What’s Vulnerable › Vulnerabilities

CVE-2013-6424

• Severity: medium (CVSS 5.0 v2.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.9% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2014-01-18 · updated 2026-06-17
• Weakness: CWE-191

Description

Integer underflow in the xTrapezoidValid macro in render/picture.h in X.Org allows context-dependent attackers to cause a denial of service (crash) via a negative bottom value.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 14.10
• Debian Linux: 6.0, 7.0
• Opensuse: 12.2, 12.3, 13.1
• The pixman Project pixman: before 0.31.2 — fixed in 0.31.2

How to fix

Upgrade to a fixed version: The pixman Project pixman 0.31.2. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-updates/2013-12/msg00127.html
• http://lists.x.org/archives/xorg-devel/2013-October/037996.html
• http://rhn.redhat.com/errata/RHSA-2013-1868.html
• http://www.debian.org/security/2013/dsa-2822
• http://www.openwall.com/lists/oss-security/2013/12/03/8
• http://www.openwall.com/lists/oss-security/2013/12/04/8
• http://www.ubuntu.com/usn/USN-2500-1
• https://bugs.freedesktop.org/show_bug.cgi?id=67484
• https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1197921
• https://security.gentoo.org/glsa/201701-64
• https://security.gentoo.org/glsa/201710-30
• http://lists.opensuse.org/opensuse-updates/2013-12/msg00127.html

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