CVE-2020-15852: Linux Kernel

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

An issue was discovered in the Linux kernel 5.5 through 5.7.9, as used in Xen through 4.13.x for x86 PV guests. An attacker may be granted the I/O port permissions of an unrelated task. This occurs because tss_invalidate_io_bitmap mishandling causes a loss of synchronization between the I/O bitmaps of TSS and Xen, aka CID-cadfad870154.

Affected products

• Linux Linux Kernel: from 5.5, up to and including 5.7.9
• Netapp Cloud Backup: affected versions not specified
• Netapp Solidfire Baseboard Management Controller: affected versions not specified
• Netapp Steelstore Cloud Integrated Storage: affected versions not specified
• Xen Xen: up to and including 4.13.1

Published 2020-07-20. Last modified 2026-06-17.