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USN-4116-1: Linux kernel vulnerabilities

2 September 2019

Several security issues were fixed in the Linux kernel.




It was discovered that a use-after-free error existed in the block layer
subsystem of the Linux kernel when certain failure conditions occurred. A
local attacker could possibly use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2018-20856)

Amit Klein and Benny Pinkas discovered that the Linux kernel did not
sufficiently randomize IP ID values generated for connectionless networking
protocols. A remote attacker could use this to track particular Linux
devices. (CVE-2019-10638)

Praveen Pandey discovered that the Linux kernel did not properly validate
sent signals in some situations on PowerPC systems with transactional
memory disabled. A local attacker could use this to cause a denial of
service. (CVE-2019-13648)

It was discovered that the floppy driver in the Linux kernel did not
properly validate meta data, leading to a buffer overread. A local attacker
could use this to cause a denial of service (system crash).

It was discovered that the floppy driver in the Linux kernel did not
properly validate ioctl() calls, leading to a division-by-zero. A local
attacker could use this to cause a denial of service (system crash).

Jason Wang discovered that an infinite loop vulnerability existed in the
virtio net driver in the Linux kernel. A local attacker in a guest VM could
possibly use this to cause a denial of service in the host system.

Update instructions

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

Ubuntu 16.04

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-4118-1: linux-image-aws, linux-aws-hwe, linux-image-4.15.0-1047-aws, linux-aws, linux-image-aws-hwe
  • USN-4094-1: linux-image-lowlatency, linux-image-4.15.0-1042-kvm, linux-image-4.15.0-1040-gcp, linux-image-generic-hwe-16.04-edge, linux-image-generic-lpae, linux-image-4.15.0-1043-raspi2, linux-image-snapdragon, linux-image-4.15.0-1040-gke, linux-image-4.15.0-58-generic-lpae, linux-gke-4.15, linux, linux-azure, linux-image-gke-4.15, linux-oracle, linux-image-virtual, linux-image-gcp, linux-raspi2, linux-image-4.15.0-58-lowlatency, linux-image-generic, linux-image-4.15.0-58-generic, linux-image-generic-hwe-16.04, linux-gcp, linux-image-virtual-hwe-16.04, linux-kvm, linux-image-4.15.0-1021-oracle, linux-image-kvm, linux-image-lowlatency-hwe-16.04-edge, linux-image-raspi2, linux-image-oracle, linux-oem, linux-image-gke, linux-image-generic-lpae-hwe-16.04-edge, linux-image-oem, linux-image-4.15.0-1060-snapdragon, linux-hwe, linux-image-4.15.0-1050-oem, linux-image-virtual-hwe-16.04-edge, linux-snapdragon, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency-hwe-16.04
  • USN-4114-1: linux-image-lowlatency, linux-gke-5.0, linux-image-virtual-hwe-18.04, linux-image-5.0.0-27-generic, linux-image-generic-lpae-hwe-18.04, linux-image-generic-lpae, linux-image-snapdragon, linux, linux-azure, linux-image-virtual, linux-image-gcp, linux-raspi2, linux-image-generic, linux-image-5.0.0-27-generic-lpae, linux-image-5.0.0-1015-gke, linux-gcp, linux-kvm, linux-image-generic-hwe-18.04, linux-image-kvm, linux-image-5.0.0-27-lowlatency, linux-image-5.0.0-1015-gcp, linux-image-raspi2, linux-image-5.0.0-1018-azure, linux-image-5.0.0-1015-kvm, linux-image-snapdragon-hwe-18.04, linux-image-5.0.0-1019-snapdragon, linux-image-gke, linux-image-lowlatency-hwe-18.04, linux-image-5.0.0-1015-raspi2, linux-hwe, linux-snapdragon, linux-image-gke-5.0, linux-image-azure
  • USN-4115-1: linux-image-lowlatency, linux-image-4.15.0-1022-oracle, linux-image-4.15.0-1041-gcp, linux-image-4.15.0-1056-azure, linux-image-generic-hwe-16.04-edge, linux-image-generic-lpae, linux-image-4.15.0-1044-raspi2, linux-image-gke-4.15, linux-gke-4.15, linux, linux-azure, linux-oracle, linux-image-virtual, linux-image-gcp, linux-raspi2, linux-image-generic, linux-image-generic-hwe-16.04, linux-gcp, linux-image-virtual-hwe-16.04, linux-kvm, linux-image-kvm, linux-image-lowlatency-hwe-16.04-edge, linux-image-raspi2, linux-image-oracle, linux-image-4.15.0-1043-kvm, linux-image-gke, linux-image-generic-lpae-hwe-16.04-edge, linux-image-oem, linux-image-4.15.0-1041-gke, linux-image-4.15.0-60-lowlatency, linux-image-4.15.0-60-generic-lpae, linux-hwe, linux-image-virtual-hwe-16.04-edge, linux-image-4.15.0-60-generic, linux-image-generic-lpae-hwe-16.04, linux-image-lowlatency-hwe-16.04, linux-image-azure
  • USN-4117-1: linux-image-aws, linux-image-5.0.0-1014-aws, linux-aws