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USN-3934-1: PolicyKit vulnerability

3 April 2019

PolicyKit could allow unintended access.

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

  • policykit-1 - framework for managing administrative policies and privileges

Details

It was discovered that PolicyKit incorrectly relied on the fork() system
call in the Linux kernel being atomic. A local attacker could possibly use
this issue to gain access to services that have cached authorizations.

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 18.10
Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

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

References

Related notices

  • USN-3903-2: linux-image-4.18.0-16-generic, linux-image-4.18.0-16-generic-lpae, linux-image-4.18.0-1013-azure, linux-image-generic-lpae-hwe-18.04, linux-azure, linux-image-4.18.0-16-snapdragon, linux-image-virtual-hwe-18.04, linux-image-lowlatency-hwe-18.04, linux-image-azure, linux-hwe, linux-image-snapdragon-hwe-18.04, linux-image-generic-hwe-18.04, linux-image-4.18.0-16-lowlatency
  • USN-3934-2: libpolkit-backend-1-0, policykit-1
  • USN-3901-1: linux-image-oem, linux-image-4.15.0-1032-raspi2, linux-image-4.15.0-1030-kvm, linux-image-generic-lpae-hwe-16.04-edge, linux, linux-image-virtual-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-46-generic, linux-image-4.15.0-1033-aws, linux-image-raspi2, linux-image-4.15.0-1009-oracle, linux-image-aws, linux-oracle, linux-image-4.15.0-46-lowlatency, linux-image-generic-hwe-16.04-edge, linux-aws, linux-gcp, linux-image-4.15.0-1028-gcp, linux-raspi2, linux-image-4.15.0-46-snapdragon, linux-image-generic-hwe-16.04, linux-image-4.15.0-46-generic-lpae, linux-image-lowlatency-hwe-16.04, linux-oem, linux-image-oracle, linux-image-virtual, linux-image-kvm, linux-image-gke, linux-image-lowlatency-hwe-16.04-edge, linux-image-gcp, linux-image-virtual-hwe-16.04-edge, linux-image-generic-lpae, linux-image-4.15.0-1034-oem, linux-image-snapdragon, linux-image-generic, linux-image-lowlatency, linux-kvm
  • USN-3901-2: linux-image-oem, linux-image-virtual-hwe-16.04, linux-image-generic-lpae-hwe-16.04, linux-image-4.15.0-46-generic, linux-image-4.15.0-1033-aws, linux-image-4.15.0-1009-oracle, linux-image-azure, linux-oracle, linux-hwe, linux-image-4.15.0-46-lowlatency, linux-azure, linux-gcp, linux-image-4.15.0-1028-gcp, linux-image-aws-hwe, linux-image-generic-hwe-16.04, linux-image-4.15.0-46-generic-lpae, linux-aws-hwe, linux-image-lowlatency-hwe-16.04, linux-image-4.15.0-1040-azure, linux-image-oracle, linux-image-gke, linux-image-gcp
  • USN-3910-2: linux-image-lowlatency-lts-xenial, linux-image-4.4.0-143-powerpc-e500mc, linux-image-4.4.0-1039-aws, linux-image-4.4.0-143-powerpc-smp, linux-image-generic-lts-xenial, linux-image-powerpc-smp-lts-xenial, linux-image-4.4.0-143-generic-lpae, linux-image-aws, linux-lts-xenial, linux-image-powerpc64-emb-lts-xenial, linux-image-virtual-lts-xenial, linux-aws, linux-image-powerpc-e500mc-lts-xenial, linux-image-4.4.0-143-powerpc64-emb, linux-image-4.4.0-143-powerpc64-smp, linux-image-4.4.0-143-lowlatency, linux-image-generic-lpae-lts-xenial, linux-image-powerpc64-smp-lts-xenial, linux-image-4.4.0-143-generic
  • USN-3910-1: linux-image-lowlatency-lts-xenial, linux-image-4.4.0-143-powerpc-e500mc, linux-image-generic-lpae-lts-utopic, linux-image-powerpc64-smp-lts-vivid, linux-image-powerpc64-smp, linux-image-powerpc64-emb-lts-wily, linux-image-4.4.0-143-powerpc-smp, linux-image-generic-lts-xenial, linux-image-lowlatency-lts-vivid, linux-image-powerpc-smp-lts-wily, linux-image-4.4.0-1041-kvm, linux-image-powerpc64-emb-lts-utopic, linux-image-4.4.0-1108-snapdragon, linux, linux-snapdragon, linux-image-powerpc-smp-lts-vivid, linux-image-powerpc-smp-lts-xenial, linux-image-generic-lpae-lts-vivid, linux-image-4.4.0-143-generic-lpae, linux-image-generic-lts-vivid, linux-image-powerpc64-emb-lts-vivid, linux-image-raspi2, linux-image-aws, linux-image-powerpc-e500mc-lts-utopic, linux-image-powerpc-smp, linux-image-powerpc-smp-lts-utopic, linux-image-generic-lts-utopic, linux-image-powerpc64-emb-lts-xenial, linux-image-virtual-lts-xenial, linux-image-powerpc64-emb, linux-image-powerpc-e500mc-lts-wily, linux-aws, linux-image-powerpc-e500mc-lts-vivid, linux-image-powerpc-e500mc-lts-xenial, linux-image-virtual-lts-vivid, linux-image-4.4.0-143-powerpc64-emb, linux-raspi2, linux-image-virtual-lts-wily, linux-image-4.4.0-143-powerpc64-smp, linux-image-lowlatency-lts-utopic, linux-image-4.4.0-1077-aws, linux-image-powerpc-e500mc, linux-image-virtual-lts-utopic, linux-image-powerpc64-smp-lts-utopic, linux-image-virtual, linux-image-lowlatency-lts-wily, linux-image-4.4.0-143-lowlatency, linux-image-generic-lpae-lts-xenial, linux-image-kvm, linux-image-powerpc64-smp-lts-xenial, linux-image-generic-lts-wily, linux-image-generic-lpae, linux-image-4.4.0-143-generic, linux-image-powerpc64-smp-lts-wily, linux-image-generic-lpae-lts-wily, linux-image-generic, linux-image-lowlatency, linux-image-4.4.0-1104-raspi2, linux-image-snapdragon, linux-kvm
  • USN-3908-1: linux-image-3.13.0-166-powerpc64-smp, linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-166-generic, linux-image-omap, linux-image-powerpc64-smp, linux, linux-image-generic-lpae-lts-saucy, linux-image-generic-lts-raring, linux-image-3.13.0-166-generic-lpae, linux-image-generic-pae, linux-image-3.13.0-166-lowlatency, linux-image-powerpc-smp, linux-image-powerpc-e500, linux-image-highbank, linux-image-powerpc64-emb, linux-image-3.13.0-166-powerpc-e500, linux-image-lowlatency-pae, linux-image-3.13.0-166-powerpc64-emb, linux-image-generic-lts-trusty, linux-image-3.13.0-166-powerpc-smp, linux-image-generic-lts-saucy, linux-image-powerpc-e500mc, linux-image-virtual, linux-image-generic-lts-quantal, linux-image-3.13.0-166-powerpc-e500mc, linux-image-generic-lpae, linux-image-generic, linux-image-lowlatency
  • USN-3908-2: linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-166-generic-lpae, linux-image-3.13.0-166-generic, linux-image-3.13.0-166-lowlatency, linux-image-generic-lts-trusty, linux-lts-trusty
  • USN-3903-1: linux-image-4.18.0-16-snapdragon, linux-image-4.18.0-1007-gcp, linux, linux-image-4.18.0-16-lowlatency, linux-image-4.18.0-16-generic-lpae, linux-image-raspi2, linux-image-azure, linux-image-4.18.0-1008-kvm, linux-image-4.18.0-16-generic, linux-azure, linux-gcp, linux-raspi2, linux-image-4.18.0-1013-azure, linux-image-kvm, linux-image-gke, linux-image-gcp, linux-image-generic-lpae, linux-image-snapdragon, linux-image-generic, linux-image-lowlatency, linux-image-4.18.0-1010-raspi2, linux-kvm