cbcvebase.
CVE-2020-25601
published 2020-09-23

CVE-2020-25601: An issue was discovered in Xen through 4.14.x. There is a lack of preemption in evtchn_reset() / evtchn_destroy(). In particular, the FIFO event channel model…

PriorityP421medium5.5CVSS 3.1
AVLACLPRLUINSUCNINAH
EPSS
0.42%
34.4th percentile
An issue was discovered in Xen through 4.14.x. There is a lack of preemption in evtchn_reset() / evtchn_destroy(). In particular, the FIFO event channel model allows guests to have a large number of event channels active at a time. Closing all of these (when resetting all event channels or when cleaning up after the guest) may take extended periods of time. So far, there was no arrangement for preemption at suitable intervals, allowing a CPU to spend an almost unbounded amount of time in the processing of these operations. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. All Xen versions are vulnerable in principle. Whether versions 4.3 and older are vulnerable depends on underlying hardware characteristics.

Affected

12 ranges
VendorProductVersion rangeFixed in
debiandebian_linux
debianxen< xen 4.14.0+80-gd101b417b7-1 (bookworm)xen 4.14.0+80-gd101b417b7-1 (bookworm)
fedoraprojectfedora
fedoraprojectfedora
fedoraprojectfedora
opensuseleap
xenxen<= 4.14.0
xenxen>= 0 < 4.14.0+80-gd101b417b7-14.14.0+80-gd101b417b7-1
xenxen>= 0 < 4.14.0+80-gd101b417b7-14.14.0+80-gd101b417b7-1
xenxen>= 0 < 4.14.0+80-gd101b417b7-14.14.0+80-gd101b417b7-1
xenxen>= 0 < 4.14.0+80-gd101b417b7-14.14.0+80-gd101b417b7-1
xenxen>= 0 < 4.11.3+24-g14b62ab3e5-1ubuntu2.34.11.3+24-g14b62ab3e5-1ubuntu2.3

CVSS provenance

nvdv3.15.5MEDIUMCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvdv2.04.9MEDIUMAV:L/AC:L/Au:N/C:N/I:N/A:C
osv5.5MEDIUM
vendor_debian5.5MEDIUM
vendor_redhat5.5MEDIUM
vendor_ubuntu5.5MEDIUM
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