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CVE-2020-29569

Description

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x. The Linux kernel PV block backend expects the kernel thread handler to reset ring->xenblkd to NULL when stopped. However, the handler may not have time to run if the frontend quickly toggles between the states connect and disconnect. As a consequence, the block backend may re-use a pointer after it was freed. A misbehaving guest can trigger a dom0 crash by continuously connecting / disconnecting a block frontend. Privilege escalation and information leaks cannot be ruled out. This only affects systems with a Linux blkback.


Affected Package


OS OS Version Package Name Package Version
ubuntu Upstream linux-gke 5.11~rc1
ubuntu 20.04 linux-gke 5.4.0-1036.38
ubuntu Upstream linux-aws-5.8 5.11~rc1
ubuntu Upstream linux-azure-5.8 5.11~rc1
ubuntu Upstream linux-gcp-5.8 5.11~rc1
ubuntu Upstream linux-oracle-5.8 5.11~rc1
ubuntu Upstream linux-riscv-5.8 5.11~rc1
ubuntu 20.04 linux-riscv-5.8 5.8.0-17.19~20.04.1
ubuntu Upstream linux-hwe-5.11 5.11~rc1
ubuntu Upstream linux-riscv-5.11 5.11~rc1
ubuntu Upstream linux-oem-5.13 5.11~rc1
ubuntu Upstream linux-aws-5.11 5.11~rc1
ubuntu Upstream linux-azure-5.11 5.11~rc1
ubuntu Upstream linux-oracle-5.11 5.11~rc1
ubuntu Upstream linux-bluefield 5.11~rc1
ubuntu 20.04 linux-bluefield 5.4.0-1011.14
ubuntu Upstream linux 5.11~rc1
ubuntu 20.04 linux 5.4.0-66.74
ubuntu 18.04 linux 4.15.0-136.140
ubuntu 16.04 linux 4.4.0-204.236
ubuntu Upstream linux-hwe 5.11~rc1
ubuntu 16.04 linux-hwe 4.15.0-136.140~16.04.1
ubuntu Upstream linux-hwe-5.4 5.11~rc1
ubuntu 18.04 linux-hwe-5.4 5.4.0-66.74~18.04.2
ubuntu Upstream linux-hwe-edge 5.11~rc1
ubuntu Upstream linux-lts-trusty 5.11~rc1
ubuntu Upstream linux-lts-xenial 5.11~rc1
ubuntu 14.04 linux-lts-xenial 4.4.0-204.236~14.04.1
ubuntu Upstream linux-kvm 5.11~rc1
ubuntu 20.04 linux-kvm 5.4.0-1033.34
ubuntu 18.04 linux-kvm 4.15.0-1085.87
ubuntu 16.04 linux-kvm 4.4.0-1089.98
ubuntu Upstream linux-aws 5.11~rc1
ubuntu 20.04 linux-aws 5.4.0-1038.40
ubuntu 18.04 linux-aws 4.15.0-1094.101
ubuntu 16.04 linux-aws 4.4.0-1123.137
ubuntu 14.04 linux-aws 4.4.0-1087.91
ubuntu Upstream linux-aws-5.0 5.11~rc1
ubuntu Upstream linux-aws-5.3 5.11~rc1
ubuntu Upstream linux-aws-5.4 5.11~rc1
ubuntu 18.04 linux-aws-5.4 5.4.0-1038.40~18.04.1
ubuntu Upstream linux-aws-hwe 5.11~rc1
ubuntu 16.04 linux-aws-hwe 4.15.0-1094.101~16.04.1
ubuntu Upstream linux-azure 5.11~rc1
ubuntu 20.04 linux-azure 5.4.0-1040.42
ubuntu 16.04 linux-azure 4.15.0-1108.120~16.04.1
ubuntu 14.04 linux-azure 4.15.0-1108.120~14.04.1
ubuntu Upstream linux-azure-4.15 5.11~rc1
ubuntu 18.04 linux-azure-4.15 4.15.0-1108.120
ubuntu Upstream linux-azure-5.3 5.11~rc1
ubuntu Upstream linux-azure-5.4 5.11~rc1
ubuntu 18.04 linux-azure-5.4 5.4.0-1040.42~18.04.1
ubuntu Upstream linux-azure-edge 5.11~rc1
ubuntu Upstream linux-gcp 5.11~rc1
ubuntu 20.04 linux-gcp 5.4.0-1037.40
ubuntu 16.04 linux-gcp 4.15.0-1093.106~16.04.1
ubuntu Upstream linux-gcp-4.15 5.11~rc1
ubuntu 18.04 linux-gcp-4.15 4.15.0-1093.106
ubuntu Upstream linux-gcp-5.3 5.11~rc1
ubuntu Upstream linux-gcp-5.4 5.11~rc1
ubuntu 18.04 linux-gcp-5.4 5.4.0-1037.40~18.04.1
ubuntu Upstream linux-gcp-edge 5.11~rc1
ubuntu Upstream linux-gke-4.15 5.11~rc1
ubuntu 18.04 linux-gke-4.15 4.15.0-1079.84
ubuntu Upstream linux-gke-5.0 5.11~rc1
ubuntu 18.04 linux-gke-5.0 any
ubuntu Upstream linux-gke-5.3 5.11~rc1
ubuntu 18.04 linux-gke-5.3 any
ubuntu Upstream linux-oracle 5.11~rc1
ubuntu 20.04 linux-oracle 5.4.0-1038.41
ubuntu 18.04 linux-oracle 4.15.0-1065.73
ubuntu 16.04 linux-oracle 4.15.0-1065.73~16.04.1
ubuntu Upstream linux-oracle-5.0 5.11~rc1
ubuntu Upstream linux-oracle-5.3 5.11~rc1
ubuntu Upstream linux-oracle-5.4 5.11~rc1
ubuntu 18.04 linux-oracle-5.4 5.4.0-1038.41~18.04.1
ubuntu Upstream linux-oem 5.11~rc1
ubuntu 18.04 linux-oem any
ubuntu Upstream linux-oem-5.6 5.11~rc1
ubuntu 20.04 linux-oem-5.6 any
ubuntu Upstream linux-oem-osp1 5.11~rc1
ubuntu 18.04 linux-oem-osp1 any
ubuntu Upstream linux-raspi 5.11~rc1
ubuntu 20.04 linux-raspi 5.4.0-1029.32
ubuntu Upstream linux-raspi2 5.11~rc1
ubuntu 18.04 linux-raspi2 4.15.0-1079.84
ubuntu 16.04 linux-raspi2 4.4.0-1147.157
ubuntu Upstream linux-raspi2-5.3 5.11~rc1
ubuntu 18.04 linux-raspi2-5.3 any
ubuntu Upstream linux-raspi-5.4 5.11~rc1
ubuntu 18.04 linux-raspi-5.4 5.4.0-1029.32~18.04.1
ubuntu Upstream linux-riscv 5.11~rc1
ubuntu 20.04 linux-riscv any
ubuntu Upstream linux-snapdragon 5.11~rc1
ubuntu 18.04 linux-snapdragon 4.15.0-1096.105
ubuntu 16.04 linux-snapdragon 4.4.0-1151.161
ubuntu Upstream linux-hwe-5.8 5.11~rc1
ubuntu 20.04 linux-hwe-5.8 5.8.0-44.50~20.04.1
ubuntu Upstream linux-gke-5.4 5.11~rc1
ubuntu 18.04 linux-gke-5.4 5.4.0-1036.38~18.04.1
ubuntu Upstream linux-gkeop-5.4 5.11~rc1
ubuntu 18.04 linux-gkeop-5.4 5.4.0-1010.11~18.04.1
ubuntu Upstream linux-dell300x 5.11~rc1
ubuntu 18.04 linux-dell300x 4.15.0-1012.16
ubuntu Upstream linux-oem-5.10 5.11~rc1
ubuntu 20.04 linux-oem-5.10 5.10.0-1011.12
ubuntu Upstream linux-gkeop 5.11~rc1
ubuntu 20.04 linux-gkeop 5.4.0-1010.11
ubuntu Upstream linux-ibm 5.11~rc1
ubuntu Upstream linux-gcp-5.11 5.11~rc1
ubuntu Upstream linux-oem-5.14 5.11~rc1
ubuntu Upstream linux-intel-5.13 5.11~rc1
ubuntu Upstream linux-hwe-5.13 5.11~rc1
ubuntu Upstream linux-aws-5.13 5.11~rc1
ubuntu Upstream linux-fips 5.11~rc1
ubuntu Upstream linux-oracle-5.13 any
ubuntu Upstream linux-gcp-5.13 any
ubuntu Upstream linux-ibm-5.4 any
ubuntu Upstream linux-azure-fde any

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