, linux-image-generic-lpae-lts-vivid, linux-image-lowlatency-lts-utopic, linux-image-raspi2, linux-image-4.4.0-150-generic-lpae, linux-image-powerpc64-smp-lts-utopic, linux-image-generic-lts-utopic, linux-image-powerpc-smp-lts-vivid, linux, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-150-generic, linux-snapdragon, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-150-lowlatency, linux-image-4.4.0-150-powerpc-e500mc
  • USN-4006-2: linux-image-4.18.0-21-lowlatency, linux-image-generic-lpae-hwe-18.04, linux-image-4.18.0-21-generic, linux-image-snapdragon-hwe-18.04, linux-image-4.18.0-21-generic-lpae, linux-hwe, linux-image-4.18.0-21-snapdragon, linux-image-lowlatency-hwe-18.04, linux-image-virtual-hwe-18.04, linux-image-generic-hwe-18.04
  • USN-4007-2: linux-image-4.15.0-51-generic, linux-oracle, linux-image-generic-hwe-16.04, linux-image-4.15.0-1040-aws, linux-image-oem, linux-image-generic-lpae-hwe-16.04, linux-image-aws-hwe, linux-hwe, linux-image-4.15.0-1014-oracle, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-51-lowlatency, linux-image-4.15.0-51-generic-lpae, linux-image-oracle, linux-image-virtual-hwe-16.04, linux-aws-hwe
  • USN-4006-1: linux-image-4.18.0-1017-aws, linux-raspi2, linux-image-lowlatency, linux-image-generic-lpae, linux-image-4.18.0-1015-raspi2, linux-kvm, linux-image-4.18.0-21-lowlatency, linux-image-4.18.0-21-generic, linux-aws, linux-image-4.18.0-21-snapdragon, linux-image-generic, linux-image-4.18.0-1013-kvm, linux-image-gcp, linux-image-snapdragon, linux-image-4.18.0-1012-gcp, linux-image-4.18.0-21-generic-lpae, linux-image-aws, linux-image-kvm, linux-image-raspi2, linux-gcp, linux, linux-image-gke
  • USN-4008-3: linux-image-4.4.0-150-powerpc64-smp, linux-image-lowlatency-lts-xenial, linux-image-generic-lpae-lts-xenial, linux-image-virtual-lts-xenial, linux-image-4.4.0-1045-aws, linux-aws, linux-image-generic-lts-xenial, linux-image-4.4.0-150-powerpc64-emb, linux-image-4.4.0-150-powerpc-smp, linux-image-powerpc64-emb-lts-xenial, linux-lts-xenial, linux-image-aws, linux-image-powerpc64-smp-lts-xenial, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-150-generic-lpae, linux-image-4.4.0-150-generic, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-150-lowlatency, linux-image-4.4.0-150-powerpc-e500mc

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