NetSight
IP …
high8.8

CVE-2020-29569

An issue was discovered in the Linux kernel through 5.10.1, as used with Xen through 4.14.x.

Impact

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 products

VendorProductAffected versions
XenXen
through 4.14.1
LinuxLinux Kernel
from 4.1.44 before 4.2
from 4.4.80 before 4.4.254
from 4.9.36 before 4.9.249
from 4.11.9 before 4.12
from 4.12 before 4.14.213
from 4.15 before 4.19.164
NetappHci Compute Node Bios
All versions
NetappSolidfire \& Hci Management Node
All versions
NetappSolidfire \& Hci Storage Node
All versions
DebianDebian Linux
Versions 9.0, 10.0

Weakness classification

CWE-416

References