An issue was discovered in the Linux kernel before 5.0. The function __mdiobus_register() in drivers/net/phy/mdio_bus.c calls put_device(), which will trigger a fixed_mdio_bus_init use-after-free. This will cause a denial of service.

Affected Package

OS OS Version Package Name Package Version
ubuntu 14.04 linux-aws any
ubuntu 16.04 linux-aws 4.4.0-1081.91
ubuntu 18.04 linux-aws 4.15.0-1047.49
ubuntu 14.04 linux-azure any
ubuntu 18.04 linux-azure 5.0.0-1014.14~18.04.1
ubuntu 16.04 linux-azure 4.15.0-1055.60
ubuntu 16.04 linux-euclid any
ubuntu 16.04 linux-aws-hwe 4.15.0-1047.49~16.04.1
ubuntu 14.04 linux any
ubuntu upstream linux 5.0~rc8
ubuntu 16.04 linux 4.4.0-146.172
ubuntu upstream linux-azure-edge 5.0~rc8
ubuntu 16.04 linux-azure-edge 4.15.0-1055.60
ubuntu upstream linux-flo 5.0~rc8
ubuntu upstream linux-gcp 5.0~rc8
ubuntu 16.04 linux-gcp 4.15.0-1040.42~16.04.1
ubuntu upstream linux-gcp-edge 5.0~rc8
ubuntu upstream linux-gke 5.0~rc8
ubuntu upstream linux-gke-4.15 5.0~rc8
ubuntu upstream linux-gke-5.0 5.0~rc8
ubuntu upstream linux-goldfish 5.0~rc8
ubuntu upstream linux-grouper 5.0~rc8
ubuntu upstream linux-hwe 5.0~rc8
ubuntu 16.04 linux-hwe 4.15.0-58.64~16.04.1
ubuntu upstream linux-hwe-edge 5.0~rc8
ubuntu 16.04 linux-hwe-edge 4.15.0-58.64~16.04.1
ubuntu upstream linux-kvm 5.0~rc8
ubuntu 16.04 linux-kvm 4.4.0-1044.50
ubuntu upstream linux-lts-trusty 5.0~rc8
ubuntu upstream linux-lts-utopic 5.0~rc8
ubuntu upstream linux-lts-vivid 5.0~rc8
ubuntu upstream linux-lts-wily 5.0~rc8
ubuntu 14.04 linux-lts-xenial any
ubuntu upstream linux-lts-xenial 5.0~rc8
ubuntu upstream linux-maguro 5.0~rc8
ubuntu upstream linux-mako 5.0~rc8
ubuntu upstream linux-manta 5.0~rc8
ubuntu 19.04 linux-oem 4.15.0-1050.57
ubuntu upstream linux-oem 5.0~rc8
ubuntu 16.04 linux-oem any
ubuntu 19.04 linux-oracle 5.0.0-1004.8
ubuntu upstream linux-oracle 5.0~rc8
ubuntu 16.04 linux-oracle 4.15.0-1021.23~16.04.1
ubuntu upstream linux-raspi2 5.0~rc8
ubuntu 16.04 linux-raspi2 4.4.0-1107.115
ubuntu upstream linux-snapdragon 5.0~rc8
ubuntu 16.04 linux-snapdragon 4.4.0-1111.116