CVE-2016-3157: Canonical Ubuntu Linux
High severity, CVSS 7.8. EPSS: 0.5% chance of exploitation in the next 30 days.
The __switch_to function in arch/x86/kernel/process_64.c in the Linux kernel does not properly context-switch IOPL on 64-bit PV Xen guests, which allows local guest OS users to gain privileges, cause a denial of service (guest OS crash), or obtain sensitive information by leveraging I/O port access.
Affected products
Published 2016-04-12. Last modified 2026-06-17.