CVE-2020-29569

Fixed in a distro release EPSS <1%

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.

Published 2020-12-15 · CVE record · OSV

Products: xen, linux_kernel, netapp hci_compute_node_bios, netapp solidfire_&_hci_management_node, netapp solidfire_&_hci_storage_node, debian_linux

Distro releases