Skip to content
Fencer Vulns
critical 9.8

CVE-2016-7944 json

Integer overflow in X.org libXfixes before 5.0.3 on 32-bit platforms might allow remote X servers to gain privileges via a length value of…

published 2016-12-13 9 y ago modified 2026-06-17 4 mo ago also EUVD-2016-8793

cvss
9.8
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.4%
EPSS 3.4% chance of exploitation in 30 days, percentile 88%
public exploits
0
none known

Summary

Integer overflow in X.org libXfixes before 5.0.3 on 32-bit platforms might allow remote X servers to gain privileges via a length value of INT_MAX, which triggers the client to stop reading data and get out of sync.

Patch / fix

  • libxfixes Debian 14, Debian 13, Debian 12 1:5.0.3-1

debian advisories DEBIAN-CVE-2016-7944

  • libxfixes Ubuntu 20.04 LTS, Ubuntu 18.04 LTS 1:5.0.3-1
  • libxfixes Ubuntu Pro 16.04 LTS 1:5.0.1-2ubuntu0.1~esm1

ubuntu advisories UBUNTU-CVE-2016-7944

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

  • xorg-x11-libXfixes SLES for SAP 11 SP4, SLES 11 SP4, SLE Software Development Kit 11 SP4 7.4-1.20.1
  • libXi SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.7.4-14.1
  • libXv SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.0.10-7.1
  • libX11 SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.6.2-8.1
  • libXtst SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.2.2-7.1
  • libXvMC SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 1.0.8-7.1
  • libXfixes SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 5.0.1-7.1
  • libXrender SLES for SAP 12 SP2, SLES for Raspberry Pi 12 SP2, SLES 12 SP2 +2 more 0.9.8-7.1

suse advisories SUSE-SU-2016:3172-1SUSE-SU-2016:2828-1SUSE-SU-2016:2505-1

  • libxfixes Alpine 3.2 5.0.1-r1
  • libxfixes Alpine 3.3 5.0.1-r2

alpine advisories ALPINE-CVE-2016-7944

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-2016-7944 updated cvss 4.2

libXfixes: Insufficient validation of server responses results in Integer overflow

  • Red Hat Enterprise Linux 5 libXfixes Red Hat Enterprise Linux 6 libXfixes Red Hat Enterprise Linux 7 libXfixes
    affected: no fix planned “Will not fix”

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

3.40% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.0 9.8 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound
  • 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.