cbcvebase.
CVE-2020-29571
published 2020-12-15

CVE-2020-29571: An issue was discovered in Xen through 4.14.x. A bounds check common to most operation time functions specific to FIFO event channels depends on the CPU…

PriorityP422medium6.2CVSS 3.1
AVLACLPRNUINSUCNINAH
EPSS
0.38%
30.5th percentile
An issue was discovered in Xen through 4.14.x. A bounds check common to most operation time functions specific to FIFO event channels depends on the CPU observing consistent state. While the producer side uses appropriately ordered writes, the consumer side isn't protected against re-ordered reads, and may hence end up de-referencing a NULL pointer. Malicious or buggy guest kernels can mount a Denial of Service (DoS) attack affecting the entire system. Only Arm systems may be vulnerable. Whether a system is vulnerable depends on the specific CPU. x86 systems are not vulnerable.

Affected

9 ranges
VendorProductVersion rangeFixed in
debiandebian_linux——
debianxen< xen 4.14.0+88-g1d1d1f5391-1 (bookworm)xen 4.14.0+88-g1d1d1f5391-1 (bookworm)
fedoraprojectfedora——
fedoraprojectfedora——
xenxen>= 0 < 4.14.0+88-g1d1d1f5391-14.14.0+88-g1d1d1f5391-1
xenxen>= 0 < 4.14.0+88-g1d1d1f5391-14.14.0+88-g1d1d1f5391-1
xenxen>= 0 < 4.14.0+88-g1d1d1f5391-14.14.0+88-g1d1d1f5391-1
xenxen>= 0 < 4.14.0+88-g1d1d1f5391-14.14.0+88-g1d1d1f5391-1
xenxen4.4.0 – 4.14.0—

CVSS provenance

nvdv3.16.2MEDIUMCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvdv2.04.9MEDIUMAV:L/AC:L/Au:N/C:N/I:N/A:C
osv6.2MEDIUM
vendor_debian6.2MEDIUM
Stop checking back — get the weekly exploitation signal.

Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.