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Fencer Vulns
high 7.5

CVE-2016-9381 json

Race condition in QEMU in Xen allows local x86 HVM guest OS administrators to gain privileges by changing certain data on shared rings, aka…

published 2017-01-23 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-10191

cvss
7.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

Race condition in QEMU in Xen allows local x86 HVM guest OS administrators to gain privileges by changing certain data on shared rings, aka a "double fetch" vulnerability.

Patch / fix

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

debian advisories DEBIAN-CVE-2016-9381

  • xen Ubuntu 14.04 LTS 4.4.2-0ubuntu0.14.04.9
  • qemu Ubuntu 14.04 LTS 2.0.0+dfsg-2ubuntu1.33
  • qemu Ubuntu 16.04 LTS 1:2.5+dfsg-5ubuntu10.11

ubuntu advisories UBUNTU-CVE-2016-9381

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

  • qemu SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +1 more 2.6.2-39.1
  • 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-2017:0127-1SUSE-SU-2016:3273-1SUSE-SU-2016:3174-1SUSE-SU-2016:3156-1SUSE-SU-2016:3083-1SUSE-SU-2016:3067-1

  • xen openSUSE Tumbleweed 4.15.1_01-1.2

opensuse advisories openSUSE-SU-2024:11520-1

  • xen Alpine 3.24, Alpine 3.23, Alpine 3.22 +17 more 4.7.1-r1

alpine advisories ALPINE-CVE-2016-9381

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2016-9381 updated cvss 7.5

xen: qemu incautious about shared ring processing (XSA-197)

  • Red Hat Enterprise Linux 5 kvm, xen Red Hat Enterprise Linux 6 qemu-img, qemu-kvm, qemu-kvm-rhev, 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
    +1 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
    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

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 7.5 CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H
NVD 2.0 6.9 AV:L/AC:M/Au:N/C:C/I:C/A:C

Classification

Weakness
  • CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization

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.