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Fencer Vulns
high 7.5

CVE-2016-9637 json

The (1) ioport_read and (2) ioport_write functions in Xen, when qemu is used as a device model within Xen, might allow local x86 HVM guest…

published 2017-02-16 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10439

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

The (1) ioport_read and (2) ioport_write functions in Xen, when qemu is used as a device model within Xen, might allow local x86 HVM guest OS administrators to gain qemu process privileges via vectors involving an out-of-range ioport access.

Patch / fix

  • xen Debian 14, Debian 13, Debian 12 4.4.0-1

debian advisories DEBIAN-CVE-2016-9637

  • xen Ubuntu 14.04 LTS 4.4.2-0ubuntu0.14.04.9

ubuntu advisories UBUNTU-CVE-2016-9637

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • xen RHEL 5 VIRTUALIZATION, RHEL 5 3.0.3-148.el5_11
  • xen-libs RHEL 5 3.0.3-148.el5_11

red hat advisories RHSA-2016:2963

  • xen SLES 11 SP3-LTSS, SLE Point of Sale 11 SP3, OpenStack Cloud 5 +2 more 4.2.5_21-30.1
  • xen SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 4.4.4_10-43.5
  • xen SLES for SAP 12 SP1, SLES 12 SP1, SLED 12 SP1 +1 more 4.5.5_02-22.3.1
  • xen SLES for SAP 12 SP2, SLES 12 SP2, SLED 12 SP2 +1 more 4.7.1_02-25.1
  • xen SLES for SAP 12, SLES 12-LTSS 4.4.4_05-22.25.1
  • xen SLES 11 SP2-LTSS 4.1.6_08-32.1

suse advisories SUSE-SU-2016:3273-1SUSE-SU-2016:3174-1SUSE-SU-2016:3156-1SUSE-SU-2016:3083-1SUSE-SU-2016:3067-1SUSE-SU-2016:3044-1

  • xen openSUSE Tumbleweed 4.15.1_01-1.2

opensuse advisories openSUSE-SU-2024:11520-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2016-9637 updated cvss 7.6

Xen: qemu ioport out-of-bounds array access (XSA-199)

  • Red Hat Enterprise Linux (v. 5 server) xen 3.0.3-148.el5_11, xen-libs 3.0.3-148.el5_11 Red Hat Enterprise Linux Desktop (v. 5 client) xen 3.0.3-148.el5_11, xen-libs 3.0.3-148.el5_11 Red Hat Enterprise Linux Desktop Multi OS (v. 5 client) xen 3.0.3-148.el5_11 Red Hat Enterprise Linux Virtualization (v. 5 server) xen 3.0.3-148.el5_11
    fixed: vendor fix RHSA-2016:2963
  • Red Hat Enterprise Linux 5 kvm Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-tools, qemu-guest-agent, qemu-guest-agent-win32 Red Hat Enterprise Linux 7 qemu-img, qemu-kvm, libcacard, qemu-kvm-rhev, qemu-kvm-tools, libcacard-tools, +2 more Red Hat Enterprise Linux OpenStack Platform 5 (Icehouse) qemu-kvm-rhev Red Hat Enterprise Linux OpenStack Platform 6 (Juno) qemu-kvm-rhev Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) qemu-img-rhev, qemu-kvm-rhev, libcacard-rhev, qemu-kvm-tools-rhev, libcacard-devel-rhev, libcacard-tools-rhev, +1 more
    +2 more products
    Red Hat OpenStack Platform 8 (Liberty) qemu-img-rhev, qemu-kvm-rhev, libcacard-rhev, qemu-kvm-tools-rhev, libcacard-devel-rhev, libcacard-tools-rhev, +1 more Red Hat OpenStack Platform 9 (Mitaka) qemu-img-rhev, qemu-kvm-rhev, libcacard-rhev, qemu-kvm-tools-rhev, libcacard-devel-rhev, libcacard-tools-rhev, +1 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 3.7 AV:L/AC:H/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-264 Permissions, Privileges, and Access Controls

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.