Buffer overflow in Xen - CVE-2020-29568
Published: December 15, 2020 / Updated: April 30, 2021
Vulnerability identifier: #VU52772
CSH Severity: Low
CVSS v4: 8.2 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H]
CVE-ID: CVE-2020-29568
CWE-ID: CWE-119
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local authenticated user to a crash the entire system.
An issue was discovered in Xen through 4.14.x. Some OSes (such as Linux, FreeBSD, and NetBSD) are processing watch events using a single thread. If the events are received faster than the thread is able to handle, they will get queued. As the queue is unbounded, a guest may be able to trigger an OOM in the backend. All systems with a FreeBSD, Linux, or NetBSD (any version) dom0 are vulnerable.
Affected software
Xen
Amazon Linux AMI
Ubuntu
openEuler
linux (Ubuntu package)
linux-raspi2 (Ubuntu package)
linux-lts-xenial (Ubuntu package)
linux-aws (Ubuntu package)
linux-kvm (Ubuntu package)
linux-snapdragon (Ubuntu package)
linux-hwe (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure (Ubuntu package)
linux-oracle (Ubuntu package)
linux-gke-4.15 (Ubuntu package)
linux-aws-hwe (Ubuntu package)
linux-azure-4.15 (Ubuntu package)
linux-gcp-4.15 (Ubuntu package)
linux-hwe-5.4 (Ubuntu package)
linux-gke-5.4 (Ubuntu package)
linux-gkeop-5.4 (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-raspi (Ubuntu package)
linux-aws-5.4 (Ubuntu package)
linux-azure-5.4 (Ubuntu package)
linux-oracle-5.4 (Ubuntu package)
linux-gcp-5.4 (Ubuntu package)
linux-raspi-5.4 (Ubuntu package)
kernel
bpftool
kernel-debugsource
kernel-tools
kernel-debuginfo
perf-debuginfo
python3-perf-debuginfo
python2-perf
python3-perf
bpftool-debuginfo
kernel-tools-devel
kernel-devel
kernel-tools-debuginfo
python2-perf-debuginfo
kernel-source
perf
linux-image-5.8.0-44-generic-lpae (Ubuntu package)
linux-image-5.8.0-44-lowlatency (Ubuntu package)
linux-image-5.8.0-44-generic (Ubuntu package)
linux-image-5.8.0-44-generic-64k (Ubuntu package)
linux-image-5.8.0-1016-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1016-raspi (Ubuntu package)
linux-image-5.8.0-1019-kvm (Ubuntu package)
linux-image-5.8.0-1021-oracle (Ubuntu package)
linux-image-5.8.0-1023-gcp (Ubuntu package)
linux-image-5.8.0-1023-azure (Ubuntu package)
linux-image-5.8.0-1024-aws (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-aws (Ubuntu package)
Amazon Linux AMI
Ubuntu
openEuler
linux (Ubuntu package)
linux-raspi2 (Ubuntu package)
linux-lts-xenial (Ubuntu package)
linux-aws (Ubuntu package)
linux-kvm (Ubuntu package)
linux-snapdragon (Ubuntu package)
linux-hwe (Ubuntu package)
linux-gcp (Ubuntu package)
linux-azure (Ubuntu package)
linux-oracle (Ubuntu package)
linux-gke-4.15 (Ubuntu package)
linux-aws-hwe (Ubuntu package)
linux-azure-4.15 (Ubuntu package)
linux-gcp-4.15 (Ubuntu package)
linux-hwe-5.4 (Ubuntu package)
linux-gke-5.4 (Ubuntu package)
linux-gkeop-5.4 (Ubuntu package)
linux-gkeop (Ubuntu package)
linux-raspi (Ubuntu package)
linux-aws-5.4 (Ubuntu package)
linux-azure-5.4 (Ubuntu package)
linux-oracle-5.4 (Ubuntu package)
linux-gcp-5.4 (Ubuntu package)
linux-raspi-5.4 (Ubuntu package)
kernel
bpftool
kernel-debugsource
kernel-tools
kernel-debuginfo
perf-debuginfo
python3-perf-debuginfo
python2-perf
python3-perf
bpftool-debuginfo
kernel-tools-devel
kernel-devel
kernel-tools-debuginfo
python2-perf-debuginfo
kernel-source
perf
linux-image-5.8.0-44-generic-lpae (Ubuntu package)
linux-image-5.8.0-44-lowlatency (Ubuntu package)
linux-image-5.8.0-44-generic (Ubuntu package)
linux-image-5.8.0-44-generic-64k (Ubuntu package)
linux-image-5.8.0-1016-raspi-nolpae (Ubuntu package)
linux-image-5.8.0-1016-raspi (Ubuntu package)
linux-image-5.8.0-1019-kvm (Ubuntu package)
linux-image-5.8.0-1021-oracle (Ubuntu package)
linux-image-5.8.0-1023-gcp (Ubuntu package)
linux-image-5.8.0-1023-azure (Ubuntu package)
linux-image-5.8.0-1024-aws (Ubuntu package)
linux-image-lowlatency (Ubuntu package)
linux-image-virtual (Ubuntu package)
linux-image-oem-20.04 (Ubuntu package)
linux-image-generic-lpae (Ubuntu package)
linux-image-generic-64k (Ubuntu package)
linux-image-generic (Ubuntu package)
linux-image-generic-lpae-hwe-20.04 (Ubuntu package)
linux-image-generic-hwe-20.04 (Ubuntu package)
linux-image-generic-64k-hwe-20.04 (Ubuntu package)
linux-image-lowlatency-hwe-20.04 (Ubuntu package)
linux-image-virtual-hwe-20.04 (Ubuntu package)
linux-image-raspi-nolpae (Ubuntu package)
linux-image-raspi (Ubuntu package)
linux-image-kvm (Ubuntu package)
linux-image-oracle (Ubuntu package)
linux-image-gke (Ubuntu package)
linux-image-gcp (Ubuntu package)
linux-image-azure (Ubuntu package)
linux-image-aws (Ubuntu package)
How to mitigate CVE-2020-29568
Install update from vendor's website.
linux (Ubuntu package) - addressed in versions 4.4.0-203.235, 4.15.0-136.140, 5.4.0-66.74
linux-raspi2 (Ubuntu package) - addressed in versions 4.4.0-1146.156, 4.15.0-1079.84
linux-lts-xenial (Ubuntu package) - update to 4.4.0-203.235~14.04.1
linux-aws (Ubuntu package) - addressed in versions 4.4.0-1086.90, 4.4.0-1122.136, 4.15.0-1094.101, 5.4.0-1038.40
linux-kvm (Ubuntu package) - addressed in versions 4.4.0-1088.97, 4.15.0-1085.87, 5.4.0-1033.34
linux-snapdragon (Ubuntu package) - addressed in versions 4.4.0-1150.160, 4.15.0-1096.105
linux-hwe (Ubuntu package) - update to 4.15.0-136.140~16.04.1
linux-gcp (Ubuntu package) - addressed in versions 4.15.0-1093.106~16.04.1, 5.4.0-1037.40
linux-azure (Ubuntu package) - addressed in versions 4.15.0-1108.120~14.04.1, 4.15.0-1108.120~16.04.1, 5.4.0-1040.42
linux-oracle (Ubuntu package) - addressed in versions 4.15.0-1065.73~16.04.1, 4.15.0-1065.73, 5.4.0-1038.41
linux-gke-4.15 (Ubuntu package) - update to 4.15.0-1079.84
linux-aws-hwe (Ubuntu package) - update to 4.15.0-1094.101~16.04.1
linux-azure-4.15 (Ubuntu package) - update to 4.15.0-1108.120
linux-gcp-4.15 (Ubuntu package) - update to 4.15.0-1093.106
linux-hwe-5.4 (Ubuntu package) - update to 5.4.0-66.74~18.04.2
linux-gke-5.4 (Ubuntu package) - update to 5.4.0-1036.38~18.04.1
linux-gkeop-5.4 (Ubuntu package) - update to 5.4.0-1010.11~18.04.1
linux-gkeop (Ubuntu package) - update to 5.4.0-1010.11
linux-raspi (Ubuntu package) - update to 5.4.0-1029.32
linux-aws-5.4 (Ubuntu package) - update to 5.4.0-1038.40~18.04.1
linux-azure-5.4 (Ubuntu package) - update to 5.4.0-1040.42~18.04.1
linux-oracle-5.4 (Ubuntu package) - update to 5.4.0-1038.41~18.04.1
linux-gcp-5.4 (Ubuntu package) - update to 5.4.0-1037.40~18.04.1
linux-raspi-5.4 (Ubuntu package) - update to 5.4.0-1029.32~18.04.1
kernel - update to 4.14.214-118.339
kernel - update to 4.19.90-2102.2.0.0057
bpftool - update to 4.19.90-2102.2.0.0057
kernel-debugsource - update to 4.19.90-2102.2.0.0057
kernel-tools - update to 4.19.90-2102.2.0.0057
kernel-debuginfo - update to 4.19.90-2102.2.0.0057
perf-debuginfo - update to 4.19.90-2102.2.0.0057
python3-perf-debuginfo - update to 4.19.90-2102.2.0.0057
python2-perf - update to 4.19.90-2102.2.0.0057
python3-perf - update to 4.19.90-2102.2.0.0057
bpftool-debuginfo - update to 4.19.90-2102.2.0.0057
kernel-tools-devel - update to 4.19.90-2102.2.0.0057
kernel-devel - update to 4.19.90-2102.2.0.0057
kernel-tools-debuginfo - update to 4.19.90-2102.2.0.0057
python2-perf-debuginfo - update to 4.19.90-2102.2.0.0057
kernel-source - update to 4.19.90-2102.2.0.0057
perf - update to 4.19.90-2102.2.0.0057
linux-image-5.8.0-44-generic-lpae (Ubuntu package) - update to 5.8.0-44.50~20.04.1
linux-image-5.8.0-44-lowlatency (Ubuntu package) - update to 5.8.0-44.50~20.04.1
linux-image-5.8.0-44-generic (Ubuntu package) - update to 5.8.0-44.50~20.04.1
linux-image-5.8.0-44-generic-64k (Ubuntu package) - update to 5.8.0-44.50
linux-image-5.8.0-1016-raspi-nolpae (Ubuntu package) - update to 5.8.0-1016.19
linux-image-5.8.0-1016-raspi (Ubuntu package) - update to 5.8.0-1016.19
linux-image-5.8.0-1019-kvm (Ubuntu package) - update to 5.8.0-1019.21
linux-image-5.8.0-1021-oracle (Ubuntu package) - update to 5.8.0-1021.22
linux-image-5.8.0-1023-gcp (Ubuntu package) - update to 5.8.0-1023.24
linux-image-5.8.0-1023-azure (Ubuntu package) - update to 5.8.0-1023.25
linux-image-5.8.0-1024-aws (Ubuntu package) - update to 5.8.0-1024.26
linux-image-lowlatency (Ubuntu package) - update to 5.8.0.44.49
linux-image-virtual (Ubuntu package) - update to 5.8.0.44.49
linux-image-oem-20.04 (Ubuntu package) - update to 5.8.0.44.49
linux-image-generic-lpae (Ubuntu package) - update to 5.8.0.44.49
linux-image-generic-64k (Ubuntu package) - update to 5.8.0.44.49
linux-image-generic (Ubuntu package) - update to 5.8.0.44.49
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-raspi-nolpae (Ubuntu package) - update to 5.8.0.1016.19
linux-image-raspi (Ubuntu package) - update to 5.8.0.1016.19
linux-image-kvm (Ubuntu package) - update to 5.8.0.1019.21
linux-image-oracle (Ubuntu package) - update to 5.8.0.1021.20
linux-image-gke (Ubuntu package) - update to 5.8.0.1023.23
linux-image-gcp (Ubuntu package) - update to 5.8.0.1023.23
linux-image-azure (Ubuntu package) - update to 5.8.0.1023.23
linux-image-aws (Ubuntu package) - update to 5.8.0.1024.26
linux-raspi2 (Ubuntu package) - addressed in versions 4.4.0-1146.156, 4.15.0-1079.84
linux-lts-xenial (Ubuntu package) - update to 4.4.0-203.235~14.04.1
linux-aws (Ubuntu package) - addressed in versions 4.4.0-1086.90, 4.4.0-1122.136, 4.15.0-1094.101, 5.4.0-1038.40
linux-kvm (Ubuntu package) - addressed in versions 4.4.0-1088.97, 4.15.0-1085.87, 5.4.0-1033.34
linux-snapdragon (Ubuntu package) - addressed in versions 4.4.0-1150.160, 4.15.0-1096.105
linux-hwe (Ubuntu package) - update to 4.15.0-136.140~16.04.1
linux-gcp (Ubuntu package) - addressed in versions 4.15.0-1093.106~16.04.1, 5.4.0-1037.40
linux-azure (Ubuntu package) - addressed in versions 4.15.0-1108.120~14.04.1, 4.15.0-1108.120~16.04.1, 5.4.0-1040.42
linux-oracle (Ubuntu package) - addressed in versions 4.15.0-1065.73~16.04.1, 4.15.0-1065.73, 5.4.0-1038.41
linux-gke-4.15 (Ubuntu package) - update to 4.15.0-1079.84
linux-aws-hwe (Ubuntu package) - update to 4.15.0-1094.101~16.04.1
linux-azure-4.15 (Ubuntu package) - update to 4.15.0-1108.120
linux-gcp-4.15 (Ubuntu package) - update to 4.15.0-1093.106
linux-hwe-5.4 (Ubuntu package) - update to 5.4.0-66.74~18.04.2
linux-gke-5.4 (Ubuntu package) - update to 5.4.0-1036.38~18.04.1
linux-gkeop-5.4 (Ubuntu package) - update to 5.4.0-1010.11~18.04.1
linux-gkeop (Ubuntu package) - update to 5.4.0-1010.11
linux-raspi (Ubuntu package) - update to 5.4.0-1029.32
linux-aws-5.4 (Ubuntu package) - update to 5.4.0-1038.40~18.04.1
linux-azure-5.4 (Ubuntu package) - update to 5.4.0-1040.42~18.04.1
linux-oracle-5.4 (Ubuntu package) - update to 5.4.0-1038.41~18.04.1
linux-gcp-5.4 (Ubuntu package) - update to 5.4.0-1037.40~18.04.1
linux-raspi-5.4 (Ubuntu package) - update to 5.4.0-1029.32~18.04.1
kernel - update to 4.14.214-118.339
kernel - update to 4.19.90-2102.2.0.0057
bpftool - update to 4.19.90-2102.2.0.0057
kernel-debugsource - update to 4.19.90-2102.2.0.0057
kernel-tools - update to 4.19.90-2102.2.0.0057
kernel-debuginfo - update to 4.19.90-2102.2.0.0057
perf-debuginfo - update to 4.19.90-2102.2.0.0057
python3-perf-debuginfo - update to 4.19.90-2102.2.0.0057
python2-perf - update to 4.19.90-2102.2.0.0057
python3-perf - update to 4.19.90-2102.2.0.0057
bpftool-debuginfo - update to 4.19.90-2102.2.0.0057
kernel-tools-devel - update to 4.19.90-2102.2.0.0057
kernel-devel - update to 4.19.90-2102.2.0.0057
kernel-tools-debuginfo - update to 4.19.90-2102.2.0.0057
python2-perf-debuginfo - update to 4.19.90-2102.2.0.0057
kernel-source - update to 4.19.90-2102.2.0.0057
perf - update to 4.19.90-2102.2.0.0057
linux-image-5.8.0-44-generic-lpae (Ubuntu package) - update to 5.8.0-44.50~20.04.1
linux-image-5.8.0-44-lowlatency (Ubuntu package) - update to 5.8.0-44.50~20.04.1
linux-image-5.8.0-44-generic (Ubuntu package) - update to 5.8.0-44.50~20.04.1
linux-image-5.8.0-44-generic-64k (Ubuntu package) - update to 5.8.0-44.50
linux-image-5.8.0-1016-raspi-nolpae (Ubuntu package) - update to 5.8.0-1016.19
linux-image-5.8.0-1016-raspi (Ubuntu package) - update to 5.8.0-1016.19
linux-image-5.8.0-1019-kvm (Ubuntu package) - update to 5.8.0-1019.21
linux-image-5.8.0-1021-oracle (Ubuntu package) - update to 5.8.0-1021.22
linux-image-5.8.0-1023-gcp (Ubuntu package) - update to 5.8.0-1023.24
linux-image-5.8.0-1023-azure (Ubuntu package) - update to 5.8.0-1023.25
linux-image-5.8.0-1024-aws (Ubuntu package) - update to 5.8.0-1024.26
linux-image-lowlatency (Ubuntu package) - update to 5.8.0.44.49
linux-image-virtual (Ubuntu package) - update to 5.8.0.44.49
linux-image-oem-20.04 (Ubuntu package) - update to 5.8.0.44.49
linux-image-generic-lpae (Ubuntu package) - update to 5.8.0.44.49
linux-image-generic-64k (Ubuntu package) - update to 5.8.0.44.49
linux-image-generic (Ubuntu package) - update to 5.8.0.44.49
linux-image-generic-lpae-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-generic-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-generic-64k-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-lowlatency-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-virtual-hwe-20.04 (Ubuntu package) - update to 5.8.0.44.50~20.04.30
linux-image-raspi-nolpae (Ubuntu package) - update to 5.8.0.1016.19
linux-image-raspi (Ubuntu package) - update to 5.8.0.1016.19
linux-image-kvm (Ubuntu package) - update to 5.8.0.1019.21
linux-image-oracle (Ubuntu package) - update to 5.8.0.1021.20
linux-image-gke (Ubuntu package) - update to 5.8.0.1023.23
linux-image-gcp (Ubuntu package) - update to 5.8.0.1023.23
linux-image-azure (Ubuntu package) - update to 5.8.0.1023.23
linux-image-aws (Ubuntu package) - update to 5.8.0.1024.26