What is CVE-2016-1570?

CVE-2016-1570 is a high-severity vulnerability in Xen, classified under Improper Input Validation. CVSS score: 8.5/10. Published 2016-01-22.

How severe is CVE-2016-1570?

High severity. CVSS v3 base score is 8.5 out of 10.

Improper input validation in Xen

CVE-2016-1570

The PV superpage functionality in arch/x86/mm.c in Xen 3.4.0, 3.4.1, and 4.1.x through 4.6.x allows local PV guests to obtain sensitive information, cause a denial of service, gain privileges, or have unspecified other impact via a crafted page identifier (MFN) to the (1) MMUEXT_MARK_SUPER or (2) MMUEXT_UNMARK_SUPER sub-op in the HYPERVISOR_mmuext_op hypercall or (3) unknown vectors related to page table updates.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2016-01-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.5 (High). Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (65.7th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 65.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Xen — versions 3.4.0, 3.4.1, 4.1.0

Weakness classification (CWE)

CWE-20 — Improper Input Validation

References

www.debian.org/security/2016/dsa-3519 (vendor-advisory)
www.securitytracker.com/id/1034744 (vdb-entry)
xenbits.xen.org/xsa/advisory-167.html (Vendor Advisory)

Frequently asked questions

What is CVE-2016-1570?: CVE-2016-1570 is a high-severity vulnerability in Xen, classified under Improper Input Validation. CVSS score: 8.5/10. Published 2016-01-22.
How severe is CVE-2016-1570?: High severity. CVSS v3 base score is 8.5 out of 10.